From mboxrd@z Thu Jan 1 00:00:00 1970 From: Keld =?iso-8859-1?Q?J=F8rn?= Simonsen Subject: Re: Benchmarks: Linux Kernel RAID vs a Hardware RAID setup Date: Wed, 16 Jul 2008 10:17:12 +0200 Message-ID: <20080716081712.GA9365@rap.rap.dk> References: <1216130769.5633.318.camel@sam.localdomain> <20080715163932.GA23164@rap.rap.dk> <8CAB4B2168C7183-B68-AD2@webmail-ng19.sysops.aol.com> <20080715173927.GA24745@rap.rap.dk> <487D3A44.7000008@sauce.co.nz> <20080716042336.GB7148@rap.rap.dk> <487D84B6.60908@sauce.co.nz> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Content-Disposition: inline In-Reply-To: <487D84B6.60908@sauce.co.nz> Sender: linux-raid-owner@vger.kernel.org To: Richard Scobie Cc: Linux RAID Mailing List List-Id: linux-raid.ids On Wed, Jul 16, 2008 at 05:18:46PM +1200, Richard Scobie wrote: > Keld J=F8rn Simonsen wrote: >=20 > >My understanding tho, is that the IO output and input figures are on > >sequential IO. There are no figures on random IO, >=20 > If you look at some results Justin posted: >=20 > http://home.comcast.net/~jpiszcz/20080707/veliciraptors_with_x4.html >=20 > The column "Random Create" shows performance for randomly creating,=20 > reading and deleting 16384 files sized between 16bytes and 1MB=20 > distributed randomly through 64 directories (this is the -n parameter= =20 > and is shown in the "Num Files" column.) Yes, but these are not random IO in the sense that I meant it, which wa= s unclear. These are specific system calls, delete, and seeks, with some = IO=20 on the inodes and maybe releasing blocks to the empty block list. I meant to say: There are no tests in bonnie++ that measures random read and write thruput. best regards keld -- To unsubscribe from this list: send the line "unsubscribe linux-raid" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html