From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from welcomes-you.com ([144.76.218.113]:56502 "EHLO smtp.welcomes-you.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751767AbdKBIlS (ORCPT ); Thu, 2 Nov 2017 04:41:18 -0400 Subject: Re: Possible to mount this XFS at least temporarily to retrieve files? References: <20171025212955.GZ3666@dastard> From: Carsten Aulbert Message-ID: <013706b1-0ced-8d7c-6a0c-fc12bf918a46@aei.mpg.de> Date: Thu, 2 Nov 2017 09:41:14 +0100 MIME-Version: 1.0 In-Reply-To: <20171025212955.GZ3666@dastard> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-xfs-owner@vger.kernel.org List-ID: List-Id: xfs To: Dave Chinner Cc: linux-xfs@vger.kernel.org Hi Dave and all others who replied, I just realized I have not answered on list to thank you all for the analysis of his failure! On 10/25/17 23:29, Dave Chinner wrote: > > This is a pretty good indication that the RAID rebuild has > completely jumbled up the disks and the data on the disks during > the rebuild. *sigh* > It's a hardware raid controller that is having hardware problems > during a rebuild. I'd say your filesystem is completely screwed > because the rebuild went wrong and you have no way of knowing what > blocks are good and what aren't, nor even whether the RAID has been > assembled correctly after the failure. Hence even if you could mount > it, the data in the files is likely to be corrupt/incorrect > anyway... We will now replace these controllers with dumb SAS HBA and will try to keep the "raid" features at a different level (md+xfs and/or zfs) which hopefully will avoid this failure mode in the future. Until then, I think we are lucky as we do not have hot spares defined on these controllers as that would prohibit us to react properly and eliminate host I/O at a time of our choosing... Thanks a lot again! Cheers Carsten -- Dr. Carsten Aulbert, Max Planck Institute for Gravitational Physics, Callinstraße 38, 30167 Hannover, Germany Phone: +49 511 762 17185