Checksum_Verification
    Nochecksum_Verification

    Requests that the page checksum be verified for each page moved.
    The default is to perform this verification.

    The Checksum_Verification qualifier uses CPU resources but can
    provide an extra measure of confidence in the quality of the data
    being moved.

    Use of the Checksum_Verification qualifier offers an additional
    level of data security when the database employs disk striping
    or RAID (redundant arrays of inexpensive disks) technology. These
    technologies fragment data over several disk drives, and use
    of the Checksum_Verification qualifier permits Oracle RMU to
    detect the possibility that the data it is reading from these
    disks has been only partially updated. If you use either of these
    technologies, you should use the Checksum_Verification qualifier.

    Oracle Corporation recommends that you use the Checksum_
    Verification qualifier with all move operations where integrity
    of the data is essential.