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2.32. Volume Deletion and Garbage Collection

The deletion of a volume does not delete the snapshots that have been created from the volume
When a VM is destroyed, data disk volumes that are attached to the VM are not deleted.
Volumes are permanently destroyed using a garbage collection process. The global configuration variables expunge.delay and expunge.interval determine when the physical deletion of volumes will occur.
Administrators should adjust these values depending on site policies around data retention.