When using tape output media for Archive processing, activate Archive Output Tape chaining to reduce the number of EXCPs and to improve performance. The best practice is to set sysparm IOCHNBLK to 9.
Business Value:
Specifying the sysparm IOCHNBLK turns on Archive Output Tape chaining. The default value of 1 indicates no chaining will be done. Setting the value higher than 1 reduces the number of EXCPs needed to write the larger data sets to tape and reduces the elapsed processing time due to tape channel conflicts.
Additional Considerations:
The Sysparm IOCHNBLK can be set from 1 to 9. The value specifies the number of tape blocks to be written to the tape concurrently. A higher value of the sysparm IOCHNBLK
reduces the number of EXCPs issued to the tape, and reduces the elapsed time due to tape channel conflicts. The IOCHNBLK parameter increases the storage utilization by (
n
-1)*tape blocksize*2. If you are using disk output media instead of the tape output media for both primary and secondary output, the sysparm IOCHNBLK should be set to 1.More Information:
For more information about the system parameter definitions, see the Systems Guide.
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