Abstract: There is disclosed a method for managing data storage. In one embodiment, the method comprises operating a storage processor of a first data storage system at a first location. The storage processor comprising a first distributed data manager and an IO stack arranged therein such that distributed data manager can receive a LUN outputted by IO stack. The method also comprises initiating a communication between first distributed data manager and second distributed data manager associated with a second data storage system at a second location. The method further comprises migrating stored data on first data storage system to second data storage system and providing LUN information associated with stored data to second data storage system such that a LUN identify of migrated data stored on second data storage system is similar to a LUN identity of corresponding stored data on first data storage system.

Abstract: There is disclosed a method for use in managing data storage. In one embodiment, the method comprises operating storage processors of respective data storage systems at different location. The storage processors comprising a distributed data manager and an IO stack arranged within the storage processor such that the distributed data manager can receive a LUN outputted by the IO stack. The method further comprises distributed data managers receiving LUNs outputted by their corresponding IO stacks, controlling LUN output and providing LUN output that enables active-active access to the storage systems at the respective different locations.

Abstract: A technique for supporting failover between SPs at different physical sites includes operating a distributed data manager (DDM) in an IO stack of both a first SP at a first site and a second SP at a second site. The DDMs of the first and second SPs cooperatively function to provide LUN virtualization that preserves virtual LUN IDs such that the first SP and the second SP can each access the same virtualized LUNs using the same virtual LUN IDs. In the event of a failure at the first site, the second SP at the second site may access the virtualized LUNs originally accessed by the first SP, including those storing configuration and site-specific data for the first site, as if those LUNs were local to the second SP.