From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?ISO-8859-15?Q?Stefan_/*St0fF*/_H=FCbner?= Subject: Re: Optimize RAID0 for max IOPS? Date: Wed, 19 Jan 2011 09:18:53 +0100 Message-ID: <4D369E6D.8020604@stud.tu-ilmenau.de> References: <20110118210112.D13A236C@gemini.denx.de> <4D361F26.3060507@stud.tu-ilmenau.de> <20110119071138.7B2D02FC@gemini.denx.de> Reply-To: stefan.huebner@stud.tu-ilmenau.de Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20110119071138.7B2D02FC@gemini.denx.de> Sender: linux-raid-owner@vger.kernel.org To: Wolfgang Denk Cc: Roberto Spadim , linux-raid@vger.kernel.org List-Id: linux-raid.ids Am 19.01.2011 08:11, schrieb Wolfgang Denk: > Dear Roberto Spadim, > > In message you wrote: >> maybe removing hwraid and using swraid may reduce speed (depend how >> much cpu you use with hw and with sw) >> what we can optimize? less I/O per seconds making as much useful >> read/write data on array, how? good read/write algorithms for raid. >> (for each device type, ssd, hd) but... like stefan, disks are your >> bottleneck > > No, they are not. Run some benchmarks yourself if you don't believe > me. Lol - I wouldn't have answered in the first place if I didn't have any expertise. So suit yourself - as you don't bring up any real numbers (remember: you've got the weird setup, you asked, you don't have enough money for the enterprise solution - so ...) nobody who worked with 3ware controllers will believe you. > > Even a single disk drive is performing better than the hw RAID under > this workload. Well - that is the problem - simulate YOUR workload. Actually I fear at least one of your disks has a grown defect, which slows down / blocks i/o. Haven't seen any 9650SE RAID being slower than the same config in a software raid. > > Best regards, > > Wolfgang Denk >