<s>
Cloud	B-General_Concept
load	I-General_Concept
balancing	I-General_Concept
is	O
a	O
type	O
of	O
load	B-Application
balancing	I-Application
that	O
is	O
performed	O
in	O
cloud	B-Architecture
computing	I-Architecture
.	O
</s>
<s>
Cloud	B-General_Concept
load	I-General_Concept
balancing	I-General_Concept
is	O
the	O
process	O
of	O
distributing	O
workloads	O
across	O
multiple	O
computing	O
resources	O
.	O
</s>
<s>
Cloud	B-General_Concept
load	I-General_Concept
balancing	I-General_Concept
reduces	O
costs	O
associated	O
with	O
document	O
management	O
systems	O
and	O
maximizes	O
availability	O
of	O
resources	O
.	O
</s>
<s>
It	O
is	O
a	O
type	O
of	O
load	B-Application
balancing	I-Application
and	O
not	O
to	O
be	O
confused	O
with	O
Domain	O
Name	O
System	O
(	O
DNS	O
)	O
load	B-Application
balancing	I-Application
.	O
</s>
<s>
While	O
DNS	O
load	B-Application
balancing	I-Application
uses	O
software	O
or	O
hardware	O
to	O
perform	O
the	O
function	O
,	O
cloud	B-General_Concept
load	I-General_Concept
balancing	I-General_Concept
uses	O
services	O
offered	O
by	O
various	O
computer	B-Architecture
network	I-Architecture
companies	O
.	O
</s>
<s>
Cloud	B-General_Concept
load	I-General_Concept
balancing	I-General_Concept
has	O
an	O
advantage	O
over	O
DNS	O
load	B-Application
balancing	I-Application
as	O
it	O
can	O
transfer	O
loads	O
to	O
servers	O
globally	O
as	O
opposed	O
to	O
distributing	O
it	O
across	O
local	O
servers	O
.	O
</s>
<s>
In	O
the	O
event	O
of	O
a	O
local	O
server	O
outage	O
,	O
cloud	B-General_Concept
load	I-General_Concept
balancing	I-General_Concept
delivers	O
users	O
to	O
the	O
closest	O
regional	O
server	O
without	O
interruption	O
for	O
the	O
user	O
.	O
</s>
<s>
Cloud	B-General_Concept
load	I-General_Concept
balancing	I-General_Concept
addresses	O
issues	O
relating	O
to	O
TTL	B-Protocol
reliance	I-Protocol
present	O
during	O
DNS	O
load	B-Application
balancing	I-Application
.	O
</s>
<s>
Another	O
advantage	O
is	O
that	O
cloud	B-General_Concept
load	I-General_Concept
balancing	I-General_Concept
improves	O
response	O
time	O
by	O
routing	O
remote	O
sessions	O
to	O
the	O
best	O
performing	O
data	O
centers	O
.	O
</s>
<s>
Cloud	B-Architecture
computing	I-Architecture
brings	O
advantages	O
in	O
"	O
cost	O
,	O
flexibility	O
and	O
availability	O
of	O
service	O
users.	O
"	O
</s>
<s>
Those	O
advantages	O
drive	O
the	O
demand	O
for	O
Cloud	B-Architecture
services	I-Architecture
.	O
</s>
<s>
The	O
demand	O
raises	O
technical	O
issues	O
in	O
Service	O
Oriented	O
Architectures	O
and	O
Internet	B-Architecture
of	I-Architecture
Services	I-Architecture
(	O
IoS	O
)	O
-style	O
applications	O
,	O
such	O
as	O
high	O
availability	O
and	O
scalability	O
.	O
</s>
<s>
As	O
a	O
major	O
concern	O
in	O
these	O
issues	O
,	O
load	B-Application
balancing	I-Application
allows	O
cloud	B-Architecture
computing	I-Architecture
to	O
"	O
scale	O
up	O
to	O
increasing	O
demands	O
"	O
by	O
efficiently	O
allocating	O
dynamic	O
local	O
workload	O
evenly	O
across	O
all	O
nodes	O
.	O
</s>
<s>
Opportunistic	O
Load	B-Application
Balancing	I-Application
(	O
OLB	O
)	O
is	O
the	O
algorithm	O
that	O
assigns	O
workloads	O
to	O
nodes	O
in	O
free	O
order	O
.	O
</s>
<s>
Load	B-Application
balancer	I-Application
forwards	O
packets	O
to	O
web	O
servers	O
according	O
to	O
different	O
workloads	O
on	O
servers	O
.	O
</s>
<s>
However	O
,	O
it	O
is	O
hard	O
to	O
implement	O
a	O
scalable	O
load	B-Application
balancer	I-Application
because	O
of	O
both	O
the	O
"	O
cloud	O
's	O
commodity	O
business	O
model	O
and	O
the	O
limited	O
infrastructure	O
control	O
allowed	O
by	O
cloud	O
providers.	O
"	O
</s>
<s>
Client-side	O
Load	B-Application
Balancer	I-Application
(	O
CLB	O
)	O
solve	O
this	O
problem	O
by	O
using	O
a	O
scalable	O
cloud	B-Application
storage	I-Application
service	I-Application
.	O
</s>
