Hello linux-raid team. I have a reshape operation that is stuck and refuses to respond to commands. I'm wondering what my options are to safely get it moving again. Background: I added two new partitions to a RAID 5 array, using a backup-file on a separate device: # mdadm --add /dev/md4 /dev/sdb4 /dev/sdd4 mdadm: added /dev/sdb4 mdadm: added /dev/sdd4 # mdadm --grow --raid-devices=10 --backup-file=/home/gwr/c/md4_backup__2017-01-25 /dev/md4 mdadm: Need to backup 32256K of critical section.. # cat /proc/mdstat Personalities : [raid1] [raid6] [raid5] [raid4] [...] md4 : active raid5 sdd4[13](R) sdb4[12] sdg4[10] sdi4[8] sdl4[9] sdf4[1] sdj4[7] sdh4[2] sde4[0] sdk4[11] 13454923776 blocks super 1.1 level 5, 512k chunk, algorithm 2 [10/9] [UUUUUUUUU_] [>....................] reshape = 0.8% (16715456/1922131968) finish=965.4min speed=32892K/sec The reshape proceeded normally until it hit 77.5%, where it has been stuck for the last couple of days: # cat /proc/mdstat Personalities : [raid1] [raid6] [raid5] [raid4] md4 : active raid5 sdd4[13](R) sdb4[12] sdg4[10](F) sdi4[8] sdl4[9] sdf4[1] sdj4[7] sdh4[2] sde4[0] sdk4[11] 13454923776 blocks super 1.1 level 5, 512k chunk, algorithm 2 [10/9] [UUUU_UUUU_] [===============>.....] reshape = 77.5% (1490403328/1922131968) finish=2544246.9min speed=2K/sec The backup file was last accessed at about the time I started the reshape: -rw-------. 1 root root 33034240 Jan 25 11:52 md4_backup__2017-01-25 I tried to idle the RAID reshape, but the "echo" command just hung: # cd /sys/block/md4/md # echo idle > sync_action I can get some data from the files in this directory, though: # cat reshape_direction forwards # cat reshape_position 26825379840 I tried to pull mdadm data about this array to add to this post, but that command also hung: # mdadm --misc --examine /dev/md4 The server CPU load is pegged, with md4_raid5 as the top CPU hog. What are my safe alternatives here? Can I safely reboot without corrupting the reshape? How can I get the reshape unstuck? -- George Rapp (Pataskala, OH) Home: george.rapp -- at -- gmail.com LinkedIn profile: https://www.linkedin.com/in/georgerapp Phone: +1 740 936 RAPP (740 936 7277) -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
