From mboxrd@z Thu Jan 1 00:00:00 1970 From: Bernd Schubert Subject: Re: Performance problems with 3ware 9500S-4LP and 2.6.25-rc3 Date: Tue, 26 Feb 2008 18:54:19 +0100 Message-ID: <200802261854.19980.bs@q-leap.de> References: <20080226174314.GA30767@skl-net.de> Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-15" Content-Transfer-Encoding: 7bit Return-path: Received: from ns1.q-leap.de ([153.94.51.193]:54285 "EHLO mail.q-leap.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1761878AbYBZRyW (ORCPT ); Tue, 26 Feb 2008 12:54:22 -0500 In-Reply-To: <20080226174314.GA30767@skl-net.de> Content-Disposition: inline Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: Andre Noll Cc: adam radford , Tony Battersby , Johannes =?iso-8859-15?q?W=F6rner?= , James Bottomley , linux-scsi , linux-kernel 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