Defining system log data sets

To define system log data sets (SLDSs), consider choosing dual or single SLDS logging and defining a block size for the SLDS.

• Choosing dual or single SLDS logging

  You can choose either single or dual logging for the SLDS, just as you can for the OLDS and WADS. When archiving to tape, you can force the primary and secondary volumes to contain the same data by specifying the number of log blocks per volume using the force-end-of-volume (FEOV) keyword of the SLDS control statement. When IMS writes the specified number of blocks, IMS forces end of volume on both the primary and secondary data sets.

  To use dual logging, supply both a primary and secondary DD statement for each SLDS.

• Defining a block size for the SLDS

  The block size of the SLDS can differ from the block size of the OLDSs being archived. However, the block size of primary and secondary SLDS must be the same when using the FEOV keyword.