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You can reset the state of the volume and then delete it (admin only):

cinder reset-state <vol_id>  #sets to available

________________________________
From: Will Zhou <zzxwill at gmail.com>
Sent: Wednesday, June 22, 2016 1:22:31 AM
To: OpenStack Development Mailing List (not for usage questions)
Subject: [openstack-dev] [nova][cinder] How to delete a volume which is attached to a server who was deleted

Hi all,

I'd like to delete a volume which is attached to a server who was deleted. It failed. How can I delete the volume? Thanks.

[root at b-node3 ~]# openstack volume delete aff1c13f-3c08-4230-9c1f-7d48e342054a
Invalid volume: Volume status must be available or error or error_restoring or error_extending and must not be migrating, attached, belong to a consistency group or have snapshots. (HTTP 400) (Request-ID: req-50033eb3-c8f2-41bb-8841-d8436cdb464d)

[root at b-node3 ~]# openstack volume list
+--------------------------------------+--------------+-----------+------+---------------------------------------------------------------+
| ID                                   | Display Name | Status    | Size | Attached to                                                   |
+--------------------------------------+--------------+-----------+------+---------------------------------------------------------------+
| aff1c13f-3c08-4230-9c1f-7d48e342054a | 1            | in-use    |    1 | Attached to e0929b6b-8880-45be-a400-23c06e399e64 on /dev/vdb  |
+--------------------------------------+--------------+-----------+------+---------------------------------------------------------------+

[root at b-node3 ~]# openstack server show e0929b6b-8880-45be-a400-23c06e399e64
+--------------------------------------+--------------------------------------------------------------+
| Field                                | Value                                                        |
+--------------------------------------+--------------------------------------------------------------+
| OS-DCF:diskConfig                    | MANUAL                                                       |
| OS-EXT-AZ:availability_zone          | nova                                                         |
| OS-EXT-SRV-ATTR:host                 | b-node3                                                      |
| OS-EXT-SRV-ATTR:hypervisor_hostname  | b-node3                                                      |
| OS-EXT-SRV-ATTR:instance_name        | instance-00000083                                            |
| OS-EXT-STS:power_state               | 4                                                            |
| OS-EXT-STS:task_state                | None                                                         |
| OS-EXT-STS:vm_state                  | soft-delete                                                  |
| OS-SRV-USG:launched_at               | 2016-06-16T06:23:42.000000                                   |
| OS-SRV-USG:terminated_at             | None                                                         |
| accessIPv4                           |                                                              |
| accessIPv6                           |                                                              |
| addresses                            | public01=192.168.201.44                                      |
| config_drive                         |                                                              |
| created                              | 2016-06-16T06:22:41Z                                         |
| flavor                               | 1CPU_2GB (2)                                                 |
| hostId                               | 4e4564c50cedaa6451f4ffd5d0b835c12a92ef5f188d7a1a58e4e27f     |
| id                                   | e0929b6b-8880-45be-a400-23c06e399e64                         |
| image                                | CentOS-6.6-with-agent (3ab17999-374d-4638-a5ad-2dd3015cb8bc) |
| key_name                             | None                                                         |
| name                                 | f                                                            |
| os-extended-volumes:volumes_attached | [{u'id': u'aff1c13f-3c08-4230-9c1f-7d48e342054a'}]           |
| project_id                           | c172d37d71114546b4ea3d96c0b27876                             |
| properties                           |                                                              |
| security_groups                      | [{u'name': u'default'}]                                      |
| status                               | SOFT_DELETED                                                 |
| updated                              | 2016-06-22T06:23:43Z                                         |
| user_id                              | bf8316d6867d4ea6a043661375f4a7c6                             |
+--------------------------------------+--------------------------------------------------------------+