From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Greaves Subject: Re: readahead (blockdev --setra) with sw raid(5)? Date: Sat, 27 Nov 2004 23:52:29 +0000 Message-ID: <41A9133D.5000809@dgreaves.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-raid-owner@vger.kernel.org To: Stephan van Hienen Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids I routinely use --setra 4096 on the underlying devices, the md array devices and the lvm devices I am generally reading 1-2 gigabyte files. I use XFS and it is often suggested as a good fs (though I think there may be some XFS/nfs issues with 2.6 at the moment - see lkml) David Stephan van Hienen wrote: > Hi, > > just saw a 3ware document with some hints for hardware raid5 > they advice to use blockdev --setra 16384 > > since i'm not using 3ware hardware raid > (i'm using 2*7500 3ware's with sw raid5 over 14 disks) > i'm wondering if --setra can still improve my raid performance > > any hints about this ? > or some other hints, improvements on filesystem ? > i'm currently using blocksize 128, maybe switching to 256 helps ? > (with large files) > - > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html >