From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeff Garzik Subject: Re: Life's too short ...(Raid 1 sync times) Date: Sun, 29 Feb 2004 14:40:13 -0500 Sender: linux-raid-owner@vger.kernel.org Message-ID: <4042401D.9010606@pobox.com> References: <40423D29.1050401@sauce.co.nz> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <40423D29.1050401@sauce.co.nz> To: Richard Scobie Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids Richard Scobie wrote: > I am in the process of benchmarking a 4 x 250GB on 3ware 7506 to try and > sort out the myriad of options for RAID and XFS, in order to get best > performance for my workload. > > I have tested with software RAID5 and have just attempted to do the same > for software RAID 10. Unfortunately, it is going to take 31000 minutes, > or around 21 days to sync this array and I wish to test 3 different > stripe sizes. Is there some way to allow more bandwidth for the sync up? > > The RAID 5 took 70 minutes and was allowed up 100MB/s of idle IO > bandwidth - RAID 1 seems to use < 200kB/s. > > While I am very pleased with the hardware RAID 10 result (98261kB write, > 97148kB read), I would prefer to use software RAID 10 for a few reasons, > if the performance is similar. The resync speed defaults to "nice and slow" IIRC... There should be some procfs tunable to increase the resync speed... Jeff