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

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Message-ID: <20080227101143.GC30767@skl-net.de>
Date:	Wed, 27 Feb 2008 11:11:43 +0100
From:	Andre Noll <maan@...temlinux.org>
To:	Chris Snook <csnook@...hat.com>
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 13:33, Chris Snook 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.
> 
> You're putting your box under astronomical load.  This is generally 
> regarded as a bad idea, regardless of how well your storage controller 
> is performing.

The machine becomes sluggish also when I write directly to the raid
array. A simple

	dd if=/dev/zero of=tmpfile

shouldn't push the load up to 4, right?

> Can you measure the single-threaded throughput (say, 
> coping one huge file, and then syncing) to give us a baseline 
> performance figure?

Single threaded throughput seems to be ok (140M/s). The problem is
that the machine becomes unresponsive.

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

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