[103415] in North American Network Operators' Group
Re: latency (was: RE: cooling door)
daemon@ATHENA.MIT.EDU (Mikael Abrahamsson)
Sat Mar 29 21:33:06 2008
Date: Sun, 30 Mar 2008 03:30:50 +0200 (CEST)
From: Mikael Abrahamsson <swmike@swm.pp.se>
To: nanog@merit.edu
In-Reply-To: <3892.1206839415@dticonsulting.com>
Errors-To: owner-nanog@merit.edu
On Sat, 29 Mar 2008, Frank Coluccio wrote:
> Please clarify. To which network element are you referring in connection with
> extended lookup times? Is it the collapsed optical backbone switch, or the
> upstream L3 element, or perhaps both?
I am talking about the matter that the following topology:
server - 5 meter UTP - switch - 20 meter fiber - switch - 20 meter
fiber - switch - 5 meter UTP - server
has worse NFS performance than:
server - 25 meter UTP - switch - 25 meter UTP - server
Imagine bringing this into metro with 1-2ms delay instead of 0.1-0.5ms.
This is one of the issues that the server/storage people have to deal
with.
--
Mikael Abrahamsson email: swmike@swm.pp.se
