Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1764656AbYBZXGe (ORCPT ); Tue, 26 Feb 2008 18:06:34 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756249AbYBZXG0 (ORCPT ); Tue, 26 Feb 2008 18:06:26 -0500 Received: from mta-2.ms.rz.RWTH-Aachen.DE ([134.130.7.73]:36942 "EHLO mta-2.ms.rz.rwth-aachen.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755924AbYBZXGZ (ORCPT ); Tue, 26 Feb 2008 18:06:25 -0500 Date: Wed, 27 Feb 2008 00:07:05 +0100 From: Arnd Hannemann Subject: Re: Performance problems with 3ware 9500S-4LP and 2.6.25-rc3 In-reply-to: <20080226174314.GA30767@skl-net.de> To: Andre Noll Cc: adam radford , Tony Battersby , =?ISO-8859-15?Q?Johannes_W=F6rner?= , James Bottomley , linux-scsi , linux-kernel Message-id: <47C49B99.1060707@nets.rwth-aachen.de> MIME-version: 1.0 Content-type: text/plain; charset=ISO-8859-15 Content-transfer-encoding: 7BIT X-IronPort-AV: E=Sophos;i="4.25,409,1199660400"; d="scan'208";a="52346124" References: <20080226174314.GA30767@skl-net.de> User-Agent: Thunderbird 2.0.0.6 (X11/20071022) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1467 Lines: 37 Andre Noll schrieb: > 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. Could you give some numbers, please? 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 Symptons are reasonable performance with large block ops, but really bad performance with small block ops. time (cp -a linux-2.6.24.2 linux-2.6.24.2b; sync) Gives me with some tuning 50 seconds here with a 9650SE in a 4 disk raid5 setup. (very bad, single disk will do it in <30s!!!) But reading and writing large files with large block sizes is usually beyond > 100 MB/s [snipped a lot] > Andre Best regards, Arnd -- 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/