Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1765969AbXFSULj (ORCPT ); Tue, 19 Jun 2007 16:11:39 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1763396AbXFSULO (ORCPT ); Tue, 19 Jun 2007 16:11:14 -0400 Received: from caffeine.uwaterloo.ca ([129.97.134.17]:40193 "EHLO caffeine.csclub.uwaterloo.ca" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1761233AbXFSULM (ORCPT ); Tue, 19 Jun 2007 16:11:12 -0400 Date: Tue, 19 Jun 2007 16:11:11 -0400 To: david@lang.hm Cc: Wakko Warner , Brendan Conoboy , Neil Brown , linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org Subject: Re: limits on raid Message-ID: <20070619201111.GQ10008@csclub.uwaterloo.ca> References: <4676BEC2.7090809@redhat.com> <20070618180327.GP10008@csclub.uwaterloo.ca> <20070618183324.GL10006@csclub.uwaterloo.ca> <4676D8DE.3050903@redhat.com> <20070618214633.GA15468@animx.eu.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.13 (2006-08-11) From: lsorense@csclub.uwaterloo.ca (Lennart Sorensen) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1030 Lines: 23 On Mon, Jun 18, 2007 at 02:56:10PM -0700, david@lang.hm wrote: > yes, I'm useing promise drive shelves, I have them configured to export > the 15 drives as 15 LUNs on a single ID. > > I'm going to be useing this as a huge circular buffer that will just be > overwritten eventually 99% of the time, but once in a while I will need to > go back into the buffer and extract and process the data. I would guess that if you ran 15 drives per channel on 3 different channels, you would resync in 1/3 the time. Well unless you end up saturating the PCI bus instead. hardware raid of course has an advantage there in that it doesn't have to go across the bus to do the work (although if you put 45 drives on one scsi channel on hardware raid, it will still be limited). -- Len Sorensen - 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/