<s>
Capacity	B-General_Concept
management	I-General_Concept
's	O
goal	O
is	O
to	O
ensure	O
that	O
information	O
technology	O
resources	O
are	O
sufficient	O
to	O
meet	O
upcoming	O
business	O
requirements	O
cost-effectively	O
.	O
</s>
<s>
One	O
common	O
interpretation	O
of	O
capacity	B-General_Concept
management	I-General_Concept
is	O
described	O
in	O
the	O
ITIL	O
framework	O
.	O
</s>
<s>
ITIL	O
version	O
3	O
views	O
capacity	B-General_Concept
management	I-General_Concept
as	O
comprising	O
three	O
sub-processes	O
:	O
business	O
capacity	B-General_Concept
management	I-General_Concept
,	O
service	O
capacity	B-General_Concept
management	I-General_Concept
,	O
and	O
component	O
capacity	B-General_Concept
management	I-General_Concept
.	O
</s>
<s>
As	O
the	O
usage	O
of	O
IT	O
services	O
change	O
and	O
functionality	O
evolves	O
,	O
the	O
amount	O
of	O
central	B-General_Concept
processing	I-General_Concept
units	I-General_Concept
(	O
CPUs	O
)	O
,	O
memory	O
and	O
storage	O
to	O
a	O
physical	O
or	O
virtual	B-Architecture
server	I-Architecture
etc	O
.	O
</s>
<s>
If	O
there	O
are	O
spikes	O
in	O
,	O
for	O
example	O
,	O
processing	O
power	O
at	O
a	O
particular	O
time	O
of	O
the	O
day	O
,	O
it	O
proposes	O
analyzing	O
what	O
is	O
happening	O
at	O
that	O
time	O
and	O
making	O
changes	O
to	O
maximize	O
the	O
existing	O
IT	B-Application
infrastructure	I-Application
;	O
for	O
example	O
,	O
tuning	O
the	O
application	O
,	O
or	O
moving	O
a	O
batch	O
cycle	O
to	O
a	O
quieter	O
period	O
.	O
</s>
<s>
This	O
capacity	O
planning	O
identifies	O
any	O
potential	O
capacity	O
related	O
issues	O
likely	O
to	O
arise	O
,	O
and	O
justifies	O
any	O
necessary	O
investment	O
decisions	O
-	O
for	O
example	O
,	O
the	O
server	O
requirements	O
to	O
accommodate	O
future	O
IT	O
resource	O
demand	O
,	O
or	O
a	O
data	B-Operating_System
center	I-Operating_System
consolidation	O
.	O
</s>
<s>
Capacity	B-General_Concept
management	I-General_Concept
is	O
concerned	O
with	O
:	O
</s>
<s>
Capacity	B-General_Concept
management	I-General_Concept
interacts	O
with	O
the	O
discipline	O
of	O
Performance	B-General_Concept
Engineering	I-General_Concept
,	O
both	O
during	O
the	O
requirements	O
and	O
design	O
activities	O
of	O
building	O
a	O
system	O
,	O
and	O
when	O
using	O
performance	O
monitoring	O
.	O
</s>
<s>
Packet	B-Protocol
loss	I-Protocol
:	O
In	O
some	O
cases	O
,	O
intermediate	O
devices	O
in	O
a	O
network	O
will	O
lose	O
packets	O
.	O
</s>
<s>
Retransmission	B-Protocol
:	O
When	O
packets	O
are	O
lost	O
in	O
a	O
reliable	O
network	O
,	O
they	O
are	O
retransmitted	O
.	O
</s>
<s>
These	O
factors	O
,	O
and	O
others	O
(	O
such	O
as	O
the	O
performance	O
of	O
the	O
network	O
signaling	O
on	O
the	O
end	O
nodes	O
,	O
compression	B-General_Concept
,	O
encryption	O
,	O
concurrency	O
,	O
and	O
so	O
on	O
)	O
all	O
affect	O
the	O
effective	O
performance	O
of	O
a	O
network	O
.	O
</s>
<s>
Network	B-General_Concept
performance	I-General_Concept
management	I-General_Concept
(	O
NPM	O
)	O
consists	O
of	O
measuring	O
,	O
modeling	O
,	O
planning	O
,	O
and	O
optimizing	O
networks	O
to	O
ensure	O
that	O
they	O
carry	O
traffic	O
with	O
the	O
speed	O
,	O
reliability	O
,	O
and	O
capacity	O
that	O
is	O
appropriate	O
for	O
the	O
nature	O
of	O
the	O
application	O
and	O
the	O
cost	O
constraints	O
of	O
the	O
organization	O
.	O
</s>
<s>
Network	B-General_Concept
Performance	I-General_Concept
management	I-General_Concept
is	O
a	O
core	O
component	O
of	O
the	O
FCAPS	O
ISO	O
telecommunications	O
framework	O
(	O
the	O
'	O
P	O
 '	O
stands	O
for	O
Performance	O
in	O
this	O
acronym	O
)	O
.	O
</s>
<s>
It	O
enables	O
the	O
network	O
engineers	O
to	O
proactively	O
prepare	O
for	O
degradations	O
in	O
their	O
IT	B-Application
infrastructure	I-Application
and	O
ultimately	O
help	O
the	O
end-user	O
experience	O
.	O
</s>
<s>
Per-port	O
metrics	O
are	O
collected	O
using	O
flow-based	O
monitoring	O
and	O
protocols	O
such	O
as	O
NetFlow	B-Protocol
(	O
now	O
standardized	O
as	O
IPFIX	B-Protocol
)	O
or	O
RMON	O
.	O
</s>
<s>
End-user	O
metrics	O
are	O
collected	O
through	O
web	B-Application
logs	I-Application
,	O
synthetic	O
monitoring	O
,	O
or	O
real	O
user	O
monitoring	O
.	O
</s>
<s>
For	O
forensic	O
analysis	O
,	O
operators	O
often	O
rely	O
on	O
sniffers	B-Protocol
that	O
break	O
down	O
the	O
transactions	O
by	O
their	O
protocols	O
and	O
can	O
locate	O
problems	O
such	O
as	O
retransmissions	B-Protocol
or	O
protocol	O
negotiations	O
.	O
</s>
<s>
For	O
capacity	O
planning	O
,	O
modeling	O
tools	O
such	O
as	O
Aria	O
Networks	O
,	O
OPNET	O
,	O
PacketTrap	B-Protocol
,	O
NetSim	O
,	O
NetFlow	B-Protocol
and	O
sFlow	O
Analyzer	O
,	O
or	O
NetQoS	O
that	O
project	O
the	O
impact	O
of	O
new	O
applications	O
or	O
increased	O
usage	O
are	O
invaluable	O
.	O
</s>
<s>
According	O
to	O
Gartner	O
,	O
through	O
2018	O
more	O
than	O
30%	O
of	O
enterprises	O
will	O
use	O
capacity	B-General_Concept
management	I-General_Concept
tools	O
for	O
their	O
critical	O
IT	B-Application
infrastructures	I-Application
,	O
up	O
from	O
less	O
than	O
5%	O
in	O
2014	O
.	O
</s>
<s>
These	O
capacity	B-General_Concept
management	I-General_Concept
tools	O
help	O
infrastructure	O
and	O
operations	O
management	O
teams	O
plan	O
and	O
optimize	O
IT	B-Application
infrastructures	I-Application
and	O
tools	O
,	O
and	O
balance	O
the	O
use	O
of	O
external	O
and	O
cloud	O
computing	O
service	O
providers	O
.	O
</s>
<s>
Terry	O
Slattery	O
,	O
editor	O
at	O
NoJitter.com,	O
compares	O
three	O
such	O
tools	O
,	O
VMWare	O
's	O
Network	O
Insight	O
,	O
PathSolutions	O
TotalView	O
,	O
and	O
Kemp	O
Flowmon	O
,	O
in	O
the	O
article	O
The	O
Future	O
of	O
Network	B-General_Concept
Performance	I-General_Concept
Management	I-General_Concept
,	O
June	O
10	O
,	O
2021	O
.	O
</s>
