Emc IP Holding Company LLC

Jayapaul Paul

Deepak Vokaliga

Hana Moreshet

Ning Wu

Sathyanarayan Jaganathan

Avraham Nash

Providing snapshots for a logical device includes maintaining a global sequence number for the logical device, providing a snapshot table having a plurality of entries, where each of the entries corresponds to a targetless snapshot and includes a sequence number associated with a particular one of the targetless snapshots, the sequence number corresponding to the global sequence number at a time each of the snapshots is created, and, if a sequence number associated with a specific portion of the logical device is less than the global sequence number, then prior to moving new data to a specific portion of the logical device, copying old data from the specific portion to a location in a pool device, setting a pointer in a replication data pointer table to point to the location in the pool device and setting the sequence number associated with the specific portion to equal the global sequence number.

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Jayapaul Paul