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<devangnp@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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