From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wols Lists Subject: Re: mdadm RAID6 "active" with spares and failed disks; need help Date: Mon, 12 Jan 2015 16:35:57 +0000 Message-ID: <54B3F7ED.1000809@youngman.org.uk> References: <54ABEE54.6020707@sympatico.ca> <54B305B2.6000702@lentijn.sess.ink> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <54B305B2.6000702@lentijn.sess.ink> Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids On 11/01/15 23:22, Valentijn Sessink wrote: > Also, I would not have dared to run all these statements on "live" (or > dead, for that matter ;-) disks. I'm no expert either, but looking at the blog, I'm worried he might have trashed the array with almost the first thing he did :-( "add" says it will add a drive as spare if it didn't originally belong to the array. If it adds a spare to a degraded array, the array will immediately start to repair itself. OOPS!!! As it sounds like exactly this could have happened - mdadm didn't recognise the disk as it added it. Just speculating, but unfortunately this seems quite likely :-( Cheers, Wol