On Mon, Sep 10, 2018 at 10:46 AM Martin Palma <martin@xxxxxxxx> wrote:
>
> We are trying to unmap an rbd image form a host for deletion and
> hitting the following error:
>
> rbd: sysfs write failed
> rbd: unmap failed: (16) Device or resource busy
>
> We used commands like "lsof" and "fuser" but nothing is reported to
> use the device. Also checked for watcher with "rados -p pool
> listwatchers image.rbd" but there aren't any listed.
The device is still open by someone. Check for LVM volumes, multipath,
loop devices etc. None of those typically show up in lsof.
>
> By investigating `/sys/kernel/debug/ceph/<cluster-id>/osdc` we get:
>
> 160460241 osd150 19.b2af34 image.rbd
> 231954'1271503593144320 watch
Which kernel is that?
>
> Our goal is to unmap the image for deletion so if the unmap process
> should destroy the image is for us OK.
>
> Any help/suggestions?
On newer kernels you could do "rbd umap -o force <device>", but it
looks like you are running an older kernel.
Thanks,
Ilya
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