We are using following tools in our cloud.
Openstack - Essex
Ceph - Cluster with Bobtail and few clients with Firefly and Dumpling
We are trying to delete rbd image 'nova8' but it says image/device is busy.
The compute node on which this rbd image was mounted on, crashed few weeks ago. We have had issues removing this image.
rbd rm nova8 -p rbdinstances
Removing image: 99% complete...failed.
rbd: error: image still has watchers
This means the image is still open or the client using it crashed. Try again after closing/unmapping it or waiting 30s for the crashed client to timeout.
2016-02-10 06:56:55.000667 7f9412cfc780 -1 librbd: error removing header: (16) Device or resource busy
Per documentation, we tried to use 'rados listwatchers' API. But we are getting unusual errors. I have a feeling that we maybe we are missing something in our configuration file which is taken from the verison of Ceph Bobtail
rados -p rbdinstances listwatchers nova8.rbd
error listing watchers rbdinstances/nova8.rbd: Operation not supported
rbd info nova8 -p rbdinstances
rbd image 'nova8':
size 500 GB in 128000 objects
order 22 (4096 KB objects)
block_name_prefix: rb.0.1d2060.238e1f29
format: 1
rados -p rbdinstances listwatchers rb.0.1d205d.238e1f29
error listing watchers rbdinstances/rb.0.1d205d.238e1f29: No such file or directory
rados -v
ceph version 0.67.11 (bc8b67bef6309a32361be76cd11fb56b057ea9d2)
We would like to ultimately delete the image or at least find our which client is holding on to this image 'nova8'.
Any help would be appreciated. Thanks!
Tahir
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