From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stan Hoeppner Subject: Re: RAID5 created by 8 disks works with xfs Date: Sun, 01 Apr 2012 22:12:46 -0500 Message-ID: <4F79192E.9020909@hardwarefreak.com> References: <4F776492.4070600@hardwarefreak.com> <4F77D0B2.8000809@hardwarefreak.com> <4F77EA55.6090004@hardwarefreak.com> Reply-To: stan@hardwarefreak.com Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-raid-owner@vger.kernel.org To: daobang wang Cc: =?ISO-8859-1?Q?Mathias_Bur=E9n?= , linux-raid List-Id: linux-raid.ids On 4/1/2012 1:20 AM, daobang wang wrote: > I have the different opinion, the application does not write the disk > directly, disk IOs will be merged before writen in kernel, just we can > not caculate how many IOs will be merged. Your original workload description was writing 200 or 100 video streams to 200 or 100 different files in parallel. What you state above is different than the original. Maybe you could give us a little more detail about how this application actually does its file IO. -- Stan