** Changed in: nova
Status: Expired => Confirmed
** Changed in: nova
Assignee: (unassigned) => Lee Yarwood (lyarwood)
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https://bugs.launchpad.net/bugs/1336683
Title:
Multipath device descriptor and iscsi device not deleted when
detaching multiple volumes at the same time at the same host
Status in OpenStack Compute (nova):
Confirmed
Bug description:
For every detached volume the nova-compute instance deletes all multipath
devices from the host while detaching. This is working fine if the volumes are
detached each by each, but not for multiple detachment.
Nova-compute always rescans the iscsi devices before it detaches them. The
rescan reconnects all missing devices if the Volume is still available on the
VNX. In the time between the iscsi devices are deleted and cinder-volume is
actually detaching the volume on the vnx site, the iscsi connections will be
always reconnected by any rescan. All detachments run into one thread on the
host, so the detachment is done one by one. However the detachment on the
cinder-volume site is done through multithreading and the nova-compute is not
waiting between the detachments for cinder-volume to detach. So it can happen
that the device is deleted and the next detachment of the next volume brings
back the devices.
The next time a volume is attached to this VM on this host an error will
occur. Or if this is working the the volume will stay in use until the VM is
terminated. It is not possible to detach the volume again.
Also the information of the volume is not updated for the second detachment.
The size stays the same also the new attachment is totally different.
3600601604781340063b2b4293601e411 dm-2 DGC ,VRAID
size=4.0G features='0' hwhandler='0' wp=rw
|-+- policy='round-robin 0' prio=2 status=enabled
| |- 7:0:0:3 sdr 65:16 failed ready running
| `- 6:0:0:3 sdq 65:0 failed ready running
`-+- policy='round-robin 0' prio=1 status=enabled
`- 9:0:0:3 sds 65:32 failed ready running
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