The DECRAM RECOVER command restores all the disks in MDRECOVER.DAT
    with the PERSIST attribute. In other words, the MDRECOVER.DAT file
    is read and a memory disk is created (including memory allocation)
    for each entry in the file with the PERSIST attribute. It is the
    same command that is run during startup under SYSMAN. You cannot
    delete memory disks once created without a reboot. A memory disk
    entry in MDRECOVER.DAT cannot be deleted but its size or capacity
    can be set to zero so that it does not use any system resources.
    The VMScluster operates with maximum recovery capability if
    MDRECOVER.DAT is on a VMScluster shared physical disk (see User's
    manual for details).