From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932747AbWGBSuJ (ORCPT ); Sun, 2 Jul 2006 14:50:09 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932754AbWGBSuJ (ORCPT ); Sun, 2 Jul 2006 14:50:09 -0400 Received: from embla.aitel.hist.no ([158.38.50.22]:9102 "HELO embla.aitel.hist.no") by vger.kernel.org with SMTP id S932747AbWGBSuH (ORCPT ); Sun, 2 Jul 2006 14:50:07 -0400 Date: Sun, 2 Jul 2006 20:46:04 +0200 To: Reuben Farrelly Cc: linux-kernel@vger.kernel.org, neilb@cse.unsw.edu.au Subject: Re: 2.6.17-mm4 raid bugs & traces Message-ID: <20060702184604.GA497@aitel.hist.no> References: <20060629013643.4b47e8bd.akpm@osdl.org> <20060701111153.GA10855@aitel.hist.no> <20060701162532.GA14933@aitel.hist.no> <44A75BE0.2090604@reub.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <44A75BE0.2090604@reub.net> User-Agent: Mutt/1.5.11+cvs20060403 From: Helge Hafting Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Sun, Jul 02, 2006 at 05:38:40PM +1200, Reuben Farrelly wrote: > On 2/07/2006 4:25 a.m., Helge Hafting wrote: > >More mm4 raid-1 troubles. > > >More than a little irritating, I need the SATA raid-1 to be in sync > >so lilo can install mm5 for me. 18 hours. > > Have you looked at enabling write-intent bitmaps on your raid-1 arrays? > Didn't know about those. I solved this by rebooting into 2.6.16-rc6-mm2, where the resync is one hour. 2.6.15 must have bad SATA drivers. > With all the grief I have been having with RAID-1 recently, bitmaps have > saved me very very serious amounts of time resyncing the array. > > Typically after my raid array has had devices/partitions kicked out (such > as when loading -mm5) it takes only 2-3 seconds to bring each non-fresh > device/partition back into the array and back up to sync (as opposed to 18 > hours...). > > Neil wrote a good posting at http://lkml.org/lkml/2005/12/4/118 about it > (which should be a FAQ entry in itself). Thanks for the tip. I now have write intent bitmaps enabled on all my arrays. Helge Hafitng