From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andreas Klauer Subject: Re: recovering failed and unrecognizable RAID5 during mdadm --grow without backup Date: Fri, 13 May 2016 16:39:23 +0200 Message-ID: <20160513143923.GA23787@EIS.leimen.priv> References: <1b26650f-0b2c-2485-f781-e3fd26340741@misalpina.net> <5734D23D.6030400@turmel.org> <5734E637.6030307@turmel.org> <7cf56631-7909-6a92-f0b2-05dd02722ee8@misalpina.net> <5735DF05.8080706@turmel.org> <5735E07F.2030802@turmel.org> <3b4ae5f5-af19-744b-cab3-aad317ea3a82@misalpina.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <3b4ae5f5-af19-744b-cab3-aad317ea3a82@misalpina.net> Sender: linux-raid-owner@vger.kernel.org To: Claudiu Rad-Lohanel Cc: Phil Turmel , linux-raid@vger.kernel.org List-Id: linux-raid.ids On Fri, May 13, 2016 at 05:26:02PM +0300, Claudiu Rad-Lohanel wrote: > 1. i can't find any documentation anywhere about the --revert-reshape > option. how should the command look like? is it available in v3.3.2? IIRC it's --assemble --update=revert-reshape and it's not mentioned in the man page... > 2. is it safe? Theoretically... You could do this with overlays. https://raid.wiki.kernel.org/index.php/Recovering_a_failed_software_RAID#Making_the_harddisks_read-only_using_an_overlay_file That's what I'd also recommend when running fsck... all of these things write on your disks without providing an undo function. Regards Andreas Klauer