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//ij
ict.
ia
esco
r
e.
co
m
Clo
ud com
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surv
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on serv
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s, enhancem
ents
a
nd
cha
lleng
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he
era o
f
ma
chine
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rning
and da
ta s
cience
Wa
j
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a
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o
hn
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a
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rick
Appi
a
h
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ub
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lia
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6
1
In
d
ian
a
S
tate
Un
i
v
e
rsity
,
Terre
Ha
u
te,
In
d
ian
a
2,
4,
6
Eas
t
Ca
ro
l
in
a
Un
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rsity
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G
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e
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v
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le,
N
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Ca
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Ca
lP
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Ca
li
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Un
iv
e
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o
f
M
a
ry
lan
d
Un
iv
e
rsi
ty
Co
ll
e
g
e
,
Lar
g
o
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M
a
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Art
icle
I
nfo
AB
S
T
RAC
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A
r
ticle
his
to
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y:
R
ec
eiv
ed
Oct
2
,
2
0
19
R
ev
is
ed
No
v
13
,
2
0
20
Acc
ep
ted
Feb
19
,
2
0
20
Clo
u
d
c
o
m
p
u
ti
n
g
h
a
s
sw
e
e
p
in
g
i
m
p
a
c
t
o
n
th
e
h
u
m
a
n
p
ro
d
u
c
ti
v
it
y
.
To
d
a
y
it
’s
u
se
d
fo
r
Co
m
p
u
ti
n
g
,
S
to
ra
g
e
,
P
r
e
d
ictio
n
s
a
n
d
I
n
telli
g
e
n
t
De
c
isio
n
M
a
k
i
n
g
,
a
m
o
n
g
o
t
h
e
rs.
I
n
telli
g
e
n
t
De
c
is
io
n
-
M
a
k
in
g
u
sin
g
M
a
c
h
in
e
Lea
rn
in
g
h
a
s
p
u
sh
e
d
fo
r
th
e
Clo
u
d
S
e
r
v
ice
s
to
b
e
e
v
e
n
m
o
re
fa
st,
ro
b
u
st
a
n
d
a
c
c
u
ra
te.
S
e
c
u
rit
y
re
m
a
in
s o
n
e
o
f
th
e
m
a
jo
r
c
o
n
c
e
rn
s wh
ich
a
ffe
c
t
th
e
c
lo
u
d
c
o
m
p
u
ti
n
g
g
ro
wt
h
h
o
we
v
e
r
th
e
re
e
x
ist
v
a
rio
u
s
re
se
a
rc
h
c
h
a
ll
e
n
g
e
s
i
n
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l
o
u
d
c
o
m
p
u
ti
n
g
a
d
o
p
t
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su
c
h
a
s
lac
k
o
f
we
ll
m
a
n
a
g
e
d
se
rv
ice
lev
e
l
a
g
re
e
m
e
n
t
(S
LA),
fre
q
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e
n
t
d
isc
o
n
n
e
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ti
o
n
s,
re
so
u
r
c
e
sc
a
rc
it
y
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ter
o
p
e
ra
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il
it
y
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p
ri
v
a
c
y
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a
n
d
re
li
a
b
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it
y
.
Trem
e
n
d
o
u
s
a
m
o
u
n
t
o
f
wo
rk
stil
l
n
e
e
d
s
t
o
b
e
d
o
n
e
t
o
e
x
p
l
o
re
th
e
se
c
u
rit
y
c
h
a
ll
e
n
g
e
s
a
risin
g
d
u
e
t
o
wid
e
s
p
re
a
d
u
sa
g
e
o
f
c
l
o
u
d
d
e
p
lo
y
m
e
n
t
u
sin
g
Co
n
tain
e
rs.
We
a
lso
d
isc
u
ss
Im
p
a
c
t
o
f
Clo
u
d
C
o
m
p
u
ti
n
g
a
n
d
Clo
u
d
S
tan
d
a
rd
s.
He
n
c
e
in
th
is
re
se
a
rc
h
p
a
p
e
r,
a
d
e
tailed
su
rv
e
y
o
f
c
lo
u
d
c
o
m
p
u
ti
n
g
,
c
o
n
c
e
p
ts,
a
rc
h
it
e
c
tu
ra
l
p
rin
c
i
p
les
,
k
e
y
se
rv
ice
s,
a
n
d
imp
lem
e
n
tatio
n
,
d
e
sig
n
a
n
d
d
e
p
lo
y
m
e
n
t
c
h
a
ll
e
n
g
e
s
o
f
c
lo
u
d
c
o
m
p
u
ti
n
g
a
re
d
isc
u
ss
e
d
i
n
d
e
tail
a
n
d
imp
o
rtan
t
fu
t
u
re
re
se
a
rc
h
d
irec
ti
o
n
s
in
th
e
e
ra
o
f
M
a
c
h
in
e
Lea
rn
in
g
a
n
d
Da
ta
S
c
ien
c
e
h
a
v
e
b
e
e
n
id
e
n
t
ifi
e
d
.
K
ey
w
o
r
d
s
:
C
lo
u
d
au
to
m
atio
n
C
lo
u
d
co
m
p
u
tin
g
C
lo
u
d
s
ec
u
r
ity
Ma
ch
in
e
lear
n
i
ng
Qu
an
tu
m
co
m
p
u
tin
g
So
f
twar
e
d
ef
in
ed
n
etwo
r
k
i
n
g
T
h
is i
s
a
n
o
p
e
n
a
c
c
e
ss
a
rticle
u
n
d
e
r th
e
CC B
Y
-
SA
li
c
e
n
se
.
C
o
r
r
e
s
p
o
nd
ing
A
uth
o
r
:
W
ajid
Has
s
an
,
I
n
d
ian
a
State
Un
iv
er
s
ity
,
T
er
r
e
Hau
te,
I
n
d
ian
a
,
USA
.
E
m
ail:
wajid
h
ass
an
@
y
ah
o
o
.
co
m
1.
I
NT
RO
D
UCT
I
O
N
As
s
tated
b
y
th
e
I
E
E
E
C
o
m
p
u
tin
g
Or
g
an
izatio
n
,
“T
h
e
g
o
a
l
o
f
c
o
m
p
u
tin
g
s
er
v
ices
is
to
en
ab
le
I
T
s
er
v
ices
an
d
c
o
m
p
u
tin
g
tec
h
n
o
lo
g
y
to
p
er
f
o
r
m
b
u
s
in
ess
s
er
v
ices
m
o
r
e
ef
f
icien
tly
an
d
ef
f
e
ctiv
ely
.
”
NI
ST,
T
h
e
Natio
n
al
I
n
s
titu
te
o
f
Stan
d
ar
d
s
an
d
T
ec
h
n
o
lo
g
y
s
u
g
g
ests
[
1
,
2
]
th
at
m
o
d
els
o
f
clo
u
d
co
m
p
u
tin
g
ar
e
“c
o
m
p
o
s
ed
o
f
f
iv
e
ess
en
tial
ch
ar
ac
ter
is
tic
s
.
”
Me
ll
an
d
Gr
ac
e
t
h
e
ch
ar
ac
ter
is
tics
ar
e:
s
er
v
ice
m
ea
s
u
r
ab
ilit
y
,
b
r
o
ad
n
etwo
r
k
ac
ce
s
s
,
r
es
o
u
r
ce
p
o
o
lin
g
,
r
ap
i
d
elasticity
an
d
o
n
-
d
em
a
n
d
s
elf
-
s
er
v
ice.
E
ac
h
o
f
th
ese
asp
ec
ts
is
v
er
y
im
p
o
r
tan
t
to
th
e
C
lo
u
d
T
ec
h
n
o
lo
g
y
.
C
lo
u
d
co
m
p
u
tin
g
s
er
v
ice
f
ea
t
u
r
es
ar
e
s
h
o
wn
in
Fig
u
r
e
1
an
d
will
b
e
d
is
cu
s
s
ed
in
th
e
p
ap
er
later
.
T
h
er
e
is
m
ass
iv
e
i
n
f
o
r
m
atio
n
o
n
th
e
C
lo
u
d
C
o
m
p
u
tin
g
in
ter
m
s
o
f
r
esear
ch
p
a
p
er
s
,
wh
ite
p
ap
er
s
,
b
lo
g
s
an
d
ar
ticles
th
at
all
th
e
i
n
f
o
r
m
atio
n
ca
n
n
o
t
b
e
co
v
er
ed
in
o
n
e
p
ap
er
.
Hen
ce
,
th
is
s
u
r
v
ey
p
ap
er
p
r
o
v
id
e
s
an
in
-
d
e
p
th
k
n
o
wled
g
e
o
f
a
f
ew
r
esear
ch
p
ap
e
r
s
,
r
ath
er
th
an
wid
e
r
an
g
e
o
f
p
a
p
er
s
with
s
h
allo
w
co
v
er
a
g
e.
T
h
er
ef
o
r
e,
th
is
s
u
r
v
ey
o
f
f
e
r
s
r
ea
d
er
s
a
f
air
u
n
d
er
s
tan
d
i
n
g
o
n
th
e
p
ast,
p
r
esen
t a
n
d
f
u
tu
r
e
o
f
C
lo
u
d
C
o
m
p
u
tin
g
.
C
lo
u
d
co
m
p
u
tin
g
o
f
f
er
s
a
n
u
m
b
er
o
f
d
ep
lo
y
m
en
t
m
o
d
els,
ea
ch
o
f
th
e
m
o
d
els
h
as
its
p
r
o
s
an
d
co
n
s
.
A
b
r
ief
co
m
p
ar
is
o
n
o
f
th
e
c
o
m
p
u
tin
g
lay
er
s
is
g
iv
en
b
elo
w.
Evaluation Warning : The document was created with Spire.PDF for Python.
I
SS
N
:
2
2
5
2
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I
n
t J I
n
f
&
C
o
m
m
u
n
T
ec
h
n
o
l
,
Vo
l.
9
,
No
.
2,
Au
g
u
s
t
20
20
:
1
1
7
–
139
118
T
h
e
im
p
ac
t
o
f
C
lo
u
d
co
m
p
u
tin
g
is
en
o
r
m
o
u
s
;
with
clo
u
d
c
o
m
p
u
tin
g
s
m
all
b
u
s
in
ess
es
ca
n
g
o
g
lo
b
a
l
v
er
y
ea
s
ily
.
De
v
elo
p
in
g
co
u
n
t
r
ies
h
av
e
alr
ea
d
y
s
h
o
wn
th
e
p
o
ten
tial
o
f
n
ew
m
ar
k
ets
an
d
h
av
e
em
er
g
ed
as n
ew
co
m
p
etito
r
s
.
C
lo
u
d
co
m
p
u
t
in
g
g
iv
es
co
m
p
an
ies
an
d
in
d
iv
id
u
als
s
m
ar
ter
way
s
to
d
ev
elo
p
p
r
o
d
u
cts,
co
llab
o
r
ate
an
d
test
id
ea
s
c
h
ea
p
ly
an
d
r
a
p
id
ly
.
O
n
e
m
o
r
e
c
o
m
m
o
n
ex
am
p
le
is
th
e
u
s
ag
e
o
f
b
lack
b
o
ar
d
t
h
at
is
u
s
ed
b
y
s
ch
o
o
ls
,
co
lleg
es
a
n
d
u
n
iv
er
s
ities
ar
o
u
n
d
th
e
wo
r
ld
,
all
th
ese
b
lack
b
o
a
r
d
s
y
s
tem
s
s
to
r
e
t
h
e
d
ata
i
n
th
e
clo
u
d
an
d
m
a
k
e
atten
d
in
g
s
ch
o
o
l
m
u
ch
ea
s
ier
.
W
ith
C
lo
u
d
’
s
m
as
s
iv
e
co
m
p
u
tatio
n
p
o
wer
la
n
g
u
ag
e
b
ar
r
ier
s
h
av
e
alr
ea
d
y
f
a
d
ed
.
T
h
er
e
ar
e
m
an
y
s
ec
u
r
ity
th
r
ea
t
s
[
3
]
lin
k
ed
to
h
o
s
tin
g
n
u
m
er
o
u
s
u
s
er
s
an
d
in
f
o
r
m
atio
n
s
to
r
a
g
e
in
clo
u
d
co
m
p
u
tin
g
,
th
at
ca
n
b
e
m
itig
at
ed
b
y
s
tr
o
n
g
s
ec
u
r
ity
m
e
ch
an
i
s
m
s
o
f
clo
u
d
co
m
p
u
tin
g
to
e
n
s
u
r
e
th
e
in
f
o
r
m
atio
n
is
o
latio
n
o
f
u
s
er
s
.
B
u
t
th
is
b
ec
o
m
es
ev
en
m
o
r
e
co
m
p
licated
.
B
y
way
o
f
in
s
tan
ce
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a
h
ac
k
er
c
an
d
ep
l
o
y
m
alicio
u
s
s
o
f
twar
e
with
in
a
b
o
r
d
e
r
n
o
d
e,
wh
ich
co
n
s
eq
u
e
n
tly
co
u
l
d
ex
p
lo
it
a
v
u
ln
er
a
b
ilit
y
wh
ich
ca
n
h
am
p
er
th
e
q
u
ality
o
f
s
er
v
ice
o
f
th
eir
r
o
u
ter
.
Su
c
h
k
in
d
o
f
th
r
ea
ts
m
ig
h
t h
av
e
a
s
u
b
s
tan
tial n
eg
ativ
e
ef
f
ec
t.
Fu
r
th
er
m
o
r
e
,
if
u
s
er
-
s
p
ec
if
ic
d
ata
h
as
to
b
e
tem
p
o
r
ar
ily
s
a
v
ed
o
n
m
u
ltip
le
b
o
r
d
er
lo
ca
ti
o
n
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to
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co
m
p
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p
r
o
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r
ity
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es
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ea
lt
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th
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o
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e
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y
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co
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p
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ec
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r
ity
m
ec
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is
m
s
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An
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th
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ar
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cr
y
p
tio
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&
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r
y
p
tio
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m
ec
h
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ics
th
at
ar
e
en
er
g
y
in
te
n
s
iv
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an
d
r
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u
r
ce
h
u
n
g
r
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an
d
ca
n
u
s
e
th
e
lar
g
e
-
s
ca
le
n
atu
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o
f
d
is
p
er
s
ed
clo
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d
s
.
On
e
an
o
th
er
ar
ea
o
f
ac
tiv
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r
es
ea
r
ch
is
th
e
ap
p
r
o
ac
h
to
d
etec
t
in
tr
u
s
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ex
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m
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le,
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s
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o
m
aly
d
etec
tio
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b
u
t
th
is
will
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av
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to
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e
b
u
ilt
f
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ea
l
tim
e
attac
k
s
co
n
s
u
m
in
g
en
o
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m
o
u
s
am
o
u
n
t
o
f
r
eso
u
r
ce
s
an
d
b
an
d
wid
th
,
th
is
b
ec
o
m
es m
o
r
e
c
h
allen
g
in
g
in
a
r
estricte
d
en
v
ir
o
n
m
en
t f
o
r
u
p
c
o
m
in
g
I
o
T
w
o
r
k
lo
a
d
s
.
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lo
u
d
co
m
p
u
tin
g
is
co
s
t
ef
f
ec
t
iv
e
if
th
e
clo
u
d
en
v
ir
o
n
m
e
n
t
is
d
ep
lo
y
e
d
co
r
r
ec
tly
,
b
u
t
t
h
er
e
ar
e
lo
ts
o
f
ch
allen
g
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f
ac
ed
in
d
ep
lo
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i
n
g
it
r
ig
h
t.
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lo
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d
u
s
ag
e
ca
n
p
r
o
v
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to
b
e
v
er
y
ex
p
e
n
s
iv
e
f
o
r
s
m
a
ll
en
ter
p
r
is
es
wh
ich
ar
e
r
ely
in
g
s
o
lely
o
n
Pu
b
lic
C
l
o
u
d
C
o
m
p
u
tin
g
in
f
r
astru
ctu
r
e,
h
en
ce
wi
th
p
ay
-
as
-
you
-
g
o
a
n
d
o
n
d
em
an
d
clo
u
d
s
er
v
ices,
th
e
s
er
v
ice
lev
el
ag
r
e
em
en
t
an
d
ass
u
r
an
ce
t
h
at
s
er
v
i
ce
lev
els
ar
e
b
ein
g
m
et
h
o
ld
a
cr
itical
im
p
o
r
tan
ce
.
A
lo
t
o
f
r
esear
ch
ac
tiv
ity
is
h
e
n
ce
d
e
r
iv
ed
b
ased
o
n
th
e
C
lo
u
d
co
m
p
u
tin
g
ec
o
n
o
m
ics
a
n
d
p
r
icin
g
,
n
eg
o
tiati
n
g
b
illi
n
g
an
d
s
er
v
ice
-
lev
el
ag
r
ee
m
en
ts
with
clo
u
d
p
r
o
v
id
e
r
s
,
C
lo
u
d
m
o
n
ito
r
in
g
&
m
a
n
ag
em
en
t
an
d
C
lo
u
d
d
is
aster
r
ec
o
v
er
y
.
W
e
will d
is
cu
s
s
th
es
e
in
th
e
u
p
co
m
in
g
s
ec
tio
n
s
.
T
h
is
s
u
r
v
ey
p
ap
er
is
o
r
g
an
iz
ed
as
f
o
llo
ws:
I
n
s
ec
tio
n
1
,
an
in
tr
o
d
u
ctio
n
to
cl
o
u
d
co
m
p
u
tin
g
is
p
r
esen
ted
;
s
ec
tio
n
2
g
iv
es
an
o
v
er
v
iew
o
f
s
u
r
v
ey
p
a
p
er
s
p
u
b
l
is
h
ed
o
n
clo
u
d
co
m
p
u
tin
g
,
s
ec
tio
n
3
d
escr
ib
es
th
e
ar
ch
itectu
r
e
o
f
clo
u
d
co
m
p
u
tin
g
,
s
ec
tio
n
4
d
is
cu
s
s
es
th
e
clo
u
d
co
m
p
u
tin
g
s
er
v
ice
m
o
d
els,
s
ec
tio
n
5
d
escr
ib
es
th
e
d
ep
lo
y
m
e
n
t
m
o
d
els
o
f
clo
u
d
,
s
ec
tio
n
6
d
is
cu
s
s
es
clo
u
d
co
m
p
u
tin
g
o
p
en
ar
c
h
itectu
r
e,
s
ec
tio
n
7
d
ef
in
es
clo
u
d
s
to
r
ag
e
m
o
d
els,
s
ec
tio
n
8
d
is
cu
s
s
es a
b
o
u
t v
i
r
tu
aliza
tio
n
i
n
cl
o
u
d
co
m
p
u
tin
g
,
in
s
ec
tio
n
9
v
ar
io
u
s
clo
u
d
s
er
v
ice
p
r
o
v
id
e
r
s
h
av
e
b
ee
n
d
escr
ib
ed
,
s
ec
tio
n
1
0
g
iv
es
an
o
v
er
v
iew
o
f
o
p
e
n
s
o
u
r
ce
v
ir
tu
aliza
tio
n
p
latf
o
r
m
f
o
r
p
r
i
v
ate
clo
u
d
,
in
s
ec
tio
n
1
1
v
ar
io
u
s
cl
o
u
d
s
ec
u
r
ity
r
is
k
s
h
av
e
b
ee
n
d
is
cu
s
s
ed
,
s
ec
tio
n
1
2
id
en
tifie
s
r
ec
en
t
tech
n
o
lo
g
y
tr
en
d
s
in
th
e
er
a
o
f
clo
u
d
co
m
p
u
tin
g
,
s
ec
tio
n
1
3
d
escr
ib
es th
e
ch
allen
g
es in
clo
u
d
c
o
m
p
u
tin
g
,
s
e
ctio
n
1
4
g
iv
es
an
o
v
er
v
iew
o
f
L
aws,
p
o
licies
an
d
r
eg
u
latio
n
s
in
clo
u
d
c
o
m
p
u
tin
g
,
s
ec
tio
n
1
5
d
is
cu
s
s
es
t
h
e
u
p
co
m
i
n
g
clo
u
d
co
m
p
u
tin
g
tech
n
o
lo
g
ies,
s
ec
tio
n
1
6
d
is
cu
s
s
es o
u
r
f
u
tu
r
e
wo
r
k
in
th
is
ar
ea
an
d
s
ec
tio
n
1
7
c
o
n
clu
d
es th
e
p
ap
er
.
Fig
u
r
e
1
.
C
lo
u
d
co
m
p
u
tin
g
s
er
v
ice
f
ea
tu
r
es
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B
ACK
G
RO
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h
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tu
d
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119
T
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I
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[
4
]
2
0
1
4
M
s.
G
a
y
a
t
h
r
i
,
P
r
o
f
.
S
r
i
n
i
v
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Th
e
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M
o
b
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C
o
mp
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l
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p
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,
a
n
d
M
o
b
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l
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C
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(
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)
h
a
v
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d
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c
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A
n
o
v
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w
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ms o
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c
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a
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d
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t
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:
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p
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s
[
5
]
2
0
1
1
H
o
a
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T.
D
i
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h
,
C
h
o
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,
D
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(
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f
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t
a
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d
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o
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s,
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c
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d
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f
i
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o
n
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a
r
c
h
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p
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s
[
6
]
2
0
0
8
P
a
t
r
í
c
i
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Ta
k
a
k
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E
n
d
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l
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Es
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G
o
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D
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S
a
d
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Th
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so
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[
7
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2
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S
.
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2
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A
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[
2
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2
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1
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h
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[
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5
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2
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[
2
6
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2
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M
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[
2
7
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2
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C
.
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3.
CL
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ter
m
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o
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ca
p
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an
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s
etc.
,
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t
o
d
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p
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h
e
co
m
p
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r
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u
d
-
b
ased
s
er
v
ice
s
h
av
e
th
eir
d
is
tin
ct
an
d
u
n
iq
u
e
an
d
d
is
tin
ct
clo
u
d
ar
ch
itec
tu
r
es.
T
h
e
g
en
er
ic
cl
o
u
d
ar
ch
itectu
r
e
is
s
h
o
wn
i
n
Fig
u
r
e
2
th
at
s
h
o
ws
b
asic
elem
en
ts
o
f
th
e
clo
u
d
co
m
p
u
tin
g
Ar
ch
itectu
r
e
in
clu
d
in
g
I
n
f
r
astru
ct
u
r
e,
Sto
r
a
g
e,
Ser
v
ice,
Ap
p
licatio
n
,
Ma
n
ag
em
en
t a
n
d
Secu
r
ity
co
m
p
o
n
en
ts
.
Fig
u
r
e
2
.
A
g
en
er
ic
clo
u
d
c
o
m
p
u
tin
g
ar
c
h
itectu
r
e
Evaluation Warning : The document was created with Spire.PDF for Python.
I
n
t J I
n
f
&
C
o
m
m
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n
T
ec
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n
o
l
I
SS
N:
2252
-
8
7
7
6
C
lo
u
d
co
mp
u
tin
g
s
u
r
ve
y
o
n
s
e
r
vice
s
,
en
h
a
n
ce
men
ts
a
n
d
c
h
a
l
len
g
es in
th
e
era
o
f m
a
ch
in
e…
(
Wa
jid
Ha
s
s
a
n
)
121
4.
SE
RV
I
C
E
M
O
D
E
L
S
T
h
e
s
er
v
ice
m
o
d
els
o
f
clo
u
d
c
o
m
p
u
tin
g
r
ep
r
esen
t
d
if
f
er
en
t
d
eliv
er
y
m
o
d
els
o
f
clo
u
d
th
at
ar
e
u
s
ed
with
th
e
d
ep
lo
y
m
e
n
t
m
o
d
els
o
f
clo
u
d
.
T
h
e
s
er
v
ice
m
o
d
els
o
f
clo
u
d
ar
e
th
e
So
f
twar
e
as
a
Ser
v
ice
(
SaaS)
,
Platfo
r
m
as
a
Ser
v
ice
(
PaaS)
an
d
I
n
f
r
as
tr
u
ctu
r
e
as
a
Ser
v
ice
(
I
aa
S).
F
ig
u
r
e
3
s
h
o
ws
th
e
n
ec
ess
ar
y
c
lass
if
icatio
n
o
f
th
e
r
o
les
th
at
o
n
e
p
ar
ticu
lar
s
er
v
ic
e
m
o
d
el
f
u
lf
ills
.
T
h
e
ex
am
p
le
o
f
ea
ch
o
f
th
e
s
er
v
ice
m
o
d
el
is
g
iv
en
in
T
ab
le
2
.
Fig
u
r
e
3
d
escr
ib
es
th
e
r
esp
o
n
s
ib
ilit
y
an
d
m
an
ag
em
en
t
o
f
th
e
clo
u
d
u
s
er
an
d
clo
u
d
p
r
o
v
i
d
er
m
an
ag
in
g
d
is
tin
ct
co
m
p
o
n
en
ts
o
f
th
e
o
f
f
e
r
in
g
.
Fig
u
r
e
3
.
C
lass
if
icatio
n
o
f
clo
u
d
s
b
ased
o
n
th
e
Ser
v
ice
Mo
d
el
4
.
1
.
I
nfr
a
s
t
ruct
ure
a
s
a
s
er
v
ice
(
I
a
a
S)
T
h
is
is
th
e
lo
west
lev
el
o
f
s
er
v
ice
p
r
o
v
id
e
d
to
clo
u
d
u
s
er
wit
h
g
r
ea
test
f
lex
ib
ilit
y
[
2
8
]
wh
e
r
e
th
e
clo
u
d
u
s
er
s
ar
e
p
r
o
v
id
ed
co
n
tr
o
lled
ac
ce
s
s
to
th
e
h
ar
d
war
e
in
f
r
astru
ctu
r
e.
T
h
e
u
s
er
ca
n
d
e
p
lo
y
o
p
er
atin
g
s
y
s
tem
an
d
ap
p
licatio
n
s
o
f
twar
e
o
f
th
eir
c
h
o
ice.
T
h
e
clien
t
d
o
esn
’
t
r
ea
ll
y
h
av
e
th
e
co
n
tr
o
l
o
f
th
e
Ph
y
s
ical
h
ar
d
war
e
b
u
t
ar
e
f
r
ee
to
u
s
e
th
e
v
ir
tu
alize
d
h
a
r
d
war
e
as
th
ey
p
lease.
C
lien
t
h
as
to
m
a
n
ag
e
m
o
s
t
o
f
th
e
s
ec
u
r
ity
asp
ec
ts
o
f
p
r
o
tectin
g
th
e
in
f
r
astru
ctu
r
e.
4
.
2
.
P
l
a
t
f
o
r
m
a
s
a
s
er
v
ice
(
P
a
a
S)
I
n
th
e
Ser
v
ice
Mo
d
el,
Platfo
r
m
So
f
twar
e
is
alr
ea
d
y
in
s
talled
f
o
r
t
h
e
u
s
er
o
f
clo
u
d
s
er
v
ice
s
in
clu
d
in
g
Op
er
atin
g
Sy
s
tem
,
Sto
r
ag
e
Dr
iv
es
C
o
n
tr
o
ller
s
,
Netwo
r
k
in
g
an
d
o
th
er
r
eq
u
ir
e
d
s
o
f
twar
e
[
2
9
]
.
User
ca
n
in
s
tall
th
e
s
o
f
twar
es
th
at
th
ey
n
ee
d
o
n
to
p
o
f
t
h
ese
s
o
f
twar
es.
T
h
e
v
ir
tu
al
in
f
r
astru
ct
u
r
e
a
n
d
h
ar
d
war
e
ar
e
co
n
tr
o
lled
b
y
th
e
C
SP
.
4
.
3
.
So
f
t
wa
re
a
s
a
s
er
v
ice
(
S
a
a
S)
S
aa
S
is
also
ca
lled
‘
o
n
d
em
an
d
s
o
f
twar
e’
.
T
h
is
[
3
0
]
is
a
licen
s
in
g
an
d
s
o
f
twar
e
d
eliv
er
y
m
o
d
el
wh
er
e
a
f
u
lly
f
u
n
ctio
n
al
an
d
co
m
p
le
te
m
o
d
el
is
d
eliv
er
e
d
o
n
th
e
s
u
b
s
cr
ip
tio
n
b
asis
to
th
e
u
s
er
s
o
v
er
web
.
T
h
e
e
n
d
u
s
er
s
ac
ce
s
s
th
e
SaaS
o
f
f
er
in
g
s
ty
p
ically
th
r
o
u
g
h
web
b
r
o
ws
er
.
4
.
4
.
Deskto
p a
s
a
s
er
v
ice
(
Da
a
S)
T
h
is
is
a
k
in
d
o
f
v
ir
tu
al
d
esk
t
o
p
in
f
r
astru
ctu
r
e
(
VDI
)
.
T
h
e
VDI
is
o
u
ts
o
u
r
ce
d
&
h
an
d
led
b
y
th
e
3
r
d
p
ar
ty
.
Daa
S
[
3
1
]
is
a
clo
u
d
s
er
v
ice
d
eliv
er
e
d
f
r
e
q
u
en
tly
alo
n
g
with
th
e
a
p
p
licatio
n
s
o
n
th
e
v
ir
tu
al
d
esk
to
p
.
T
h
e
u
s
er
an
d
u
s
e
ca
s
es f
o
r
ea
ch
o
f
th
e
Ser
v
ice
m
o
d
el
a
r
e
s
h
o
wn
i
n
T
ab
le
3
T
ab
le
2
.
E
x
am
p
le
o
f
clo
u
d
s
er
v
ice
p
r
o
v
id
er
b
ased
o
n
t
h
e
s
er
v
ice
m
o
d
el
S
e
r
v
i
c
e
M
o
d
e
l
D
e
scri
p
t
i
o
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Ex
a
m
p
l
e
I
n
f
r
a
st
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u
c
t
u
r
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a
s
a
S
e
r
v
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c
e
(
I
A
A
S
)
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o
m
p
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t
e
a
p
p
l
i
c
a
t
i
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n
s
t
h
a
t
a
r
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c
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e
d
a
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d
r
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t
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d
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maz
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b
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e
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s,
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d
o
w
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P
l
a
t
f
o
r
m a
s
a
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r
v
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c
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(PAAS)
Th
e
d
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p
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t
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a
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t
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i
n
f
r
a
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t
r
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c
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a
n
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mi
d
d
l
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t
o
d
r
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v
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t
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d
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c
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t
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v
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l
o
p
e
r
R
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a
t
O
p
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h
i
f
t
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o
f
t
w
a
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s
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r
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d
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b
u
t
i
o
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m
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l
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w
h
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c
h
h
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st
a
p
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t
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r
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v
a
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l
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t
e
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t
b
y
t
h
e
t
h
i
r
d
p
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r
t
y
G
o
o
g
l
e
D
o
c
s,
G
o
o
g
l
e
S
h
e
e
t
s;
S
a
l
e
sf
o
r
c
e
.
c
o
m,
I
n
si
g
h
t
l
y
D
e
sk
t
o
p
a
s a
S
e
r
v
i
c
e
(
D
a
a
S
)
Th
e
C
S
P
h
o
st
s
t
h
e
b
a
c
k
e
n
d
o
f
t
h
e
V
i
r
t
u
a
l
D
e
sk
t
o
p
C
i
t
r
i
x
,
V
M
w
a
r
e
Evaluation Warning : The document was created with Spire.PDF for Python.
I
SS
N
:
2
2
5
2
-
8
7
7
6
I
n
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n
f
&
C
o
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m
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T
ec
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n
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,
Vo
l.
9
,
No
.
2,
Au
g
u
s
t
20
20
:
1
1
7
–
139
122
T
ab
le
3
.
User
s
&
u
s
e
ca
s
es o
f
s
er
v
ice
m
o
d
els
S
e
r
v
i
c
e
M
o
d
e
l
U
sers o
f
s
e
r
v
i
c
e
s
S
e
r
v
i
c
e
s
a
v
a
i
l
a
b
l
e
t
o
u
s
e
r
s
P
u
r
p
o
se
o
f
u
si
n
g
s
e
r
v
i
c
e
s
S
a
a
S
B
u
s
i
n
e
ss U
s
e
r
s
E
-
mai
l
,
C
R
M
,
O
f
f
i
c
e
A
u
t
o
mat
i
o
n
,
W
i
k
i
,
W
e
b
si
t
e
t
e
st
i
n
g
,
V
i
r
t
u
a
l
D
e
sk
t
o
p
,
B
l
o
g
To
c
o
m
p
l
e
t
e
t
h
e
t
a
s
k
s
o
f
b
u
s
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n
e
ss
P
a
a
S
D
e
p
l
o
y
e
r
s
a
n
d
D
e
v
e
l
o
p
e
r
s
D
e
v
e
l
o
p
m
e
n
t
,
A
p
p
l
i
c
a
t
i
o
n
a
n
d
s
e
r
v
i
c
e
t
e
st
,
i
n
t
e
g
r
a
t
i
o
n
&
d
e
p
l
o
y
me
n
t
F
o
r
C
r
e
a
t
i
n
g
o
r
d
e
p
l
o
y
i
n
g
serv
i
c
e
s
a
n
d
a
p
p
l
i
c
a
t
i
o
n
s fo
r
t
h
e
u
sers
o
f
c
l
o
u
d
c
o
m
p
u
t
i
n
g
I
a
a
S
U
sed
b
y
S
y
st
e
m
M
a
n
a
g
e
r
s
O
p
e
r
a
t
i
n
g
sy
st
e
ms,
V
i
r
t
u
a
l
ma
c
h
i
n
e
s,
n
e
t
w
o
r
k
s,
C
P
U
,
b
a
c
k
u
p
ser
v
i
c
e
s,
mem
o
r
y
,
m
e
ss
a
g
e
q
u
e
u
e
s,
st
o
r
a
g
e
,
b
a
c
k
u
p
ser
v
i
c
e
s
U
sed
f
o
r
c
r
e
a
t
i
n
g
p
l
a
t
f
o
r
ms
f
o
r
a
p
p
l
i
c
a
t
i
o
n
a
n
d
ser
v
i
c
e
t
e
st
i
n
g
,
i
n
t
e
g
r
a
t
i
o
n
,
d
e
v
e
l
o
p
me
n
t
,
&
d
e
p
l
o
y
m
e
n
t
5.
DE
P
L
O
Y
M
E
NT
M
O
DE
L
S
C
lo
u
d
co
m
p
u
ti
n
g
h
as
f
o
u
r
d
e
p
lo
y
m
en
t
m
o
d
els
n
am
ely
:
Pu
b
li
c
C
lo
u
d
,
Priv
ate
C
lo
u
d
,
Hy
b
r
i
d
C
lo
u
d
&
C
o
m
m
u
n
ity
C
lo
u
d
.
5
.
1
.
P
ri
v
a
t
e
cl
o
ud
As
s
u
g
g
ested
b
y
t
h
e
n
a
m
e,
t
h
e
p
r
iv
ate
clo
u
d
is
m
an
a
g
ed
with
in
o
n
e
o
r
g
a
n
izatio
n
.
Als
o
,
it
is
n
o
t
m
an
d
ato
r
y
th
at
s
am
e
o
r
g
an
izat
io
n
r
u
n
s
th
e
in
f
r
astru
ctu
r
e;
th
ir
d
p
ar
ty
ca
n
also
m
an
a
g
e
it.
Geo
g
r
ap
h
ical
lo
ca
tio
n
[3
2
-
3
4
]
o
f
clo
u
d
ca
n
also
b
e
awa
y
f
r
o
m
th
at
m
a
n
ag
in
g
o
r
g
an
izatio
n
.
B
r
ief
ly
p
r
iv
ate
c
lo
u
d
s
er
v
es
s
in
g
le
o
r
g
an
izatio
n
an
d
is
n
o
t c
o
n
s
u
m
ed
b
y
o
th
er
s
o
u
r
ce
s
o
r
c
u
s
to
m
er
s
.
5
.
2
.
P
ub
lic
clo
ud
T
h
e
s
h
ar
ed
co
m
p
u
tin
g
in
f
r
astru
ctu
r
e
is
p
r
o
v
id
e
d
b
y
th
e
p
u
b
lic
clo
u
d
.
I
ts
p
h
y
s
ical
in
f
r
astru
ctu
r
e
is
em
b
ed
d
e
d
with
in
C
SP
an
d
p
u
b
lic
ca
n
ac
ce
s
s
i
t.
As
r
eso
u
r
ce
s
ar
e
s
h
ar
ed
s
o
th
e
u
s
er
s
p
ay
ac
co
r
d
in
g
to
c
o
n
s
u
m
ed
r
eso
u
r
ce
s
.
T
h
e
p
h
y
s
ical
s
tr
u
ctu
r
e
is
o
u
t
o
f
t
h
e
lo
ca
tio
n
.
Fo
r
in
s
tan
ce
,
VM
s
an
d
p
u
b
lic
s
to
r
a
g
e
ap
p
s
.
I
t
is
a
m
u
lti
-
ten
an
t
v
ir
tu
alize
d
en
v
ir
o
n
m
e
n
t.
I
t
r
ef
er
s
to
th
e
u
s
ag
e
o
f
a
n
u
m
b
er
o
f
d
ata
ce
n
te
r
s
an
d
f
ile
r
ep
licatio
n
s
.
I
t
en
h
an
ce
s
th
e
s
ca
lab
ilit
y
o
f
d
if
f
er
en
t I
T
r
eso
u
r
ce
s
.
5
.
3
.
Co
mm
un
it
y
clo
ud
I
n
co
m
m
u
n
ity
clo
u
d
a
co
m
m
u
n
ity
o
f
u
s
er
s
an
d
o
r
g
an
izati
o
n
s
is
cr
ea
ted
.
All
r
eso
u
r
ce
s
ar
e
s
h
ar
ed
am
o
n
g
d
if
f
er
en
t
o
r
g
an
izatio
n
s
an
d
u
s
er
s
[
3
5
]
.
B
asically
,
th
e
t
er
m
s
,
s
ec
u
r
ity
co
n
ce
r
n
s
an
d
m
is
s
io
n
ar
e
s
h
ar
e
d
at
s
am
e
lev
el
am
o
n
g
c
o
m
m
u
n
ity
f
o
r
m
ed
.
Als
o
,
it
is
n
o
t
m
a
n
d
at
o
r
y
f
o
r
g
eo
g
r
ap
h
ical
lo
ca
tio
n
t
o
b
e
in
th
e
p
r
e
m
is
es
o
f
o
r
g
an
izatio
n
.
5
.
4
.
H
y
brid clo
ud
J
u
s
t
lik
e
n
am
e,
an
am
alg
a
m
o
f
two
o
r
m
o
r
e
clo
u
d
s
f
o
r
m
a
h
y
b
r
id
clo
u
d
[
3
5
,
3
6
]
.
T
h
e
b
est
f
ea
tu
r
e
is
th
at
th
e
in
teg
r
i
ty
o
f
ea
c
h
m
o
d
el
r
em
ain
s
in
tact
wh
ile
s
er
v
in
g
s
o
m
e
co
m
b
in
ed
f
u
n
ctio
n
alities
an
d
s
tan
d
ar
d
tech
n
o
lo
g
ies.
Hy
b
r
id
clo
u
d
s
s
h
ar
e
p
r
o
p
r
ietar
y
tech
n
o
lo
g
y
.
Data
an
d
ap
p
licatio
n
s
ar
e
s
h
a
r
ed
eq
u
all
y
am
o
n
g
p
r
iv
ate
an
d
p
u
b
lic
clo
u
d
’
s
am
a
lg
am
.
Hy
b
r
id
clo
u
d
ca
n
h
an
d
le
an
y
o
v
er
f
lo
w
with
o
u
t
g
iv
in
g
a
cc
ess
to
th
ir
d
p
ar
ty
d
atac
en
ter
s
.
I
t is b
en
ef
icial
in
s
ca
lin
g
r
eso
u
r
ce
s
.
6.
CL
O
UD
CO
M
P
UT
I
NG
O
P
E
N
ARCH
I
T
E
CT
URE
T
h
e
ter
m
E
co
s
y
s
tem
is
a
ter
m
wh
ich
is
u
s
ed
to
d
escr
ib
e
s
y
s
tem
o
f
th
e
co
m
p
o
n
en
ts
wh
ich
ar
e
d
ep
en
d
e
n
t
o
n
ea
ch
o
th
er
wo
r
k
in
g
to
g
eth
er
f
o
r
en
a
b
lin
g
th
e
s
er
v
ices.
I
n
ca
s
e
o
f
th
e
o
p
e
n
ar
ch
itectu
r
e
o
f
clo
u
d
co
m
p
u
tin
g
[
3
7
]
th
is
co
m
p
lex
t
er
m
n
o
t
o
n
ly
in
cl
u
d
es
th
e
tr
ad
itio
n
al
elem
en
ts
ass
o
ciate
d
with
clo
u
d
co
m
p
u
tin
g
lik
e
s
o
f
twar
e
an
d
in
f
r
astru
ctu
r
e,
b
u
t
it
also
in
clu
d
es
co
n
s
u
lt
a
n
ts
,
in
teg
r
ato
r
s
,
th
ir
d
p
ar
ties
,
p
ar
tn
er
s
an
d
all
o
th
e
r
r
elate
d
co
m
p
o
n
e
n
ts
.
T
h
e
cl
o
u
d
is
an
ec
o
s
y
s
tem
o
f
in
ter
co
n
n
ec
ted
ar
r
ay
o
f
s
er
v
ices,
r
eso
u
r
ce
s
an
d
ap
p
licatio
n
s
th
at
p
r
o
v
i
d
e
v
alu
e
f
o
r
c
o
n
s
u
m
er
s
an
d
b
u
s
in
ess
es.
T
h
e
o
p
e
n
a
r
ch
itectu
r
e
o
f
clo
u
d
co
m
p
u
tin
g
[
3
8
]
co
v
e
r
s
s
ev
en
p
r
in
cip
les as sh
o
wn
in
Fig
u
r
e
4
.
T
h
e
d
etails o
f
ea
ch
p
r
in
cip
l
e
ar
e
d
is
cu
s
s
ed
b
elo
w.
Evaluation Warning : The document was created with Spire.PDF for Python.
I
n
t J I
n
f
&
C
o
m
m
u
n
T
ec
h
n
o
l
I
SS
N:
2252
-
8
7
7
6
C
lo
u
d
co
mp
u
tin
g
s
u
r
ve
y
o
n
s
e
r
vice
s
,
en
h
a
n
ce
men
ts
a
n
d
c
h
a
l
len
g
es in
th
e
era
o
f m
a
ch
in
e…
(
Wa
jid
Ha
s
s
a
n
)
123
Fig
u
r
e
4
.
Op
e
n
ar
ch
itectu
r
e
o
f
clo
u
d
c
o
m
p
u
tin
g
[
3
8
]
6
.
1
.
Clo
ud
co
m
pu
t
ing
inte
g
ra
t
ed
ec
o
s
y
s
t
em
m
a
na
g
e
m
ent
T
h
e
clo
u
d
ar
c
h
itectu
r
e
m
u
s
t
s
u
p
p
o
r
t
th
e
ec
o
s
y
s
tem
m
an
a
g
em
en
t
o
f
clo
u
d
e
n
v
ir
o
n
m
en
t.
T
h
e
ec
o
s
y
s
tem
in
a
clo
u
d
en
v
ir
o
n
m
e
n
t
in
clu
d
e
s
all
s
o
lu
tio
n
s
,
in
v
o
lv
ed
s
o
lu
tio
n
p
r
o
v
id
er
s
,
e
n
d
u
s
er
s
an
d
p
a
r
tn
er
s
wh
ich
p
r
o
v
id
e
s
h
ar
ed
r
eso
u
r
ce
s
in
th
e
en
v
ir
o
n
m
en
t
o
f
clo
u
d
.
E
co
s
y
s
tem
m
an
ag
em
en
t
lay
er
in
clo
u
d
c
o
m
p
u
tin
g
p
r
o
v
i
d
es
co
m
m
o
n
u
tili
ties
to
h
o
s
tin
g
en
v
ir
o
n
m
en
t,
s
u
p
p
o
r
ts
th
e
o
p
er
atio
n
s
o
f
f
r
o
n
ten
d
an
d
p
r
o
v
id
es
in
teg
r
ated
o
n
b
o
ar
d
in
g
p
r
o
ce
s
s
es
[
3
8
]
.
I
t
al
s
o
s
u
p
p
o
r
ts
th
e
s
ea
m
less
m
es
s
ag
e
ex
ch
an
g
es
an
d
co
llab
o
r
a
tio
n
am
o
n
g
clo
u
d
v
en
d
o
r
s
,
clien
ts
an
d
p
a
r
tn
er
s
.
6
.
2
.
Virt
ua
li
za
t
i
o
n
f
o
r
clo
ud
infr
a
s
t
ruct
ure
T
h
e
v
ir
tu
aliza
tio
n
ca
n
b
e
e
n
ab
led
in
clo
u
d
co
m
p
u
tin
g
e
n
v
ir
o
n
m
en
t b
y
two
b
asic a
p
p
r
o
ac
h
e
s
.
i.e
.
−
Vir
tu
aliza
tio
n
o
f
h
a
r
d
war
e
u
s
ed
to
m
an
a
g
e
th
e
h
ar
d
war
e
e
q
u
ip
m
en
t in
p
l
u
g
-
an
d
-
p
la
y
m
o
d
e
.
−
Vir
tu
aliza
tio
n
o
f
s
o
f
twar
e
t
h
at
u
s
es
s
o
f
twar
e
co
d
e
v
i
r
tu
al
izatio
n
tech
n
o
lo
g
y
o
r
u
s
es
s
o
f
twar
e
im
ag
e
m
an
ag
em
en
t t
o
en
ab
le
t
h
e
s
h
a
r
in
g
o
f
s
o
f
twar
e.
6
.
3
.
Serv
ice
o
rient
a
t
io
n f
o
r
t
he
re
us
a
ble serv
ice
s
An
o
th
er
en
a
b
lin
g
f
o
r
ce
f
o
r
cl
o
u
d
co
m
p
u
tin
g
is
s
er
v
ice
o
r
ien
t
atio
n
wh
ich
f
u
r
th
er
r
ea
lizes th
e
b
u
s
in
ess
v
alu
e
f
r
o
m
ass
et
r
eu
s
ab
ilit
y
,
c
o
m
p
o
s
ite
ap
p
licatio
n
s
&
m
ash
u
p
s
er
v
ices.
T
h
e
c
o
m
m
o
n
r
e
u
s
ab
le
s
er
v
ices a
r
e
o
f
two
ty
p
es:
−
T
h
e
Ho
r
izo
n
tal
b
u
s
in
ess
s
er
v
ices
o
f
clo
u
d
:
I
t
c
o
n
s
is
ts
o
f
d
if
f
e
r
en
t
p
latf
o
r
m
s
er
v
ice
s
wh
ich
h
id
e
co
m
p
lex
ities
o
f
m
id
d
lewa
r
e,
d
atab
ases
an
d
to
o
ls
.
−
T
h
e
Ver
tical
b
u
s
in
ess
s
er
v
ices o
f
clo
u
d
: I
t in
clu
d
es
all
d
o
m
ain
s
p
e
cif
ic o
r
in
d
u
s
try
speci
f
ic
s
e
rv
ice
s
.
6
.
4
.
E
x
t
ens
i
ble Sub
s
cr
iptio
n
& pro
v
is
io
nin
g
An
ex
ce
p
tio
n
al
f
ea
t
u
r
e
o
f
a
clo
u
d
e
n
v
ir
o
n
m
en
t
is
ex
ten
s
ib
le
p
r
o
v
is
io
n
in
g
o
f
s
er
v
ice.
T
h
e
p
r
o
v
is
io
n
in
g
f
ea
tu
r
e
ca
n
o
n
ly
s
u
p
p
o
r
t o
n
ly
a
p
ar
ticu
lar
ty
p
e
o
f
r
eso
u
r
ce
s
h
ar
in
g
with
o
u
t e
x
te
n
s
ib
ilit
y
.
T
h
is
also
im
p
lies
th
at
th
e
ar
ch
itectu
r
e
o
f
s
er
v
ice
p
r
o
v
is
io
n
in
g
f
o
r
f
r
ee
u
s
e
u
s
er
s
an
d
p
ay
i
n
g
u
s
er
s
wo
u
ld
b
e
s
am
e.
T
h
e
s
er
v
ice
co
n
s
u
m
er
s
ar
e
in
ter
ested
i
n
h
o
w
ea
s
ily
th
ey
ca
n
ac
ce
s
s
s
er
v
ices b
ased
o
n
b
u
s
in
ess
lo
g
ics an
d
th
eir
g
o
als.
6
.
5
.
Clo
ud
o
f
f
er
ing
s
T
h
e
o
f
f
er
in
g
s
o
f
a
clo
u
d
en
v
ir
o
n
m
en
t
ar
e
s
er
v
ices
o
r
f
in
al
p
r
o
d
u
cts
wh
ich
ar
e
p
r
o
v
id
e
d
b
y
p
latf
o
r
m
o
f
clo
u
d
co
m
p
u
tin
g
.
T
h
e
o
f
f
e
r
in
g
s
o
f
a
clo
u
d
ar
e
also
r
ef
er
r
ed
to
as
clo
u
d
b
u
s
in
ess
s
o
lu
t
io
n
as
th
e
y
a
d
d
r
ess
ce
r
tain
b
u
s
in
ess
g
o
als.
Mo
s
t
o
f
th
e
clo
u
d
o
f
f
er
i
n
g
s
ar
e
ac
ce
s
s
ed
th
r
o
u
g
h
web
b
r
o
wser
.
E
x
am
p
les
in
clu
d
e
in
f
r
astru
ctu
r
e
clo
u
d
an
d
s
to
r
a
g
e
clo
u
d
.
T
h
e
ev
o
lv
in
g
ec
o
s
y
s
tem
o
f
cl
o
u
d
co
m
p
u
tin
g
ar
c
h
itectu
r
e
s
h
o
wn
in
Fig
u
r
e
5
.
Evaluation Warning : The document was created with Spire.PDF for Python.
I
SS
N
:
2
2
5
2
-
8
7
7
6
I
n
t J I
n
f
&
C
o
m
m
u
n
T
ec
h
n
o
l
,
Vo
l.
9
,
No
.
2,
Au
g
u
s
t
20
20
:
1
1
7
–
139
124
Fig
u
r
e
5
.
T
h
e
ev
o
lv
in
g
ec
o
s
y
s
tem
o
f
clo
u
d
co
m
p
u
tin
g
ar
ch
it
ec
tu
r
e
6
.
6
.
Unifie
d
ex
cha
ng
e
f
r
a
m
e
wo
rk
a
nd
info
rma
t
io
n r
epre
s
ent
a
t
io
n
I
n
o
r
d
er
to
en
a
b
le
co
llab
o
r
ativ
e
an
d
ef
f
ec
tiv
e
clo
u
d
co
m
p
u
ti
n
g
f
ea
tu
r
es,
th
e
m
ess
ag
e
an
d
in
f
o
r
m
atio
n
ex
ch
an
g
e
o
f
r
eso
u
r
ce
s
o
f
clo
u
d
co
m
p
u
tin
g
is
v
er
y
im
p
o
r
tan
t.
I
n
o
p
en
ar
ch
itectu
r
e
o
f
clo
u
d
co
m
p
u
tin
g
,
co
m
p
u
tin
g
r
eso
u
r
ce
s
in
clu
d
e
a
ll
b
u
s
in
ess
en
titi
es
(
e.
g
.
clien
ts
,
p
ar
tn
e
r
s
an
d
v
en
d
o
r
s
)
a
n
d
s
u
p
p
o
r
tin
g
r
eso
u
r
ce
s
lik
e
v
ir
tu
aliza
tio
n
m
o
d
u
les,
s
er
v
ice
o
r
ien
tatio
n
r
elate
d
m
o
d
u
les,
clo
u
d
co
r
e
an
d
clo
u
d
o
f
f
er
in
g
s
.
T
h
e
ar
ch
itectu
r
e
o
f
clo
u
d
in
f
o
r
m
at
io
n
f
lo
ws
in
a
s
y
n
c
h
r
o
n
ized
way
to
ca
r
r
y
o
u
t
c
o
m
m
u
n
icatio
n
am
o
n
g
d
if
f
er
en
t
m
o
d
u
les ef
f
ec
tiv
ely
.
6
.
7
.
Clo
ud
qu
a
lity
& g
o
v
er
na
nce
T
h
e
m
o
s
t
im
p
o
r
tan
t
m
o
d
u
le
in
o
p
e
n
ar
ch
itectu
r
e
o
f
clo
u
d
co
m
p
u
tin
g
is
th
e
clo
u
d
q
u
ality
an
d
g
o
v
er
n
an
ce
.
T
h
is
m
o
d
u
le
is
r
e
s
p
o
n
s
ib
le
f
o
r
th
e
d
e
f
in
itio
n
&
i
d
en
tific
atio
n
g
u
id
elin
es
an
d
q
u
ality
in
d
icato
r
s
f
o
r
clo
u
d
to
g
o
v
er
n
th
e
d
e
p
lo
y
m
e
n
t,
o
p
er
atio
n
,
d
esig
n
,
an
d
clo
u
d
o
f
f
er
in
g
s
’
m
an
ag
em
e
n
t.
T
h
e
p
ar
am
eter
s
o
f
Qo
S
(
q
u
ality
o
f
s
er
v
ice)
ca
n
b
e
u
s
e
d
as
q
u
ality
in
d
icato
r
s
.
T
h
e
tr
ac
ea
b
ilit
y
en
ab
lem
en
t
an
d
co
m
p
lian
ce
v
alid
atio
n
ca
n
b
e
u
s
ed
t
o
ch
ec
k
th
e
in
teg
r
ity
.
On
e
im
p
o
r
tan
t c
lo
u
d
q
u
al
ity
asp
ec
t is secu
r
ity
.
7.
CL
O
UD
S
T
O
RAG
E
M
O
DE
L
S
Dif
f
er
en
t
clo
u
d
s
o
lu
tio
n
s
h
a
v
e
d
if
f
er
en
t
cl
o
u
d
s
to
r
a
g
e
ar
c
h
itectu
r
es.
T
h
e
v
a
r
io
u
s
d
ep
l
o
y
m
en
t
o
p
tio
n
s
in
clu
d
e
th
e
p
u
b
lic,
p
r
iv
ate
an
d
h
y
b
r
i
d
clo
u
d
s
.
T
h
er
e
ar
e
f
u
n
d
am
en
tally
th
r
ee
s
to
r
ag
e
ar
c
h
itectu
r
es
f
o
r
s
to
r
in
g
th
e
d
ata
in
ter
n
ally
.
7
.
1
.
Sh
a
re
d
f
ile
/
blo
ck
s
t
o
r
a
g
e
s
y
s
t
em
I
n
Sh
ar
ed
Fil
e
Sto
r
ag
e
m
o
d
el,
th
e
f
iles
ar
e
s
h
ar
ed
am
o
n
g
d
esire
d
u
s
er
s
.
Fil
es
ar
e
s
p
lit
in
to
f
o
ld
er
s
an
d
s
u
b
-
f
o
ld
er
s
.
T
h
ese
ar
e
th
en
m
a
d
e
av
a
ilab
le
to
u
s
er
s
th
r
o
u
g
h
i
n
ter
n
et.
Fo
r
d
ata
s
to
r
ag
e
a
n
d
ac
c
ess
in
g
th
e
p
r
o
to
co
l
ca
n
b
e
an
y
lik
e
C
o
m
m
o
n
I
n
ter
n
et
Fil
e
Sy
s
tem
(
C
I
FS
)
,
Ser
v
er
Me
s
s
ag
e
B
lo
ck
(
SMB
)
an
d
Netwo
r
k
Fil
e
Sy
s
tem
(
NFS).
7
.
2
.
O
bje
c
t
s
t
o
ra
g
e
s
y
s
t
em
I
n
o
b
ject
s
to
r
ag
e
s
y
s
tem
d
ata
is
co
n
v
e
r
ted
in
to
o
b
jects
to
s
to
r
e
o
r
to
ac
ce
s
s
.
E
ac
h
an
d
e
v
er
y
o
b
ject
co
n
tain
s
a
u
n
i
v
er
s
al
k
ey
,
Hash
,
UR
L
u
n
d
e
r
th
e
s
ce
n
a
r
io
o
f
web
s
er
v
ices.
I
ts
p
r
im
e
p
r
o
t
o
co
l
is
HT
T
P.
T
h
e
s
to
r
ag
e
is
p
r
o
v
id
ed
b
y
C
lo
u
d
Data
Ma
n
ag
em
en
t I
n
ter
f
ac
e
(
C
DM
I
)
.
7
.
3
.
Da
t
a
ba
s
e
o
r
T
a
ble S
t
o
r
a
g
e
Sy
s
t
em
R
elatio
n
al
Data
b
ase
Ma
n
ag
em
en
t
Sy
s
tem
(
R
D
B
Ms)
o
r
r
el
atio
n
al
d
atab
ase
is
th
e
co
m
m
o
n
tech
n
iq
u
e
b
y
wh
ich
m
ajo
r
ity
o
f
in
d
u
s
tr
i
es
s
to
r
e
d
ata.
T
h
e
s
to
r
ag
e
is
in
th
e
f
o
r
m
o
f
r
o
ws
an
d
co
lu
m
n
s
.
Data
b
ase
m
ajo
r
co
n
ce
r
n
is
to
k
ee
p
t
h
e
in
te
g
r
ity
an
d
m
itig
ate
r
ed
u
n
d
a
n
cy
.
Ho
wev
er
,
s
ca
lab
ilit
y
an
d
p
er
f
o
r
m
an
ce
ar
e
o
th
er
is
s
u
es.
8.
VIRT
UAL
I
Z
AT
I
O
N
Vir
tu
aliza
tio
n
is
o
n
e
o
f
m
ain
d
r
iv
er
s
o
f
C
lo
u
d
C
o
m
p
u
tin
g
.
Vir
tu
aliza
tio
n
r
ef
er
s
to
h
av
in
g
m
u
ltip
le
v
ir
tu
al
m
ac
h
in
es
a
n
d
u
s
er
s
o
n
o
n
e
s
in
g
le
s
er
v
er
.
T
h
e
k
ey
tech
n
o
l
o
g
y
e
n
ab
ler
o
f
C
l
o
u
d
C
o
m
p
u
tin
g
is
v
ir
tu
aliza
tio
n
a
n
d
is
p
r
esen
t
f
o
r
s
o
m
e
tim
e
n
o
w.
Dep
en
d
i
n
g
o
n
th
e
ty
p
e
o
f
d
ep
lo
y
m
en
t
Hy
p
er
V,
Xen
[
3
9
]
,
VM
war
e,
L
ib
v
er
t
KVM
m
a
k
e
th
e
u
n
d
er
ly
in
g
p
latf
o
r
m
f
o
r
C
lo
u
d
C
o
m
p
u
tin
g
[
4
0
]
an
d
h
en
ce
clo
u
d
c
o
m
p
u
tin
g
p
o
s
s
ib
le.
E
ac
h
o
f
th
e
v
ir
tu
aliza
tio
n
tech
n
iq
u
es
is
d
is
cu
s
s
ed
b
elo
w.
So
m
e
r
ec
en
t
ad
v
an
ce
s
in
C
lo
u
d
T
ec
h
n
o
lo
g
ies
h
av
e
m
ad
e
th
e
clo
u
d
s
er
v
ices
m
o
r
e
a
g
ile
an
d
r
o
b
u
s
t.
Do
ck
er
,
Ku
b
er
n
etes
,
L
in
u
x
C
o
n
tain
e
r
s
,
Vir
tu
aliza
tio
n
h
av
e
en
a
b
led
wid
e
d
ep
lo
y
m
e
n
t
an
d
a
d
o
p
tio
n
o
f
f
ast
r
eliab
le
an
d
s
ca
lab
l
e
clo
u
d
s
.
T
h
ese
ar
e
d
is
cu
s
s
ed
b
elo
w.
Evaluation Warning : The document was created with Spire.PDF for Python.
I
n
t J I
n
f
&
C
o
m
m
u
n
T
ec
h
n
o
l
I
SS
N:
2252
-
8
7
7
6
C
lo
u
d
co
mp
u
tin
g
s
u
r
ve
y
o
n
s
e
r
vice
s
,
en
h
a
n
ce
men
ts
a
n
d
c
h
a
l
len
g
es in
th
e
era
o
f m
a
ch
in
e…
(
Wa
jid
Ha
s
s
a
n
)
125
8
.
1
.
Co
nt
a
iners
C
o
n
tain
er
s
ar
e
ta
k
in
g
a
lar
g
er
f
o
o
tp
r
in
t
in
t
h
e
clo
u
d
co
m
p
u
tin
g
m
o
d
el.
I
t
c
o
m
p
lem
en
ts
t
h
e
Vir
tu
al
Ma
ch
in
es.
On
e
o
f
th
e
m
ajo
r
d
if
f
er
en
ce
s
b
etwe
en
co
n
tain
er
s
an
d
v
ir
tu
al
m
ac
h
in
e
is
th
e
ab
s
tr
ac
tio
n
o
f
h
o
s
tin
g
r
eso
u
r
ce
s
as sh
o
win
g
in
Fig
u
r
e
6
.
C
o
n
tain
er
s
p
r
o
v
i
d
e
a
r
ea
s
o
n
ab
le
p
ac
k
ag
i
n
g
m
ec
h
an
is
m
wh
er
e
s
o
f
twar
e
m
ay
b
e
ab
s
tr
ac
ted
i
n
th
e
s
u
r
r
o
u
n
d
in
g
s
wh
er
e
th
e
y
r
ea
ll
y
r
u
n
.
T
h
e
d
ec
o
u
p
lin
g
en
a
b
les
co
n
tai
n
er
-
b
ased
s
o
f
twar
e
d
ep
lo
y
m
e
n
t
co
n
s
is
ten
tly
an
d
r
ea
d
ily
,
wh
eth
er
th
e
tar
g
eted
en
v
ir
o
n
m
en
t
is
th
e
p
u
b
lic
clo
u
d
,
a
p
er
s
o
n
al
d
ata
ce
n
ter
o
r
th
e
p
er
s
o
n
al
lap
to
p
o
f
a
d
ev
elo
p
e
r
.
A
clea
r
s
ep
ar
atio
n
o
f
is
s
u
es
i
s
g
iv
en
b
y
co
n
t
ain
er
izatio
n
,
as
th
e
p
r
o
g
r
a
m
m
er
s
f
o
c
u
s
o
n
d
ep
en
d
en
cies
an
d
lo
g
ic
o
f
th
eir
ap
p
li
ca
tio
n
,
wh
er
ea
s
th
e
g
r
o
u
p
s
o
f
I
T
o
p
er
atio
n
s
f
o
cu
s
o
n
th
e
m
a
n
ag
em
en
t
&
d
ep
lo
y
m
en
t
with
o
u
t
ev
e
n
b
o
th
e
r
in
g
a
b
o
u
t
th
e
p
r
o
g
r
am
d
etails
lik
e
s
p
ec
ial
co
n
f
ig
u
r
atio
n
s
an
d
s
o
f
twar
e
v
e
r
s
io
n
s
th
at
ar
e
s
p
ec
if
ic
to
p
r
o
g
r
am
.
8
.
2
.
L
inu
x
co
nta
iners
(
L
XC)
L
in
u
x
c
o
n
tain
er
s
s
er
v
e
as
li
g
h
tweig
h
t
alter
n
ativ
es
to
f
u
ll
m
ac
h
in
e
v
ir
tu
aliza
tio
n
.
L
i
n
u
x
o
f
f
e
r
s
a
p
o
wer
f
u
l
API
an
d
to
o
ls
ets
f
o
r
h
elp
in
g
u
s
er
s
ea
s
ily
m
a
n
ag
e
a
n
d
cr
e
ate
s
y
s
tem
s
o
r
th
e
a
p
p
lic
atio
n
co
n
tain
er
s
v
ia
L
in
u
x
c
o
n
tain
er
s
.
T
h
e
v
i
r
tu
al
en
v
ir
o
n
m
en
t
o
f
L
i
n
u
x
co
n
tain
er
s
h
as
its
C
PU,
o
wn
m
em
o
r
y
,
n
etwo
r
k
f
u
n
ctio
n
ality
,
b
l
o
ck
in
p
u
t a
n
d
o
u
tp
u
t a
n
d
m
o
r
e.
I
t p
r
o
v
id
es t
h
e
v
ir
tu
al
en
v
ir
o
n
m
en
t v
ia
th
e
cg
r
o
u
p
s
f
ea
tu
r
es in
th
e
L
in
u
x
k
er
n
el.
L
XC
ty
p
ically
o
f
f
er
less
is
o
l
atio
n
th
an
a
v
i
r
tu
al
m
ac
h
in
e.
Fig
u
r
e
6
.
Nat
iv
e
a
n
d
co
n
tain
er
ized
ap
p
licatio
n
s
8
.
3
.
Do
c
k
er
(
o
pen so
urce
co
nta
iners)
Do
ck
er
,
o
p
en
s
o
u
r
ce
co
n
tain
er
s
u
s
ed
f
o
r
au
t
o
m
atin
g
ap
p
l
icatio
n
s
’
d
ep
lo
y
m
en
t
as
p
o
r
t
ab
le,
s
elf
-
s
u
f
f
icien
t
co
n
tain
er
s
wh
ich
ca
n
v
ir
tu
ally
r
u
n
an
y
wh
er
e
&
o
n
an
y
s
er
v
er
ty
p
e.
I
t
is
lig
h
tweig
h
t
alter
n
ativ
e
to
th
e
v
ir
tu
aliza
tio
n
o
f
f
u
ll
m
ac
h
in
e
p
r
o
v
id
ed
b
y
th
e
tr
a
d
itio
n
al
h
y
p
e
r
v
is
o
r
s
lik
e
Xen
,
KVM
etc.
[
4
1
]
Vir
tu
al
m
ac
h
in
es
in
tr
ad
itio
n
al
h
y
p
er
v
is
o
r
s
n
ee
d
th
eir
o
wn
o
p
er
atin
g
s
y
s
tem
s
.
B
u
t
o
n
D
o
ck
er
,
co
n
tain
er
r
e
s
id
es
o
n
s
in
g
le
h
o
s
t
OS
an
d
a
p
p
licatio
n
s
o
p
er
ate
i
n
s
id
e
th
is
co
n
tain
er
.
T
h
is
h
o
s
t
OS
ca
n
s
ev
er
d
if
f
er
en
t
co
n
tain
er
s
.
T
h
e
s
u
p
p
o
r
t
o
f
Do
ck
er
is
b
ein
g
i
n
teg
r
ated
wit
h
clo
u
d
p
latf
o
r
m
o
f
O
p
en
Stack
.
8
.
4
.
K
ub
er
net
es (
g
o
o
g
le
co
n
t
a
iner
s
v
c)
An
o
p
e
n
s
o
u
r
ce
p
latf
o
r
m
f
o
r
au
to
m
atin
g
d
ep
lo
y
m
en
t,
m
an
a
g
em
en
t
a
n
d
s
ca
lin
g
o
f
th
e
co
n
tain
er
ized
ap
p
licatio
n
s
is
k
n
o
w
n
as
Ku
b
e
r
n
etes.
T
h
e
c
o
n
tain
er
s
th
at
m
ak
e
u
p
a
p
p
licatio
n
in
to
lo
g
ical
u
n
its
f
o
r
m
an
a
g
em
en
t
an
d
ea
s
y
d
is
co
v
er
y
a
r
e
g
r
o
u
p
e
d
in
th
is
.
Ku
b
er
n
etes
h
as
b
ee
n
b
u
ilt
u
p
o
n
f
if
teen
y
ea
r
s
o
f
ex
p
er
ien
ce
o
f
r
u
n
n
in
g
th
e
wo
r
k
lo
ad
s
o
f
p
r
o
d
u
ctio
n
at
Go
o
g
le,
wh
ich
co
m
b
in
ed
it
with
b
est
id
ea
s
f
r
o
m
co
m
m
u
n
ity
a
n
d
b
r
ee
d
p
r
ac
tices.
Ku
b
er
n
etes
was
d
ev
el
o
p
ed
b
y
Go
o
g
le
wh
ich
o
p
e
n
-
s
o
u
r
c
ed
th
e
p
r
o
ject
in
2
0
1
4
.
Ku
b
er
n
etes
s
u
p
p
lies
a
co
n
tain
er
-
ce
n
tr
ic
d
ir
ec
tio
n
atm
o
s
p
h
er
e.
T
h
is
p
r
o
v
id
es
a
lo
t
o
f
th
e
ea
s
e
o
f
Platfo
r
m
f
o
r
a
Su
p
p
o
r
t
(
PaaS)
to
g
et
h
er
with
th
e
f
lex
ib
ilit
y
o
f
m
an
a
g
e
m
en
t
f
o
r
a
Su
p
p
o
r
t
(
I
aa
S)
an
d
e
m
p
o
wer
s
r
eliab
ilit
y
ac
r
o
s
s
in
f
r
astru
ctu
r
e
s
u
p
p
lier
s
.
8
.
4
.
1.
H
y
perV
(
m
icro
s
o
f
t
hy
perv
is
o
r)
Hy
p
er
-
V
m
an
u
f
ac
tu
r
ed
b
y
Mic
r
o
s
o
f
t,
is
a
h
o
s
t
v
ir
tu
aliza
ti
o
n
p
r
o
d
u
ct
wh
ich
o
f
f
e
r
s
th
e
s
er
v
ices
o
f
v
ir
tu
aliza
tio
n
th
r
o
u
g
h
h
y
p
e
r
v
i
s
o
r
-
b
ased
em
u
latio
n
s
.
Hy
p
er
-
V
is
a
h
o
s
t
h
y
p
e
r
v
is
o
r
w
h
ich
allo
ws
en
tr
y
o
f
o
n
e
p
h
y
s
ical
s
er
v
er
in
to
s
ev
e
r
al
v
i
r
tu
al
s
er
v
er
s
;
ea
ch
v
ir
tu
al
s
er
v
er
s
h
ar
es
th
eir
h
o
s
t
m
ac
h
in
e
h
ar
d
war
e
r
eso
u
r
ce
s
an
d
is
p
o
wer
e
d
b
y
Hy
p
er
-
V.
T
h
e
f
u
n
ctio
n
o
f
Hy
p
er
-
V
is
b
o
th
as
s
tan
d
alo
n
e
o
p
tio
n
an
d
as
ad
d
itio
n
to
W
in
d
o
ws
Ser
v
er
2
0
0
8
R
2
an
d
is
co
n
s
tr
u
c
ted
to
en
h
an
ce
th
e
u
tili
za
tio
n
o
f
s
er
v
er
an
d
d
ec
r
ea
s
e
f
u
n
d
in
g
c
o
s
ts
f
o
r
p
u
r
ch
asin
g
in
-
h
o
u
s
e
s
er
v
er
.
H
y
p
er
-
V
s
tip
u
lates
b
asic
o
p
er
atio
n
to
m
ak
e
th
e
v
ir
t
u
aliza
tio
n
lay
e
r
with
i
n
th
e
s
u
r
f
ac
e
o
f
th
e
s
er
v
er
s
y
s
tem
also
em
p
o
wer
s
g
u
est
o
p
er
atin
g
p
r
o
ce
d
u
r
es
t
o
b
e
s
et
u
p
&
co
n
tr
o
lled
v
ia
in
teg
r
ated
co
n
tr
o
l
co
n
s
o
le
[
4
2
]
.
Evaluation Warning : The document was created with Spire.PDF for Python.
I
SS
N
:
2
2
5
2
-
8
7
7
6
I
n
t J I
n
f
&
C
o
m
m
u
n
T
ec
h
n
o
l
,
Vo
l.
9
,
No
.
2,
Au
g
u
s
t
20
20
:
1
1
7
–
139
126
8
.
4
.
2.
Xen
(
cit
rix
hy
perv
is
o
r)
An
o
p
en
s
o
u
r
ce
s
er
v
er
v
ir
tu
a
lizatio
n
p
latf
o
r
m
w
h
ich
is
b
a
s
ed
o
n
Xen
h
y
p
er
v
is
o
r
an
d
e
n
ab
les
th
e
m
an
ag
em
en
t
&
cr
ea
tio
n
o
f
th
e
in
f
r
astru
ctu
r
e
o
f
v
i
r
tu
alize
d
s
er
v
er
is
ca
lled
C
itrix
Xen
Ser
v
er
.
I
t
h
as
b
ee
n
b
u
ilt
o
v
er
Xen
Vir
tu
al
m
ac
h
in
e
h
y
p
er
v
is
o
r
an
d
is
d
ev
elo
p
ed
b
y
C
i
tr
ix
Sy
s
tem
s
;
it
p
r
o
v
id
es
s
er
v
er
v
ir
tu
aliza
tio
n
an
d
m
o
n
ito
r
in
g
s
er
v
ices.
I
t c
an
b
e
ex
ec
u
ted
o
n
p
r
o
ce
s
s
o
r
s
o
f
en
ti
r
e
x
8
6
s
er
ies an
d
is
av
ailab
le
in
6
4
-
b
it h
y
p
er
v
is
o
r
p
latf
o
r
m
.
I
t
s
u
p
p
o
r
ts
m
o
s
t
s
er
v
er
s
’
o
p
e
r
atin
g
s
y
s
tem
s
an
d
p
r
o
v
i
d
es
th
e
s
tan
d
ar
d
o
p
e
r
atio
n
al
r
eq
u
ir
em
en
ts
o
f
s
er
v
er
s
u
ch
as L
in
u
x
an
d
W
in
d
o
ws s
er
v
er
o
n
t
h
e
g
u
est s
er
v
e
r
m
ac
h
in
es.
T
h
is
v
ir
tu
aliza
tio
n
ad
m
in
is
tr
ato
r
s
u
s
e
th
is
p
latf
o
r
m
to
d
ep
lo
y
,
h
o
s
t
an
d
m
a
n
ag
e
v
ir
tu
al
m
ac
h
in
es.
T
h
is
p
latf
o
r
m
also
d
is
tr
ib
u
tes
th
e
h
ar
d
war
e
r
eso
u
r
ce
s
lik
e
C
PU,
n
etwo
r
k
in
g
,
m
em
o
r
y
an
d
s
to
r
ag
e
to
v
ir
tu
al
m
ac
h
in
es.
T
h
e
m
o
n
ito
r
in
g
co
m
p
o
n
en
t
o
f
th
is
p
latf
o
r
m
m
an
a
g
es
th
e
d
is
tr
ib
u
tio
n
&
allo
ca
tio
n
o
f
th
e
co
m
p
u
tin
g
r
eso
u
r
ce
s
o
f
th
e
p
h
y
s
ica
l
s
er
v
er
am
o
n
g
t
h
e
v
ir
tu
al
m
ac
h
in
es a
n
d
co
n
tr
o
ls
th
eir
p
er
f
o
r
m
an
ce
an
d
u
s
e.
8
.
4
.
3
.
VM
Wa
re
(
VM
Wa
re
h
y
perv
is
o
r)
VM
W
ar
e
is
a
m
u
lti
-
ten
an
t
en
v
ir
o
n
m
en
t
th
r
o
u
g
h
wh
ich
a
s
in
g
le
h
ar
d
war
e
is
d
is
tr
ib
u
t
ed
am
o
n
g
d
if
f
er
en
t
v
ir
tu
al
m
ac
h
in
es.
T
h
e
s
er
v
er
o
f
VM
war
e
wo
r
k
s
u
s
in
g
So
lar
is
,
W
in
d
o
ws,
Netwa
r
e
an
d
L
in
u
x
,
all
o
r
an
y
o
f
th
at
ca
n
b
e
u
s
ed
s
im
u
lt
an
eo
u
s
ly
o
n
th
e
id
en
tical
h
ar
d
war
e.
A
v
ir
tu
al
s
er
v
er
c
o
u
ld
b
e
b
u
ilt o
n
e
tim
e
a
n
d
ca
n
b
e
d
ep
lo
y
ed
m
o
r
e
t
h
an
o
n
e
tim
e
in
t
h
e
d
iv
e
r
s
e
en
v
ir
o
n
m
en
ts
with
VM
war
e
s
er
v
er
.
T
h
e
s
o
f
twar
e
test
in
g
ca
n
b
e
d
o
n
e
ea
s
ily
with
o
u
t setu
p
in
v
ir
tu
al
m
ac
h
in
es
with
VM
war
e
s
er
v
er
.
T
h
e
o
p
er
atio
n
s
o
f
leg
ac
y
o
p
er
atin
g
s
y
s
tem
s
an
d
s
o
f
twar
e
ca
n
b
e
co
n
d
u
cte
d
in
v
ir
t
u
al
m
a
ch
in
es
wh
ich
tak
e
th
e
a
d
v
a
n
tag
e
o
f
a
d
v
an
ce
d
in
f
r
astru
ctu
r
es.
VM
war
e
also
allo
ws
co
n
tr
o
llin
g
th
e
ac
ce
s
s
to
th
e
v
ir
tu
al
m
ac
h
in
es
b
y
co
n
f
ig
u
r
in
g
th
e
p
er
m
is
s
io
n
s
to
m
ee
t
th
e
u
s
er
s
’
n
ee
d
s
.
T
h
e
s
elec
ted
v
ir
tu
al
m
ac
h
in
es
ca
n
b
e
in
itiated
a
u
to
m
atica
lly
wh
en
VM
war
e
Ser
v
er
s
tar
ts
.
VM
war
e
Su
p
p
o
r
t
is
p
r
o
v
id
ed
f
o
r
W
in
d
o
ws Ser
v
er
2
0
0
8
,
W
in
d
o
ws
Vis
ta,
L
in
u
x
5
,
R
ed
Hat
E
n
ter
p
r
is
e
an
d
Ub
u
n
tu
7
.
1
0
in
3
2
&
6
4
b
it
v
er
s
io
n
s
.
VM
W
ar
e
h
y
p
er
v
is
o
r
lib
v
er
t
KVM
(
L
in
u
x
Hy
p
er
v
is
o
r
)
s
h
o
wn
in
Fig
u
r
e
7
.
Fig
u
r
e
7
.
VM
W
ar
e
h
y
p
er
v
is
o
r
lib
v
er
t K
VM
(
lin
u
x
h
y
p
er
v
is
o
r
)
8
.
4
.
3
.
L
ibv
er
t
K
VM
(
L
inu
x
hy
perv
is
o
r
)
A
co
m
p
lete
v
ir
tu
aliza
tio
n
o
p
ti
o
n
f
o
r
L
in
u
x
o
n
th
e
x
8
6
h
ar
d
war
e
co
m
p
r
is
in
g
v
ir
tu
aliza
tio
n
ex
ten
s
io
n
s
(
I
n
tel
VT
o
r
ev
en
AM
D
-
V)
is
KVM
(
s
u
ch
as
Ker
n
el
-
b
ased
Vir
tu
al
Ma
ch
in
e)
.
KVM
is
m
ad
e
u
p
o
f
lo
ad
ab
le
k
er
n
el
m
o
d
u
le,
k
v
m
.
k
o
,
th
at
o
f
f
er
s
th
e
ce
n
ter
v
ir
tu
aliza
t
io
n
in
f
r
astru
ctu
r
e
alo
n
g
with
a
c
h
i
p
s
p
ec
if
ic
m
o
d
u
le,
kvm
-
in
tel.
W
ith
KVM
s
ev
er
al
v
ir
tu
al
m
ac
h
in
es
ca
n
b
e
d
ep
lo
y
e
d
in
clu
d
in
g
u
n
m
o
d
if
ied
L
in
u
x
o
r
ev
e
n
W
in
d
o
ws
im
ag
es.
E
ac
h
v
ir
tu
al
m
ac
h
in
e
in
clu
d
es
p
er
s
o
n
al
s
h
r
ed
d
in
g
h
ar
d
war
e:
d
is
c,
g
r
ap
h
ics
ad
ap
te
r
,
a
c
o
m
m
u
n
ity
ca
r
d
etc.
KVM
is
an
o
p
en
s
o
u
r
ce
p
r
o
g
r
am
.
T
h
e
k
er
n
el
p
ar
t o
f
K
VM
is
co
n
tain
ed
in
m
ain
lin
e
L
in
u
x
,
also
o
f
2
.
6
.
2
0
.
T
h
e
u
s
er
s
p
ac
e
p
ar
t
o
f
KVM
is
co
n
tain
ed
in
m
ain
lin
e
QE
MU
.
Ad
d
itio
n
ally
,
An
d
r
o
id
2
.
2
,
GNU/Hu
r
d
[
2
0
]
.
So
lar
is
1
0
U3
alo
n
g
with
Dar
win
8
.
0
.
1
,
jo
in
tly
with
ad
d
iti
o
n
al
o
p
er
atin
g
s
y
s
tem
s
alo
n
g
with
a
f
ew
n
ewe
r
v
er
s
io
n
s
o
f
th
ese
r
ec
o
r
d
e
d
,
ar
e
p
r
o
v
e
n
to
o
p
er
ate
with
s
p
ec
if
i
c
co
n
s
tr
ain
ts
.
B
y
its
elf
,
KVM
d
o
esn
'
t
ca
r
r
y
o
u
t
an
y
em
u
latio
n
.
I
n
s
tead
,
it
d
i
s
p
lay
s
th
e
d
ev
/k
v
m
p
o
r
t.
Setu
p
th
e
g
u
est
VM
's
ad
d
r
e
s
s
ar
ea
.
T
h
e
f
ir
m
war
e
im
ag
e
m
u
s
t
also
b
e
p
r
o
v
id
ed
b
y
s
er
v
er
(
n
o
r
m
ally
a
p
er
s
o
n
alize
d
B
I
OS
wh
en
em
u
latin
g
PC
s
)
th
e
g
u
est
m
ay
u
s
e
to
b
o
o
ts
tr
ap
to
its
p
r
in
cip
al
OS.
A
co
m
p
ar
is
o
n
b
etwe
en
x
en
,
KVM
,
v
ir
tu
al
b
o
x
an
d
VM
W
ar
e
clo
u
d
s
er
v
ice
p
r
o
v
i
d
er
s
as sh
o
wn
in
T
a
b
l
e
4
.
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