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Setting the DRL map length

 To set a DRL map length

  1. Stop the volume to make the DRL inactive.
  2. Type the following command:

    # vxvol -g dgTestSol2 set [loglen=len-blocks] \

      [logmap_len=len-bytes] volume

    This command does not change the existing DRL map size.

    Note the following restrictions

    If both logmap_len and loglen are specified 

    • if logmap_len is greater than loglen/2, vxvol fails with an error message. Either increase loglen to a sufficiently large value, or decrease logmap_len to a sufficiently small value.
    • The value of logmap_len cannot exceed the number of bytes in the on-disk map.

    If logmap_len is specified 

    • The value is constrained by size of the log, and cannot exceed the size of the on-disk map.

      Thesize of the on-disk map in blocks can be calculated from the following formula:

      round(loglen/nmaps) - 24

      where nmaps is 2 for a private disk group, or 33 for a shared disk group.

    • The value of logmap_len cannot exceed the number of bytes in the on-disk map.

    If loglen is specified 

    • Specifying a value that is less than twice the disk group alignment value results in an error message.
    • The value is constrained by size of the logging subdisk.