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

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Date:	Tue, 26 Feb 2008 18:54:19 +0100
From:	Bernd Schubert <bs@...eap.de>
To:	Andre Noll <maan@...temlinux.org>
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

Hello Andre,

On Tuesday 26 February 2008 18:43:14 Andre Noll wrote:
> Hi
>
> we are experiencing massive performance problems with two of our
> Linux servers that contain 3ware controllers on a Tyan mainboard and
> a couple of 1T disks.
>
> 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.

do you have the write-back cache of the controller enabled for your disks? 
When you disable this cache, the controller will also disable the disks, 
cause a write-performance between 3 to 8MB/s per disks.

Cheers,
Bernd


-- 
Bernd Schubert
Q-Leap Networks GmbH
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