Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1764012AbYBZRyc (ORCPT ); Tue, 26 Feb 2008 12:54:32 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1762358AbYBZRyX (ORCPT ); Tue, 26 Feb 2008 12:54:23 -0500 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 From: Bernd Schubert To: Andre Noll Subject: Re: Performance problems with 3ware 9500S-4LP and 2.6.25-rc3 Date: Tue, 26 Feb 2008 18:54:19 +0100 User-Agent: KMail/1.9.6 (enterprise 0.20070907.709405) Cc: adam radford , Tony Battersby , Johannes =?iso-8859-15?q?W=F6rner?= , James Bottomley , linux-scsi , linux-kernel References: <20080226174314.GA30767@skl-net.de> In-Reply-To: <20080226174314.GA30767@skl-net.de> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-15" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200802261854.19980.bs@q-leap.de> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1151 Lines: 32 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/