linux-kernel - Re: Performance problems with 3ware 9500S-4LP and 2.6.25-rc3

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Message-ID: <20080227101154.GD30767@skl-net.de>
Date:	Wed, 27 Feb 2008 11:11:54 +0100
From:	Andre Noll <maan@...temlinux.org>
To:	Arnd Hannemann <hannemann@...s.rwth-aachen.de>
Cc:	adam radford <aradford@...il.com>,
	Tony Battersby <tonyb@...ernetics.com>,
	Johannes Wörner 
	<johannes.woerner@...bingen.mpg.de>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	linux-scsi <linux-scsi@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: Performance problems with 3ware 9500S-4LP and 2.6.25-rc3

On 00:07, Arnd Hannemann wrote:

> > During the daily cron job that uses rsync to sync a 500G file system
> > from another machine to the raid on the 3ware controller the load
> > jumps up, and the machine becomes sluggish as hell. For example, an
> > ssh login to that machine takes minutes to complete and ldap becomes
> > unreliable while the rsync job is running. Even Nagios complains
> > about the machine being down while rsync is running.
> 
> Could you give some numbers, please?

What kind of numbers would you like to see?

> However there are some known issues:
> 
> http://forums.storagereview.net/index.php?showtopic=25923
> http://tumbleweed.org.za/2007/02/16/horrific-performance-with-3ware-raid

Thanks, this helped a lot. However, there does not seem to be a way
to make the system more responsive, which is really the problem we
are experiencing.

Andre
-- 
The only person who always got his work done by Friday was Robinson Crusoe

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