US Patent 10042579 Crash consistent snapshot

A method, system, and computer program product for splitting IOs directed to a first LUN and a second LUN to a journal on a replication site, creating a snapshot of the first LUN, creating a snapshot of the second LUN, and applying the IO in the journal on the replication site to a copy of the snapshot of the first LUN on the replication site and a copy of the snapshot of the second LUN on the replication site to create a consistent snapshot of the first LUN and the second LUN on the replication site.