From mboxrd@z Thu Jan 1 00:00:00 1970 From: Goswin von Brederlow Subject: Re: raid failure and LVM volume group availability Date: Tue, 26 May 2009 13:05:59 +0200 Message-ID: <87ws84nmy0.fsf@frosties.localdomain> References: <389deec70905250909h79c599b2gfd2229520f5a8ce0@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: In-Reply-To: <389deec70905250909h79c599b2gfd2229520f5a8ce0@mail.gmail.com> (hank peng's message of "Tue, 26 May 2009 00:09:25 +0800") Sender: linux-raid-owner@vger.kernel.org To: hank peng Cc: Tim Connors , linux-raid@vger.kernel.org, dm-devel@redhat.com List-Id: linux-raid.ids hank peng writes: > Only one of disks in this RAID1failed, it should continue to work with > degraded state. > Why LVM complained with I/O errors?? That is because the last drive in a raid1 can not fail: md9 : active raid1 ram1[1] ram0[2](F) 65472 blocks [2/1] [_U] # mdadm --fail /dev/md9 /dev/ram1 mdadm: set /dev/ram1 faulty in /dev/md9 md9 : active raid1 ram1[1] ram0[2](F) 65472 blocks [2/1] [_U] See, still marked working. MfG Goswin PS: Why doesn't mdadm or kernel give a message about not failing?