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Subject: RE: Poor NFS performance.  Dell Ethernet Switches.
Date: Fri, 20 Apr 2007 02:59:12 -0700
Message-ID: <BB375AF679D4A34E9CA8DFA650E2B04E0351C1BA@onstor-exch02.onstor.net>
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Thread-Topic: Poor NFS performance.  Dell Ethernet Switches.
Thread-Index: AceC+fKJyXNbIqPBSQ2eWS3xFi245AAAiIg2AA1ycyA=
References: <BB375AF679D4A34E9CA8DFA650E2B04E0346A33F@onstor-exch02.onstor.net>
From: "Tim O'Callaghan" <tim.ocallaghan@onstor.com>
To: "John Culp" <john.culp@onstor.com>
Cc: "dl-cstech" <dl-cstech@onstor.com>,
	"John Rogers" <john.rogers@onstor.com>

John,

From my experience of the Dell switches, especially the later ones - the
command is almost identical to the Cisco "channel-group" rather than
"port group"(it is the same code base I believe)

channel-group <# group id number> mode on

Mode "on" forces channel group membership with no LACP

Regards

Tim



-----Original Message-----
From: John Rogers=20
Sent: 20 April 2007 04:29
To: John Culp; dl-cstech
Subject: Re: Poor NFS performance. Dell Ethernet Switches.

Lacp is not supposed to work. I would suspect that any lacp config on a
dell switch would cause packet loss. That will kill performance. =20

I have several dell's in the lab. I'll need to review the aggregation
setup. But its really similar to cisco on the command line use ether
channel groups and set them to mode on.=20

John

-----Original Message-----
From: John Culp
To: dl-cstech
Sent: Thu Apr 19 20:14:03 2007
Subject: Poor NFS performance.  Dell Ethernet Switches.

IHAC that is seeing really poor NFS performance.  They are using a
Xyratech array that I know is capable of good performance (not the new
one that does not work).  I am curious if anyone has a customer using
Dell Ethernet switches?  The LACP never works, Trunking is difficult and
it just seems to be the slow down.
=20
We are doing a dd to the filer via a NFS client and Performance is 50 MB
for 4 seconds and then drops to 10MB.
=20
Any thoughts?
=20
John Culp=20
Sr System Engineer
john.culp@onstor.com <mailto:john.culp@onstor.com>=20
office: 940-239-7489
cell: 972-523-4287
ONStor, Inc.
NAS for Enterprise
3311 Chalkstone Cove| Corinth, TX 76208
main: 940-239-7489 | fax: 940-239-7527=20
=20
