Why are you making the same rbd to multiple servers?
On Wed, Feb 27, 2019, 9:50 AM Ilya Dryomov <idryomov@xxxxxxxxx> wrote:
On Wed, Feb 27, 2019 at 12:00 PM Thomas <74cmonty@xxxxxxxxx> wrote:
>
> Hi,
> I have noticed an error when writing to a mapped RBD.
> Therefore I unmounted the block device.
> Then I tried to unmap it w/o success:
> ld2110:~ # rbd unmap /dev/rbd0
> rbd: sysfs write failed
> rbd: unmap failed: (16) Device or resource busy
>
> The same block device is mapped on another client and there are no issues:
> root@ld4257:~# rbd info hdb-backup/ld2110
> rbd image 'ld2110':
> size 7.81TiB in 2048000 objects
> order 22 (4MiB objects)
> block_name_prefix: rbd_data.3cda0d6b8b4567
> format: 2
> features: layering
> flags:
> create_timestamp: Fri Feb 15 10:53:50 2019
> root@ld4257:~# rados -p hdb-backup listwatchers rbd_data.3cda0d6b8b4567
> error listing watchers hdb-backup/rbd_data.3cda0d6b8b4567: (2) No such
> file or directory
> root@ld4257:~# rados -p hdb-backup listwatchers rbd_header.3cda0d6b8b4567
> watcher=10.76.177.185:0/1144812735 client.21865052 cookie=1
> watcher=10.97.206.97:0/4023931980 client.18484780
> cookie=18446462598732841027
>
>
> Question:
> How can I force to unmap the RBD on client ld2110 (= 10.76.177.185)?
Hi Thomas,
It appears that /dev/rbd0 is still open on that node.
Was the unmount successful? Which filesystem (ext4, xfs, etc)?
What is the output of "ps aux | grep rbd" on that node?
Try lsof, fuser, check for LVM volumes and multipath -- these have been
reported to cause this issue previously:
http://tracker.ceph.com/issues/12763
Thanks,
Ilya
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