From mboxrd@z Thu Jan 1 00:00:00 1970 From: Neil Brown Subject: Re: raid10 on three discs - few questions. Date: Thu, 7 Feb 2008 13:21:24 +1100 Message-ID: <18346.27428.521186.423248@notabene.brown> References: <20080203235043.3dbb6433@szpak> <18342.18975.229866.860765@notabene.brown> <47A9FFE1.5070001@tmr.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: message from Bill Davidsen on Wednesday February 6 Sender: linux-raid-owner@vger.kernel.org To: Bill Davidsen Cc: Janek Kozicki , linux-raid@vger.kernel.org List-Id: linux-raid.ids On Wednesday February 6, davidsen@tmr.com wrote: > > > > > >> 4. Would it be possible to later '--grow' the array to use 4 discs in > >> raid10 ? Even with far=2 ? > >> > >> > > > > No. > > > > Well.... if by "later" you mean "in five years", then maybe. But the > > code doesn't currently exist. > > > > That's a reason to avoid raid10 for certain applications, then, and go > with a more manual 1+0 or similar. Not really. You cannot reshape a raid0 either. > > Can you create a raid10 with one drive "missing" and add it later? I > know, I should try it when I get a machine free... but I'm being lazy today. Yes, but then the array would be degraded and a single failure could destroy your data. NeilBrown