On Mon, 26 Aug 2013 13:38:43 +0200 Iruwen <iruwen@xxxxxxx> wrote: > Hi, > > the disk holding backup-file unfortunately died during an mdadm --grow > /dev/md0 --level=6 --raid-devices=4 --backup-file=/mnt/backup/md0.bak. > The speed of the reshape dropped to 0K/sec, apart from that the RAID > seems fine. > > > Personalities : [raid6] [raid5] [raid4] > md0 : active raid6 sda1[4] sdc1[2] sdd1[3] sdb1[1] > 2930271232 blocks super 1.2 level 6, 512k chunk, algorithm 18 > [4/3] [UUU_] > [==========>..........] reshape = 53.6% (786497536/1465135616) > finish=55405950.5min speed=0K/sec > > unused devices: <none> > > > /dev/md0: > Version : 1.2 > Creation Time : Fri Feb 11 21:10:18 2011 > Raid Level : raid6 > Array Size : 2930271232 (2794.52 GiB 3000.60 GB) > Used Dev Size : 1465135616 (1397.26 GiB 1500.30 GB) > Raid Devices : 4 > Total Devices : 4 > Persistence : Superblock is persistent > > Update Time : Mon Aug 26 13:32:09 2013 > State : clean, degraded, recovering > Active Devices : 3 > Working Devices : 4 > Failed Devices : 0 > Spare Devices : 1 > > Layout : left-symmetric-6 > Chunk Size : 512K > > Reshape Status : 53% complete > New Layout : left-symmetric > > Name : backup:0 (local to host backup) > UUID : 832a100a:2996471b:51867bfa:aaf5c38f > Events : 1053146 > > Number Major Minor RaidDevice State > 3 8 49 0 active sync /dev/sdd1 > 1 8 17 1 active sync /dev/sdb1 > 2 8 33 2 active sync /dev/sdc1 > 4 8 1 3 spare rebuilding /dev/sda1 > > > What's the right thing to do now, is this recoverable? I have backups of > course and since the RAID is still working I could just copy everything > off and recreate it, but I'd rather fix this the "right way" than to set > up a new system. You should be able to simply stop the array and re-assemble with a different backup file and the magic flag "--invalid-backup" (required mdadm 3.2 or later). The backup-file is only really needed in case of a crash. As you will stop the array cleanly there will be no need to recover anything when you re-assemble, so --invalid-backup (Which say "there is nothing in the backup file, but that is OK) is perfectly safe. NeilBrown
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