[117035] in North American Network Operators' Group
Re: Link capacity upgrade threshold
daemon@ATHENA.MIT.EDU (William Herrin)
Sun Aug 30 00:15:49 2009
In-Reply-To: <d0fea3580908292050m51520cc1y2a14340bcdf53f21@mail.gmail.com>
Date: Sun, 30 Aug 2009 00:15:36 -0400
From: William Herrin <herrin-nanog@dirtside.com>
To: devang patel <devangnp@gmail.com>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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
--
William D. Herrin ................ herrin@dirtside.com bill@herrin.us
3005 Crane Dr. ...................... Web: <http://bill.herrin.us/>
Falls Church, VA 22042-3004
