From mboxrd@z Thu Jan 1 00:00:00 1970 From: Luca Berra Subject: Re: Re: [Consult-list] dm-multipath has great throughput but we'd like more! Date: Thu, 18 May 2006 09:44:53 +0200 Message-ID: <20060518074452.GD26035@percy.comedia.it> References: <1147935929.27006.57.camel@baggage> <1147936749.27006.59.camel@baggage> <20060518072749.GC26035@percy.comedia.it> <2102bdeb4bf689abbe069a61be3e2a8e@redhat.com> Reply-To: device-mapper development Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Return-path: Content-Disposition: inline In-Reply-To: <2102bdeb4bf689abbe069a61be3e2a8e@redhat.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com To: dm-devel@redhat.com List-Id: dm-devel.ids On Thu, May 18, 2006 at 02:36:00AM -0500, Jonathan E Brassow wrote: > >On May 18, 2006, at 2:27 AM, Luca Berra wrote: > >>On Thu, May 18, 2006 at 08:19:09AM +0100, Bob Gautier wrote: >>>On Thu, 2006-05-18 at 08:05 +0100, Bob Gautier wrote: >>>>Yesterday my client was testing of multipath load balancing and >>>>failover >>>>on a system running ext3 on a logical volume which comprises about >>>>ten >>>>SAN LUNs all reached using multipath in multibus mode over two QL2340 >>>>HBAs. >>> >>>Sorry, should have also said: RHEL4u3 x86_64 on DL385 with 16Gb memory >>> >>you could have added the storage model :) >>btw did you do any tuning (i.e. readhaead, scheduler) ? >> > >You may also want to do raw through-put testing (lmdd perhaps) to get a >baseline. Certainly, the file system has to be bringing down the >bandwidth somewhat... > in some cases even the partition alignment might introduce delays. L. -- Luca Berra -- bluca@comedia.it Communication Media & Services S.r.l. /"\ \ / ASCII RIBBON CAMPAIGN X AGAINST HTML MAIL / \