From mboxrd@z Thu Jan 1 00:00:00 1970 From: Xiao Ni Subject: Re: indefinite hang when growing/reshaping Date: Fri, 19 Dec 2014 03:14:47 -0500 (EST) Message-ID: <997573837.677557.1418976887168.JavaMail.zimbra@redhat.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: Sender: linux-raid-owner@vger.kernel.org To: Chris Murphy Cc: linux-raid@vger.kernel.org, eguan@redhat.com, Jes Sorensen List-Id: linux-raid.ids Hi all There is the same problem. I can reproduce with the same steps. And I can reproduce this in a different way too. I don't know whether it's the same problem, but the result is the same. The different steps are as follows: mdadm -CR /dev/md0 -l5 -n7 /dev/sda1 /dev/sdb1 /dev/sdc1 /dev/sdd1 /dev/sde1 /dev/sdf1 /dev/sdh1 -x1 /dev/sdi1 --assume-clean --bitmap=internal mdadm --grow -l0 /dev/md0 --backup-file=tmp0 cat /proc/mdstat Personalities : [raid6] [raid5] [raid4] [raid1] [raid0] md0 : active raid5 loop3[4] loop2[3] loop1[1] loop0[0] 2045952 blocks super 1.2 level 5, 512k chunk, algorithm 2 [4/4] [UUUU] [>....................] reshape = 0.0% (0/1022976) finish=5.8min speed=2818K/sec unused devices: There is speed 2818K/sec, but if you look by iostat, there is no speed about the disks. And there is a workaround: mdadm -CR /dev/md0 -l5 -n7 /dev/sda1 /dev/sdb1 /dev/sdc1 /dev/sdd1 /dev/sde1 /dev/sdf1 /dev/sdh1 -x1 /dev/sdi1 --assume-clean --bitmap=internal mdadm --grow -l0 /dev/md0 If we don't specify the backup file. The reshape can finish correctly. Best Regards Xiao ----- Original Message ----- > From: "Chris Murphy" > To: linux-raid@vger.kernel.org > Sent: Thursday, December 18, 2014 6:20:50 AM > Subject: indefinite hang when growing/reshaping > > If this is user error I'd expect a discreet error message, but I don't > get one, just a hang during the reshape following successful --grow > command (going from 3x device raid5 to 4x device raid5). > > # cat /proc/mdstat > Personalities : [raid6] [raid5] [raid4] > md127 : active raid5 loop3[4] loop2[3] loop1[1] loop0[0] > 2095104 blocks super 1.2 level 5, 512k chunk, algorithm 2 [4/4] [UUUU] > [>....................] reshape = 0.0% (0/1047552) > finish=7.0min speed=2402K/sec > > Reproduces with: > kernel-3.17.6-300.fc21.x86_64 > mdadm-3.3.2-1.fc21.x86_64 > and > 3.18.0-2.fc22.i686+debug > mdadm-3.3.2-1.fc21.i686 > > Details are here: > https://bugzilla.kernel.org/show_bug.cgi?id=89851 > > -- > Chris Murphy > -- > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html >