Messages in this thread | | | From | Neil Brown <> | Date | Mon, 9 Oct 2006 10:40:13 +1000 | Subject | Re: root MD array is still in use upon shutdown possible fix |
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On Friday October 6, czigola@elte.hu wrote: > Hi! > > When my root filesystem is on an MD (RAID5) array, I can't cleanly shut > down (trying to change the array ro, even when nothing else than the > kernel threads and init and one bash are running, and the root fs is ro > remounted), because I've got "md: md0 still in use" kernel messages. > Usually it doesn't cause any problems, but it possibly could leave the > array in an inconsistent state (resync required after reboot).
When your machine shuts down, all md arrays are automatically switched to read-only *after* the root filesystem has been unmounted. You should get a message md: stopping all md devices.
if you get e.g. md: md0 still in use. *after* that message then there might be a problem. Otherwise everything should be fine.
That being said, it is possible that your patch is OK. I've been meaning to review the rules for switching an array to read-only for ages, but it never got to the top of the todo list. e.g. do you want to be able to switch an array to read-only when a filesystem is mounted read-write off it. If you don't, how do you check? If you do, what about in-flight write requests? Do you need to wait for them to complete? How? It isn't as straight forward as one might like.
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