MAINTAINING RELATIVE REFERENCES WHEN UNLINKING VOLUMES FROM A VOLUME CHAIN

摘要

A request to delete a snapshot of a virtual machine may be received. The snapshot may be in a volume chain that may include a first storage volume, a second storage volume associated with the snapshot, and a third storage volume. The first storage volume may include a first storage reference. The second storage volume may include a second storage reference. The third storage volume may include a third storage reference relative to the second storage reference. The second storage volume may be merged with the first storage volume preceding the second storage volume in the volume chain. The third storage reference may be updated to be relative to the first storage reference in view of the second storage reference. The snapshot and the second storage volume may be deleted.

主权项

1. A method comprising:
receiving a request to delete a snapshot of a virtual machine; identifying a volume chain in a shared storage that comprises the snapshot, the volume chain comprising a first storage volume, a second storage volume associated with the snapshot, and a third storage volume, the first storage volume comprising a first storage reference, the second storage volume comprising a second storage reference, the third storage volume comprising a third storage reference relative to the second storage reference; merging the second storage volume associated with the snapshot with the first storage volume preceding the second storage volume in the volume chain; updating, by a processor, the third storage reference to be relative to the first storage reference in view of the second storage reference; and deleting the second storage volume associated with the snapshot.