From mboxrd@z Thu Jan 1 00:00:00 1970 From: Kelly Byrd Subject: Re: Different sized disks for RAID1+0 or RAID10. Date: Thu, 11 Oct 2007 09:15:12 -0700 Message-ID: References: <470E435C.2090703@tmr.com> Reply-To: kbyrd-linuxraid@memcpy.com Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <470E435C.2090703@tmr.com> Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids On Thu, 11 Oct 2007 11:38:04 -0400, Bill Davidsen wrote: > Kelly Byrd wrote: >> I've currently got a pair of identical drives in a RAID1 set for >> my data partition. I'll be getting a pair of bigger drives in a >> bit, and I was wondering if I could RAID1 those (of course) and >> then RAID0 the two differently sized mds. Even better, will RAID10 >> let me do this? >> > > RAID-10 will let you do this, read past threads of this list for > discussion of using the "far" option to gain performance. >> I don't need to grow the current RAID1 into this new beast, I've >> got a place I can copy the existing data so I can start from >> scratch. >> Doesn't the 'far' option trade write performance to gain read performance? This is a desktop, not at all a "mostly read" type workload. >> I imagine the answer is: "sure RAID10 / RAID0 let's you do this, >> but you don't get the striping performance benefit" for some of >> the data", which would be ok with me until the smaller drives go >> bad and I replace them. >> > > Replacing the smaller drives could be an adventure if you plan to go to > larger replacement drives. I don't recall the issues involved with using > larger partitions and RAID-10, there's another issue for you to research. > Will do.