From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chris Snook Subject: Re: Performance problems with 3ware 9500S-4LP and 2.6.25-rc3 Date: Tue, 26 Feb 2008 13:33:36 -0500 Message-ID: <47C45B80.6090907@redhat.com> References: <20080226174314.GA30767@skl-net.de> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from mx1.redhat.com ([66.187.233.31]:42751 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756430AbYBZSdr (ORCPT ); Tue, 26 Feb 2008 13:33:47 -0500 In-Reply-To: <20080226174314.GA30767@skl-net.de> Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: Andre Noll Cc: adam radford , Tony Battersby , =?ISO-8859-1?Q?Johannes_W=F6rner?= , James Bottomley , linux-scsi , linux-kernel Andre Noll wrote: > 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. 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. Can you measure the single-threaded throughput (say, coping one huge file, and then syncing) to give us a baseline performance figure? rsync will happily peg your box, your network, and your cat if you let it. -- Chris