From mboxrd@z Thu Jan 1 00:00:00 1970 From: Keld =?iso-8859-1?Q?J=F8rn?= Simonsen Subject: Re: [PATCH md] Speed up raid10 resync, especially for 'far' layout Date: Tue, 5 Aug 2008 15:22:45 +0200 Message-ID: <20080805132245.GA17635@rap.rap.dk> References: <20080805101429.GA16040@rap.rap.dk> 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: Sender: linux-raid-owner@vger.kernel.org To: Jon Nelson Cc: LinuxRaid List-Id: linux-raid.ids On Tue, Aug 05, 2008 at 06:53:12AM -0500, Jon Nelson wrote: > On Tue, Aug 5, 2008 at 5:14 AM, Keld J=F8rn Simonsen = wrote: > > Speed up raid10 resync, especially for 'far' layout > > > > This patch speeds up resync for raid10, especially for the 'far' > > layout, where reading is done in 32 MiB increments and the moving o= f > > heads is therefore much reduced compared to the previous 2 MiB size= , > > nd the 'far' property of striping read can be employed. > > > > A speed up of more than 50 % has been reported. >=20 > Actually, the time taken to 'check' the array was reduced by more tha= n 50%. Which corresponds to a speed up of more than 100 %. Did you have any indications on whether there would still be room for improvements? What was the speed on the individual disks compared to their nominal speed? 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