On Thu, Mar 16, 2017 at 10:14:04PM +0800, Zhilong Liu wrote: > hi, list; > > I just trace the code of the following scenarios, grow array from mirror > to level 5, it would be stuck at the beginning of reshape_progress when > using the loop devices, the same testing steps work well via to hard disk > devices. refer to the detail steps as follow. > Is this issue only happened on my site? > > *Steps for loop devices:* > 1). create one mirror array via to mdadm source code. > # cd mdadm/ > # ./test setup > # ./mdadm -CR /dev/md0 --level 1 -b internal -n2 /dev/loop[0-1] > # dmesg -c, clean the dmesg. > 2). triggers the reshape_request, then it would be stuck when start > reshape_progress. > ... ... > linux-x4lv:~/mdadm-test # ./mdadm --grow /dev/md0 -l5 -n3 -a /dev/loop2 > mdadm: level of /dev/md0 changed to raid5 > mdadm: added /dev/loop2 > mdadm: Need to backup 128K of critical section.. > > linux-x4lv:~/mdadm-test # cat /proc/mdstat > Personalities : [raid1] [raid6] [raid5] [raid4] > md0 : active raid5 loop2[2] loop1[1] loop0[0] > 19968 blocks super 1.2 level 5, 64k chunk, algorithm 2 [3/3] [UUU] > [>....................] reshape = 0.0% (1/19968) finish=41.5min > speed=0K/sec > bitmap: 0/1 pages [0KB], 65536KB chunk > > unused devices: <none> > > linux-x4lv:~/mdadm-test # dmesg -c > [111544.283359] md/raid:md0: device loop1 operational as raid disk 1 > [111544.283362] md/raid:md0: device loop0 operational as raid disk 0 > [111544.296161] md/raid:md0: raid level 5 active with 2 out of 2 devices, > algorithm 2 > [111544.296178] md/raid456: discard support disabled due to uncertainty. > [111544.296178] Set raid456.devices_handle_discard_safely=Y to override. > [111544.932238] md: reshape of RAID array md0 > > *Steps for hard disks:* > # ./mdadm --grow /dev/md0 -l5 -n3 -a /dev/sdd > mdadm: level of /dev/md0 changed to raid5 > mdadm: added /dev/sdd > mdadm: Need to backup 128K of critical section.. > > # cat /proc/mdstat > Personalities : [raid1] [raid0] [raid6] [raid5] [raid4] > md0 : active raid5 sdd[2] sdc[1] sdb[0] > 102272 blocks super 1.2 level 5, 64k chunk, algorithm 2 [3/3] [UUU] > [====>................] reshape = 22.5% (23168/102272) finish=0.5min > speed=2316K/sec > bitmap: 0/1 pages [0KB], 65536KB chunk > > unused devices: <none> can't reproduce locally. does this only exist in specific mdadm/kernel version? Thanks, Shaohua -- 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
