From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Fri, 29 Jun 2001 16:16:09 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Fri, 29 Jun 2001 16:15:59 -0400 Received: from [64.68.77.148] ([64.68.77.148]:8335 "EHLO mta05.onebox.com") by vger.kernel.org with ESMTP id ; Fri, 29 Jun 2001 16:15:44 -0400 Date: Fri, 29 Jun 2001 13:15:31 -0700 Subject: raid + xfs Reply-To: jonathan.bright@onebox.com From: "jonathan bright" To: linux-kernel@vger.kernel.org MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="1BoxPartBoundary99384573110413993845731" Message-Id: <20010629201531.BNAU10107.mta05.onebox.com@onebox.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org This is a multi-part message in MIME format. --1BoxPartBoundary99384573110413993845731 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Content-Disposition: inline hi. i'm using xfs on top of raid, and have noticed some unusual behavior. my basic hardware configuration is 850 p3, intel d815eea2 motherboard, 4 ibm drives, 2 promise cards, and a separate drive on built in ide channel as the root (this was not the initial configuration, but kind of evolved as we went ahead.) what we noticed was that the resyncing speed as reported by cat /proc/mdstat was originally 100k/sec, making resyncing take forever. we bumped /proc/sys/dev/raid up, and got resyncing to around 3000k/sec, with 90% cpu usage for raid5sync. then i decided to run the bonnie benchmark, and *while* bonnie was running, resyncing went up to 10000k, with low CPU usage. when bonnie finised, resyncing started to behave badly again. (and bonnie's performance wasn't noticably impacted by the resyncing either). perhaps in a few weeks i might be able to investigate the raid code, but i'm hoping that someone might know what is causing this behavior. please CC me at jonathan.bright@onebox.com if you reply. thanks, jon bright -- jonathan bright jonathan.bright@onebox.com 415.820.7322 - voicemail/fax www.brightconsulting.com --1BoxPartBoundary99384573110413993845731 Content-type: application/octet-stream; charset=us-ascii Content-Transfer-Encoding: base64 Content-Disposition: attachment DQo= --1BoxPartBoundary99384573110413993845731 Content-type: application/octet-stream; charset=us-ascii Content-Transfer-Encoding: base64 Content-Disposition: attachment DQo= --1BoxPartBoundary99384573110413993845731 Content-type: application/octet-stream; charset=us-ascii Content-Transfer-Encoding: base64 Content-Disposition: attachment DQo= --1BoxPartBoundary99384573110413993845731--