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[Jean Pierre Roquesalane <1990946@xxxxxxxxxxxxxxxxxx>]

In order to consolidate, I think we might consider having one bug opened
for all consequences of this misbehavior

** Tags added: emc glance powerflex size volume

** Tags removed: glance

** Also affects: glance
   Importance: Undecided
       Status: New

** Summary changed:

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

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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:
  New

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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