= Verification =
I see 2 pieces to this:
1) The original report, in Comment #1, where the offending patch caused an
issue on a system where it shouldn't have - i.e., a raid0 w/ homogenous member
sizes. We were never able to reproduce this in subsequent tests w/ the patch
applied. I know sfeole was able to perform the same MAAS install/upgrade w/ the
current -proposed kernel (I saw a test report from it), so I think we can
confidently say it is not reproducible in that build either.
2) In configs where this patch *should* prevent a raid0 from assembling
(heterogenous sizes), I've verified that if I create such an array on an older
kernel, then upgrade to the current -proposed kernel, it starts automatically.
Now, of course, I continue to be susceptible to corruption, but that's known
and tracked in bug 1850540.
$ cat /proc/version
Linux version 4.15.0-66-generic (buildd@lgw01-amd64-044) (gcc version 7.4.0
(Ubuntu 7.4.0-1ubuntu1~18.04.1)) #75-Ubuntu SMP Tue Oct 1 05:24:09 UTC 2019
$ sudo mdadm --create /dev/md0 --run --metadata=default --homehost=akis
--level=0 --raid-devices=2 /dev/vdb1 /dev/vdc1
mdadm: /dev/vdb1 appears to be part of a raid array:
level=raid0 devices=2 ctime=Thu Oct 31 21:53:40 2019
mdadm: /dev/vdc1 appears to be part of a raid array:
level=raid0 devices=2 ctime=Thu Oct 31 21:53:40 2019
mdadm: array /dev/md0 started.
$ sudo reboot
$ cat /proc/version
Linux version 4.15.0-68-generic (buildd@lgw01-amd64-037) (gcc version 7.4.0
(Ubuntu 7.4.0-1ubuntu1~18.04.1)) #77-Ubuntu SMP Sun Oct 27 06:02:23 UTC 2019
$ cat /proc/mdstat
Personalities : [raid0] [linear] [multipath] [raid1] [raid6] [raid5] [raid4]
[raid10]
md127 : active raid0 vdc1[1] vdb1[0]
1567744 blocks super 1.2 512k chunks
unused devices: <none>
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https://bugs.launchpad.net/bugs/1849682
Title:
[REGRESSION] md/raid0: cannot assemble multi-zone RAID0 with
default_layout setting
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