Re: unable to unmap rbd

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On Thu, Mar 14, 2013 at 4:09 AM, Léon Keijser <keijser@xxxxxxxxxxxx> wrote:
> Hi,
>
> Every now and then I'm unable to unmap an RBD device:
>
> root@c2-backup ~ # rbd showmapped
> id      pool    image   snap    device
> 0       20-kowin-a      20-kowin-a-01   -       /dev/rbd0
> root@c2-backup ~ # rbd unmap /dev/rbd0
> /dev/rbd0 is not an rbd device
> remove failed: (22) Invalid argument
>
> The only solution I've found so far is rebooting the machine. This is of
> course not a very nice option, so if someone knows why this occurs and
> how to prevent/fix it without rebooting, I'd be grateful :)

Should be fixed in a recent kernel.  See:
http://tracker.ceph.com/issues/2654.  Alex do you know what kernel
version has this fix?
-sam

>
> Thanks!
>
> Léon
>
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