Patent ID: 8195600

Claim:
An apparatus operable with a host and a data storage component, comprising: a computational device, comprising: an allocating component responsive to a user input to allocate an expanded target storage space to a file system element to make an expanded file system element; a file system metadata component to maintain file system metadata including metadata for said expanded file system element; a file system input/output (I/O) component responsive to said file system metadata component to control file system I/O between said host and said data storage component; and a synchronizing component responsive to said file system metadata component to synchronize data between a source storage space and said expanded target storage space, wherein said file system I/O component is operable to use said file system metadata component to access said expanded file system element prior to completion of action of said synchronizing component, wherein said source storage space stores a file system that is to be migrated to said expanded target storage space having an additional space beyond that provided by said source storage space, wherein said source storage space is provided by a source storage device and said expanded target storage space is provided by a target storage device, said synchronizing data further comprising: sending, any selected write that is addressed to a block of said file system stored in said source storage device, to both said source storage device and said target storage device, wherein said selected write is not completed until writing of said selected write to both said source storage device and said target storage device is complete, wherein subsequent to completion of said selected write, a bitmap is updated by said file system metadata component to indicate that said block is in synchronization.