From mboxrd@z Thu Jan 1 00:00:00 1970 From: Timo Boettcher Subject: Re: What raid to build on that drives? Date: Wed, 26 Nov 2003 22:08:14 +0100 Sender: linux-raid-owner@vger.kernel.org Message-ID: <13534683912.20031126220814@gmx.net> References: <3229206566.20031126203657@gmx.net> <4697.206.81.129.218.1069876742.squirrel@eglifamily.dnsalias.net> Reply-To: Timo Boettcher Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <4697.206.81.129.218.1069876742.squirrel@eglifamily.dnsalias.net> To: linux-raid@vger.kernel.org List-Id: linux-raid.ids Hi Dan, * Dan Egli , Wednesday, November 26, 2003, 8:59:02 PM: >> Hi, >> >> I have 3 * 36GB discs and 5 * 18GB discs on two u160 scsi channels? >> What possibilities do I have to build a raid on them? I want to be >> able to survive one failed disc, but get as much space and >> performance out of the discs as possible. >> > Best I can suggest is a raid 5. You'll get 72GB of space, good performance > (roughly what you'd get from a sigle drive), and if one of the drives goes > south, the other two will keep your raid set up till the drive can be > replaced. I hoped to integrate all discs in that raid.... I tried to run raid0 over pairs of the 18GB discs (leavin the fifth as spare) and run a raid 5 over these raid0's and the three 36gb drives, but that gives me 50mb/s reading as opposed to 100mb/s with 8*18GB raid5 on the same machine (three of these discs failed, so I got bigger ones). Why did I loose that much performance? Timo