From mboxrd@z Thu Jan 1 00:00:00 1970 From: Roman Mamedov Subject: Re: recovering failed raid5 Date: Sat, 29 Oct 2016 15:29:51 +0500 Message-ID: <20161029152951.62add3ca@natsu> References: <20161027160400.GA21042@metamorpher.de> <715b259f-1e56-9606-edc4-3e5c4d57744b@shenkin.org> <20161028133304.GA11564@metamorpher.de> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20161028133304.GA11564@metamorpher.de> Sender: linux-raid-owner@vger.kernel.org To: Andreas Klauer Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids On Fri, 28 Oct 2016 15:33:04 +0200 Andreas Klauer wrote: > On Fri, Oct 28, 2016 at 01:22:31PM +0100, Alexander Shenkin wrote: > > One remaining question: is sdc definitely toast? > > In my opinion a drive is toast starting from the very first reallocated/ > pending/uncorrectable sector, your drive has several of those and that's > only the ones the drive already knows about - there may be more. I'd say you are overly cautious on this. Yes there are drives for which one reallocated sector is a sign of the coming avalanche of them, but then there are also ones (e.g. my Hitachi 2TB) which work for years, over than period develop 3-5-7 reallocated sectors, and THAT'S IT, they just continue to work. And if there's an unreadable sector on rebuild as a drive found its 8th bad sector after 3 more years of perfect operation, that's not a problem either, because the setup they run in, is RAID6. (Not to compensate for this, but I wouldn't be running a 8-10 drive RAID5 in any case). -- With respect, Roman