Using XFS (latest 2.4.9-xfs) over raid5 I got a message:
raid5: multiple 1 requests for sector 24663824
and the explanation I got from the raid list is:
> It means that while raid5 had an outstanding write request on a
> particular sector, it received another write request for the same
> sector.
>
> It trys to do the right thing and write them both out in the order
> that it received them, but it is a bit of a worry that any filesystem
> would do this. I'm guessing that Andrew is using XFS too. Is that
> right?
>
> While raid5 tries to keep the requests in order, and I suspect other
> drivers do to, I don't think that it is reasonable to assume that no
> device driver will ever re-order two requests for the same sector.
> If I were the author of the filesystem I would be worried.
>
> NeilBrown
This truely sounds worrying. Is this OK to be this way or is this
an issue that needs fixing?
--
Eyal Lebedinsky (eyal@xxxxxxxxxxxxxx) <http://samba.anu.edu.au/eyal/>
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