If talking about just max capacity, I would agree with most of the
statements of 80+% being in the right range, likely with a very fine
line of when you actually start seeing a performance impact.
Operationally, at least in our network, I'd never run anything at that
level. Providers that are redundant for each other don't normally
operate above 40-45%, in order to accommodate a failure. Other links
that have a backup, but don't actively load share, normally run up to
about 60-70% before being upgraded. By the time the upgrade is
complete, it could be close to 80%.
--------------------------------------------------------------------------------
Tom Sands
Rackspace Hosting
William Herrin wrote:
On Sat, Aug 29, 2009 at 11:50 PM, devang patel<devan...@gmail.com> wrote:
I just wanted to know what is Link capacity upgrade threshold in terms of %
of link utilization? Just to get an idea...
If your 95th percentile utilization is at 80% capacity, it's time to
start planning the upgrade. If your 95th percentile utilization is at
95% it's time to finish the upgrade.
If you average or median utilizations are at 80% capacity then as
often as not it's time for your boss to fire you and replace you with
someone who can do the job.
Slight variations depending on the resource. Use absolute peak instead
of 95th percentile for modem bank utilization -- under normal
circumstances a modem bank should never ring busy. And a gig-e can run
a little closer to the edge (percentage-wise) before folks notice
slowness than a T1 can.
Regards,
Bill Herrin
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