On Mon, 2022-03-21 at 15:31 -0400, Alan Davis wrote:

All,

I'm having a problem with launching a volume that already exists. I'm not finding any indication why DiskFilter is saying there's not enough disk space available.

what release of nova are you using. the disk filter has been deprecated for a number of years and removed in recent releases in favor of counting disk in placement.

This is not a new system, it's been in use for over a year and has more than 20 VM's running on it already. Creating a volume (either from image or from install iso) is my normal way of creating instances, so this isn't anything I haven't done many times.

instnaces that are booted form a volume shoudl have a flavor that requests 0 root gb if you use a flavor that request root gb the disk filter will still

Any ideas on why or what debugging steps I can take would be appreciated.

Here's the error from nova-scheduler.log

2022-03-21 15:20:22.021 16602 INFO nova.filters [req-f8909a62-723d-4128-9e68-2fe445fa861d a676762eea994d08a7ce018c3ccbb0b8 1ab386267c2b4c969d551ea763c906dc - default default] Filtering removed all hosts for the request with instance ID '59dfe21d-c527-4fd7-ad50-39c144af93fc'. Filter results: ['RetryFilter: (start: 1, end: 1)', 'AvailabilityZoneFilter: (start: 1, end: 1)', 'RamFilter: (start: 1, end: 1)', 'DiskFilter: (start: 1, end: 0)']

the retry filter ram filter and disk filter are not required in any release that has placment so if you are using ~pike or later you do not need them enabled. placment will have already valdiated ram and disk capasity and the retry filter is repleace with a set of alternate hosts that are selected when the vm is initally schduled.

vgs (yes, i know... LVM) shows plenty of space, as well

VG #PV #LV #SN Attr VSize VFree centos_stack2 1 3 0 wz--n- 74.00g 0 cinder-volumes 1 51 1 wz--n- <9.10t <3.64t

openstack says: +--------------------------------+---------------------------------------+

...

Field | Value |

+--------------------------------+---------------------------------------+

...

attachments | [] | availability_zone | nova | bootable | true | consistencygroup_id | None | created_at | 2022-03-21T15:44:44.000000 | description | root disk for rh8.3 vm | encrypted | False | id | 3a2aab97-d49d-431c-824d-5fbdcac40fa3 | migration_status | None | multiattach | False | name | rhel83-str-root | os-vol-host-attr:host | stack2.xxxx@lvm#lvm | os-vol-mig-status-attr:migstat | None | os-vol-mig-status-attr:name_id | None | os-vol-tenant-attr:tenant_id | 1ab386267c2b4c969d551ea763c906dc | properties | | replication_status | None | size | 80 | snapshot_id | None | source_volid | None | status | reserved | type | iscsi | updated_at | 2022-03-21T19:20:20.000000 | user_id | a676762eea994d08a7ce018c3ccbb0b8 |

+--------------------------------+---------------------------------------+