What is Capacity management?
The ITIL definition of capacity management is:
“Capacity
management is responsible for ensuring that adequate
capacity is
available at all times to
meet the agreed needs of
the business in a cost-effective manner..”
(ITIL
Capacity Management, 2016)
The
important words in this quote are adequate, all times, needs and cost
effective.
Capacity management is simply making sure you have the capacity for the
business at all times, without it costing a fortune. Carrying out Capacity
Management in a cost-effective manner is very important as it’s very easy to do
capacity management with an unlimited budget, for those that don’t budget
planning, monitoring and reporting needs to be done to ensure that the
processes are as efficient and cost effective as possible.
So now we have a good idea of what capacity management is, let’s
look at our next question.
Why are so little of the resources used in Windows environments?
Historically Windows systems weren’t as reliable as they are today, for
instance windows 2003, which had a reliability rating of 98.54. Now that might
sound like a lot but it means that over the course of a year the server was
down for 12.8 hours and that is not acceptable when dealing with critical
systems.
This has led to:
· Windows
systems on average ~5% CPU busy
· Over-specification
of hardware “to avoid performance
problems”
As time has gone on Windows have
improved their reliability but the people managing those systems are still
reluctant to really push the servers because of previous bad experiences.
· “MINE!”
Reluctance to share resources
· Each Windows
machine running only one function e.g. firewall, file server,
database
On Monday I'll be asking whether the move to virtualization technology has corrected this issue.
In the meantime sign up for our Community and get access to some great Capacity Management Resources like white papers and on-demand webinars.
http://www.metron-athene.com/_resources/login.asp
Josh Worth
Consultant
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