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[Cyril Roelandt <1990946@xxxxxxxxxxxxxxxxxx>]

Nothing in your bug report is related to Glance. If Glance were to use
another backend, you could still show the same commands and the same
outputs. Your issue is with Cinder itself.

I will mark this as Invalid, feel free to reopen if I'm wrong.

** Changed in: glance
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1990946

Title:
  Dell PowerFlex: Size shown for a volume doesn't match powerflex
  backend allocation

Status in Cinder:
  New
Status in Glance:
  Invalid

Bug description:
  Description

  When creating a volume, powerflex will round the value of the capacity
  by a multiple of 8GB leaving inconsistency between cinder which shows
  the value requested by the user and powerflex which shows the current
  allocation.

  Step to reproduce

  Create a volume with a size different from 8GB multiplier
  stack@SRA-Left-Openstack1:~/devstack$ openstack volume create --size 3 --type powerflex test_vol_pflex
  /usr/lib/python3/dist-packages/secretstorage/dhcrypto.py:15: CryptographyDeprecationWarning: int_from_bytes is deprecated, use int.from_bytes instead
    from cryptography.utils import int_from_bytes
  /usr/lib/python3/dist-packages/secretstorage/util.py:19: CryptographyDeprecationWarning: int_from_bytes is deprecated, use int.from_bytes instead
    from cryptography.utils import int_from_bytes
  +---------------------+--------------------------------------+
  | Field               | Value                                |
  +---------------------+--------------------------------------+
  | attachments         | []                                   |
  | availability_zone   | nova                                 |
  | bootable            | false                                |
  | consistencygroup_id | None                                 |
  | created_at          | 2022-09-27T09:05:36.735298           |
  | description         | None                                 |
  | encrypted           | False                                |
  | id                  | ebcc7949-2777-4841-9001-6da2b081b6d2 |
  | migration_status    | None                                 |
  | multiattach         | False                                |
  | name                | test_vol_pflex                       |
  | properties          |                                      |
  | replication_status  | None                                 |
  | size                | 3                                    |
  | snapshot_id         | None                                 |
  | source_volid        | None                                 |
  | status              | creating                             |
  | type                | powerflex                            |
  | updated_at          | None                                 |
  | user_id             | cf67ca76a2924d21988a3d21101324dd     |
  +---------------------+--------------------------------------+
  stack@SRA-Left-Openstack1:~/devstack$ openstack volume list
  /usr/lib/python3/dist-packages/secretstorage/dhcrypto.py:15: CryptographyDeprecationWarning: int_from_bytes is deprecated, use int.from_bytes instead
    from cryptography.utils import int_from_bytes
  /usr/lib/python3/dist-packages/secretstorage/util.py:19: CryptographyDeprecationWarning: int_from_bytes is deprecated, use int.from_bytes instead
    from cryptography.utils import int_from_bytes
  +--------------------------------------+----------------+-----------+------+-------------------------------------+
  | ID                                   | Name           | Status    | Size | Attached to                         |
  +--------------------------------------+----------------+-----------+------+-------------------------------------+
  | ebcc7949-2777-4841-9001-6da2b081b6d2 | test_vol_pflex | available |    3 |                                     |
  | 048a3748-8517-48df-9d37-e16ec2789408 | vol_pflex4     | in-use    |    8 | Attached to server1 on /dev/vdb     |
  | 470839d8-bfcf-45c5-ba9f-e6608c42bc49 | voltosnap      | available |    9 |                                     |
  | 620b2198-47bc-4d2a-9a60-2df4c35e91f4 |                | in-use    |    9 | Attached to serversnap on /dev/vda  |
  | 24e11e0b-44ad-4bee-9dc9-09e64f9413a1 | vol_pflex3     | available |    9 |                                     |
  | aadf3632-8419-47a2-bbe7-950b51f93fae | vol_pflex3     | error     |    8 |                                     |
  | 4c6092bd-75c0-4546-9360-e3e0ef224779 | vol_pflex2     | in-use    |    8 | Attached to server1 on /dev/vda     |
  | 80e0751c-4849-4981-a7cc-2b98d7d360ea | vol_pflex      | available |   10 |                                     |
  +--------------------------------------+----------------+-----------+------+-------------------------------------+

  
  This introduces multiple side effects:

  1. Allocation capacity not being monitored correctly
  2. Extension of volume withing the same range will fail as the volume is already at that size (Example: volume extenstion from 5 to 7, backend already set to 8)
  3. Quota also affected

  This bug consolidates other bugs opened for various behavior but still happens because of the same issue:
  https://bugs.launchpad.net/cinder/+bug/1915015
  https://bugs.launchpad.net/cinder/+bug/1935028
  https://bugs.launchpad.net/cinder/+bug/1952355

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