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: <none>
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" <chris@xxxxxxxxxxxxxxxxx>
> To: linux-raid@xxxxxxxxxxxxxxx
> 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
> --
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