MANAGEMENT OF WRITABLE SNAPSHOTS IN A NETWORK STORAGE DEVICE

摘要

Methods, systems, and computer programs are presented for creating writable snapshots of logical data units in a network storage array. One method includes operations for receiving a request to create a snapshot at a storage device, the snapshot being a point-in-time copy of a volume in the storage device, and for creating the snapshot with a first snap-point corresponding to a state of the volume when the snapshot is created. The snapshot is writeable when the snapshot is created. Further, the method includes operations for receiving one or more requests to make changes to the snapshot, for creating one or more snap-points for the snapshot after processing the one or more requests, and for closing the snapshot. The snapshot is not writeable after the snapshot is closed and access to the snapshot, after closing the snapshot, accesses data associated with a last snap-point of the snapshot.

主权项

1. A method comprising:
receiving a request to create a snapshot at a storage device, the snapshot being a point-in-time copy of a volume in the storage device; creating the snapshot with a first snap-point corresponding a state of the volume when the snapshot is created, wherein the snapshot is writeable when the snapshot is created; receiving one or more requests to make changes to the snapshot; creating one or more snap-points for the snapshot after processing the one or more requests; and closing the snapshot, wherein the snapshot is not writeable after the snapshot is closed, wherein access to the snapshot after closing the snapshot accesses data associated with a last snap-point of the snapshot.