From mboxrd@z Thu Jan 1 00:00:00 1970 From: John Robinson Subject: Re: My Thecus RAID-0 filesystem unmountable with mdadm. Please help. Date: Thu, 27 May 2010 11:39:53 +0100 Message-ID: <4BFE4BF9.9060708@anonymous.org.uk> References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-raid-owner@vger.kernel.org To: David Reniau , Linux RAID List-Id: linux-raid.ids On 27/05/2010 02:03, David Reniau wrote: > Dear Linux-RAID gurus, That's very kind of you but I'm no guru, just a user like yourself, though perhaps with a little more experience and I've hung around here a while because I like to know what goes on inside the black box. [...] > Similarly, IF the default chunk size (64K) i've been using so far with > mdadm happens to be different from the Thecus', would the above > tune2fs -l /dev/md0 command deliver results identical to the above > ones with the corrected Thecus chunk size applied via mdadm > --assemble? Could this parameter modification be sufficient to get my > RAID filesystem back and mountable? I don't know if the tune2fs info will be identical but it would be similar. You'll need to --create the array again with the corrected chunk size, not just --assemble it, but yes this on its own might very well be enough to get your filesystem back. Cheers, John.