From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Stefan G. Weichinger" Subject: Re: from 2x RAID1 to 1x RAID6 ? Date: Wed, 08 Jun 2011 10:16:54 +0200 Message-ID: <4DEF2FF6.5060300@xunil.at> References: <4DEE6A11.1030205@xunil.at> <4DEECD61.4030909@anonymous.org.uk> Reply-To: lists@xunil.at Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <4DEECD61.4030909@anonymous.org.uk> Sender: linux-raid-owner@vger.kernel.org To: "linux-raid@vger.kernel.org" List-Id: linux-raid.ids Am 08.06.2011 03:16, schrieb John Robinson: > There may be a clever alternative, retaining single redundancy, if > you don't mind buying one more disc, which I'm guessing you might do > soon anyway as you're already 85% full. Or if not, it won't do too > much harm to have a spare drive sitting on a shelf. In fact I already have one ... but I can't use it as the 8 bays of that server are already fully used. I could only attach that drive temporarily with USB or so ... > You can convert a 2-drive RAID1 to a 2-drive RAID5, then add the new > drive to double the size of the array, resize the PV, then move the > PEs over from the other RAID1, then tear down that PV and RAID1, add > one or both of those drives into the RAID5 and grow it to a RAID6. > The only step at which you have a little less redundancy is while > you're running the 3-drive RAID5 (well, it's still 1 drive but > against 2 drives, instead of 1:1). Clever idea, yes ... but a rather long way somehow ... > On the other hand it might be easier to take a backup, which you > probably ought to do anyway! Yep, I assume it will be that way: mv data aside, new array, data back in ... Thanks anyway, Stefan