The TMSXTEND utility is the preferred method of adding TMC volume ranges and DSNB records, unless selected nonstandard, alphanumeric volume serial numbers are in use in your installation.
Note: For more information about the TMSXTEND utility and the restrictions on nonstandard VOLSERs, see the Utilities and Reports Reference Guide.
The process of adding new records is called extending the TMC. The TMSXTEND utility extends the TMC with minimal disruption to tape processing. If you cannot run TMSXTEND because your installation uses non-standard tape volume serial numbers, the process requires additional planning. Before the extend operation, use the TMSFORMT utility and stop all tape processing and all CA 1 batch and online activity. Place CA 1 into a batch active mode.
The THDSNB parameter in the TMOOPTxx member of hlq.CTAPOPTN establishes the warning threshold limit on the number of DSNB records that are used before the first IEFTMS9 USED DSNBS HAVE PASSED THE THRESHOLD, CURRENT UTILIZATION IS nn% warning message is issued. The limit is a percentage of the total number of formatted DSNB records. The system default is 90 percent. Regularly review the statistics that are printed by the TMSCOPY program in TMS Report 31 to ensure that your DSNB allocation is not nearing capacity.
The warning message (IEFTMS9) is highlighted and non-deletable. This message is issued for each percentile change in use and each time TMSINIT is executed. As new IEFTMS9 messages are issued, the previous ones are deleted. When all DSNBs, except for the last one, have been used, all jobs allocating DSNB records abend with S2yy.
Important! Extending the TMC is a critical process which structurally modifies the TMC. The TMSXTEND and TMSFORMT procedures should be performed by the personnel responsible for the installation and maintenance of CA 1.
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