After migrate volume to 3PAR between different backends, fails to find and delete original volume

[Daniil Kharun]

After you migrate a volume to a 3PAR between different backends, the original volume can then not be found and deleted by the driver. Because update_migrated_volume() is only executed for the new backend and cannot rename the original disk on the original backend.

1. Create volume on 3par (SSD):
openstack volume create --size 8 --type SSD TEST
+---------------------+--------------------------------------+
| Field | Value |
+---------------------+--------------------------------------+
| attachments | [] |
| bootable | false |
| consistencygroup_id | None |
| created_at | 2020-07-28T14:47:18.000000 |
| description | None |
| encrypted | False |
| id | 65391c97-bc1e-4ab7-a027-6c2eb4a900d1 |
| migration_status | None |
| multiattach | False |
| name | TEST |
| properties | |
| replication_status | None |
| size | 8 |
| snapshot_id | None |
| source_volid | None |
| status | creating |
| type | SSD |
| updated_at | None |
| user_id | cf90b6beffd344c1b9f419cddae09394 |
+---------------------+--------------------------------------+

2. Retype volume
cinder retype --migration-policy on-demand TEST HDD

3. Show log

2020-07-28 17:53:26.466 46790 INFO cinder.volume.drivers.hpe.hpe_3par_common [req-8dd800e6-c91b-4cb6-88f1-5563bca3a6b3 cf90b6beffd344c1b9f419cddae09394 4cf8b74781414a2585fe49ac35d76adb - default default] Current volume changed from osv-3bdEsQZ0TASv6Oz4N8e4.A to osv-ZTkcl7weSregJ2wutKkA0Q
2020-07-28 17:53:26.753 46791 INFO cinder.volume.manager [req-8dd800e6-c91b-4cb6-88f1-5563bca3a6b3 cf90b6beffd344c1b9f419cddae09394 4cf8b74781414a2585fe49ac35d76adb - default default] Complete-Migrate volume completed successfully.
2020-07-28 17:53:26.754 46791 INFO cinder.volume.manager [req-8dd800e6-c91b-4cb6-88f1-5563bca3a6b3 cf90b6beffd344c1b9f419cddae09394 4cf8b74781414a2585fe49ac35d76adb - default default] Migrate volume completed successfully.
2020-07-28 17:53:26.970 46791 WARNING cinder.volume.drivers.hpe.hpe_3par_common [req-8dd800e6-c91b-4cb6-88f1-5563bca3a6b3 cf90b6beffd344c1b9f419cddae09394 4cf8b74781414a2585fe49ac35d76adb - default default] Delete volume id not found. Removing from cinder: ddb744b1-0674-4c04-afe8-ecf837c7b8f8 Ex: Not found (HTTP 404) 23 - volume does not exist: HTTPNotFound: Not found (HTTP 404) 23 - volume does not exist

4. Show VV on new 3par (HDD) backend:
cli%showvv osv-ZTkcl7weSregJ2wutKkA0Q
                                                                                      -Rsvd(MiB)- -(MiB)-
  Id Name Prov Compr Dedup Type CopyOf BsId Rd -Detailed_State- Snp Usr VSize
1623 osv-ZTkcl7weSregJ2wutKkA0Q tpvv No No base --- 1623 RW normal 1024 1024 8192
---------------------------------------------------------------------------------------------------------
   1 total 1024 1024 8192

5. Show VV on old 3par (SSD) backend:

cli% showvv osv-ZTkcl7weSregJ2wutKkA0Q
                                                                                     -Rsvd(MiB)- -(MiB)-
 Id Name Prov Compr Dedup Type CopyOf BsId Rd -Detailed_State- Snp Usr VSize
377 osv-ZTkcl7weSregJ2wutKkA0Q tdvv No Yes base --- 377 RW normal 1024 1024 8192
--------------------------------------------------------------------------------------------------------
  1 total 1024 1024 8192

[Eric Harney (eharney)]

This looks the same as this bug, which was recently fixed:

https://bugs.launchpad.net/cinder/+bug/1697422

Can you confirm which version of the code you are using?

[Daniil Kharun (harunaga)]

You're right, it's the same bug.

[Raghavendra Tilay (raghavendrat)]

Hi Daniil,

Gorka Eguileor fixed this bug in master (at time it was Victoria).
https://review.opendev.org/#/c/730830/

Later, the fix was backported to Ussuri & Train as well.

Please check & let me know if this bug can be closed.

Regards,
Raghavendra Tilay.