On Sat, 1 Feb 2014 09:35:20 -0500 Nate Dailey <nate.dailey@xxxxxxxxxxx> wrote:
> If an LVM raid1 recovery is interrupted by deactivating the LV, when the
> LV is reactivated it comes up with both members in sync--the recovery
> never completes.
>
> I've been trying to figure out how to fix this. Does this approach look
> okay? I'm not sure what else to use to determine that a member disk is
> out of sync. It looks like if disk_recovery_offset in the superblock
> were updated during the recovery, that would also cause it to resume
> after interruption--but MD skips the recovery target disk when writing
> superblocks, so this doesn't work.
>
> Comments?
I know it is confusing, but this should really have gone to dm-devel rather
than linux-raid, to make sure Jon Brassow see it (hi Jon!).
Setting recovery_offset to 0 certainly looks wrong, it should be set to
sb->disk_recovery_offset
like the code just above your change.
Why does the code there not meet your need.
Jon: can you help?
NeilBrown
>
> Thanks,
>
> Nate Dailey
> Stratus Technologies
>
>
>
> diff -Nupr linux-3.12.9.orig/drivers/md/dm-raid.c
> linux-3.12.9/drivers/md/dm-raid.c
> --- linux-3.12.9.orig/drivers/md/dm-raid.c 2014-02-01
> 08:46:51.088086299 -0500
> +++ linux-3.12.9/drivers/md/dm-raid.c 2014-02-01 09:02:06.657149550 -0500
> @@ -1042,6 +1042,21 @@ static int super_validate(struct mddev *
> rdev->recovery_offset = le64_to_cpu(sb->disk_recovery_offset);
> if (rdev->recovery_offset != MaxSector)
> clear_bit(In_sync, &rdev->flags);
> + else if (!test_bit(Faulty, &rdev->flags)) {
> + uint64_t events_sb;
> +
> + /*
> + * Trigger recovery if events is out-of-date.
> + */
> + events_sb = le64_to_cpu(sb->events);
> + if (events_sb < mddev->events) {
> + DMINFO("Force recovery on out-of-date device #%d.",
> + rdev->raid_disk);
> + clear_bit(In_sync, &rdev->flags);
> + rdev->saved_raid_disk = rdev->raid_disk;
> + rdev->recovery_offset = 0;
> + }
> + }
> }
>
> /*
>
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