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SubjectRe: [bug?] raid1 integrity checking is broken on 2.6.18-rc4


On Sat, 12 Aug 2006, Chuck Ebbert wrote:

> Doing this on a raid1 array:
> echo "check" >/sys/block/md0/md/sync_action
>
> On 2.6.16.27:
> Activity lights on both mirrors show activity for a while,
> then the array status prints on the console.
>
> On 2.6.18-rc4 + the below patch:
> Drive activity light blinks once on one drive, then the
> array status prints (obviously no checking takes place.)
>
>
> Applied hotfix on 2.6.18-rc4:
>
> --- .prev/drivers/md/md.c 2006-08-08 09:00:44.000000000 +1000
> +++ ./drivers/md/md.c 2006-08-08 09:04:04.000000000 +1000
> @@ -1597,6 +1597,19 @@ void md_update_sb(mddev_t * mddev)
>
> repeat:
> spin_lock_irq(&mddev->write_lock);
> +
> + if (mddev->degraded && mddev->sb_dirty == 3)
> + /* If the array is degraded, then skipping spares is both
> + * dangerous and fairly pointless.
> + * Dangerous because a device that was removed from the array
> + * might have a event_count that still looks up-to-date,
> + * so it can be re-added without a resync.
> + * Pointless because if there are any spares to skip,
> + * then a recovery will happen and soon that array won't
> + * be degraded any more and the spare can go back to sleep then.
> + */
> + mddev->sb_dirty = 1;
> +
> sync_req = mddev->in_sync;
> mddev->utime = get_seconds();
> if (mddev->sb_dirty == 3)
> --
> Chuck
>
> -
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>

Is there a doc for all of the options you can echo into the sync_action?
I'm assuming mdadm does these as well and echo is just another way to run
work with the array?
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