Ability to delete stale keys of encrypted objects from KMS
So far, when volume encryption was secured by using a Key Management Server, Volume Manager copied the encryption key (KEK) of the volume and used it for the corresponding snapshot volumes.
Also, when Volume Manager deleted an encrypted object, it did not delete the associated KEK. Over time, many such unused keys would get accumulated on the KMS, which would probably incur costs.
To address these inefficiencies, Volume Manager has been enhanced as follows:
- It uses separate KEKs for volumes and their snapshots.
- When a volume or any of its snapshots is deleted, it also deletes the associated KEK from the KMS.
- It provides a new tunable, delete_stale_kms_keys, which you can use to enable or disable the deletion of the associated KEK when an encrypted object is deleted. This feature is disabled by default.
Consideration for upgrade scenarios
You might have volumes and their snapshots created by earlier versions of Volume Manager in your environment, which share the same KEK. In such a scenario, if you enable the deletion of the associated KEK along with the encrypted object, the shared KEK will be deleted. Consequently, the other objects that shared the KEK will be rendered unusable, because Volume Manager will not be able to decrypt them.
For details, refer to the following documents as applicable to your environment:
- Storage Foundation 9.0 Administrator’s Guide - Linux
- Storage Foundation Cluster File System High Availability 9.0 Administrator’s Guide - Linux
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