Overcommit
vs Oversubscribe
When I wrote the Title and
Synopsis for this blog series I happened to choose the word
oversubscription. It’s been pointed out
to me that many people refer to “overcommit” rather than “oversubscribe”.
Both words appear to be in use to
describe this and Google does some nice work to return results using either
option.
What
led me here?
In my role with Metron I
get to visit lots of different people working in lots of different
industries. They are mostly capacity
managers working in IT departments though, so there is some common ground.
Clients
–
“Oh, we don’t oversubscribe”
Over the past year I’ve had a number
of mildly frustrating conversations with organisations. These tend to be newer and/or don’t have a
good history of Capacity Management. The
frustration has been around ‘Oversubscription’ in virtualised
environments.
I’ll start talking about how we can
monitor the environment to ensure good performance in the future. When they’ll stop me and say, quite proudly,
“Oh, we don’t oversubscribe, we don’t want to impact performance”. The pride is almost the worst part. They’ll beam a smile at the senior staff as
if to say “We’ve got this, don’t worry”.
They aren’t concerned about the overspend that’s required to have that
attitude.
Ultimately there is a fear in these departments that oversubscription =
poor performance. I'll be looking at the fear and misunderstanding around this on Friday.
In the meantime there are still a few places available at our VMware Capacity and Performance essentials online workshop, don't forget to book your place now.
http://www.metron-athene.com/services/online-workshops/capacity-management-workshops.html
Phil Bell
Consultant
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