Re: cannot open /dev/xvdb: Input/output error

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On Sun, Jun 25, 2017 at 06:58:37PM +0200, Massimiliano Cuttini wrote:
> I can see the error even if I easily run list-mapped:
> 
>    # rbd-nbd list-mapped
>    /dev/nbd0
>    2017-06-25 18:49:11.761962 7fcdd9796e00 -1 asok(0x7fcde3f72810) AdminSocketConfigObs::init: failed: AdminSocket::bind_and_listen: failed to bind the UNIX domain socket to '/var/run/ceph/ceph-client.admin.asok': (17) File exists/dev/nbd1

"AdminSocket::bind_and_listen: failed to bind" errors are harmless,
you can safely ignore them (or configure admin_socket in ceph.conf to
avoid names collisions).

Don't you see other errors?

What is output for `ps auxww |grep rbd-nbd`?

As the first step you could try to export images to file using `rbd
export`, see if it succeeds and probably investigate the content.

-- 
Mykola Golub
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