Red Hat Bugzilla – Bug 977814
[RFE] don't continue with create of volumes on nfs storage if mount fails
Last modified: 2016-04-26 12:12:27 EDT
Created attachment 765066 [details]
Description of problem:
If I run a script that creates 100 volumes on nfs based cinder storage and mount fails, we create the volumes but set them in error status.
thinking of user experience, even with the whole openstack view of no rollback, I think that if mount fails we should not continue with the create of the volume since technically we have not started to create the volumes yet.
Version-Release number of selected component (if applicable):
[root@opens-vdsb ~]# rpm -qa |grep cinder
Steps to Reproduce:
1. add nfs storage to cinder
2. make sure that rpcbind is stopped
3. create a volume
4. list volume
volume is created with status error because mount fails.
user now must delete the volume created since there is no roll forward or rollback.
I don't think that we should continue with create of volumes if mount fails.
Additional info: logs
IIUC, the suggestion here is that if we cannot successfully create the volume, there should not be a cinder volume record created at all.
But, many decisions and operations that determine whether the volume can be created successfully or not (especially those at the volume driver level like mounting the NFS share) happen after the volume record has been created and returned to the client in the "creating" state. This would be a fundamental change to the current model, which does not treat volume creation as a synchronous all-or-nothing operation.
This is reproduced 100%.
please close as wontfix and not as worksfor me if you do not wish to fix this behaviour.
This has been improved in Havana in that volume drivers that fail to initialize will no longer attempt to handle requests.
It will not be fixed in the way described here, as the Cinder model is still
1) Create volume record
2) Hand that to scheduler
3) Volume service gets this, now fails (can't mount storage)
4) Volume status is set to "error"
5) User deletes the volume record
It is not practical to have the API service decide to not create the volume record based on cinder-volume service results.