From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jan Ceuleers Subject: Spare disk periodically woken up Date: Wed, 28 Jan 2009 20:58:43 +0100 Message-ID: <4980B8F3.40502@computer.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids Hi there. I'm very sorry if this is an FAQ; I've searched the wiki but have not been able to find the answer. I have five disks, four of which form a RAID5 set, with the fifth being a spare. This fifth disk is normally spun down, or at least it should be. (It's a bit more complicated than that, as is evident from the info included below, but this is essentially it). I recently noticed that this fifth disk is periodically spun up for reasons unknown. It's not due to SMART monitoring because I've disabled the SMART daemon altogether. My /proc/mdstat is shown below; the disk that is periodically spun up is /dev/sdf. How can I find out what is causing my standby disk to spin up? Many thanks. Cheers, Jan ========= /proc/mdstat Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] md2 : active raid5 sdf2[4](S) sda2[0] sdd2[3] sdc2[2] sdb2[1] 934765824 blocks level 5, 64k chunk, algorithm 2 [4/4] [UUUU] md1 : active raid1 sdb1[0] sdd1[1] 979840 blocks [2/2] [UU] md0 : active raid1 sdf1[2](S) sda1[0] sdc1[1] 979840 blocks [2/2] [UU] unused devices: