PRIMARY QUANTITY field (PRIQTY subsystem parameter)

The PRIQTY subsystem parameter specifies the amount of primary space that is to be allocated for archive log data sets. Start of changeThe units for this parameter are specified in cylinders.End of change

Acceptable values: Start of change1–999999 1End of change
Default: Start of change125End of change
Update: option 43 on panel DSNTIPB
DSNZPxxx: DSN6ARVP PRIQTY
Notes:
  1. Start of changeIf the specified values exceeds 4369, Db2 issues message DSNT580I to indicate that an environment for allocating LARGE or EXTENDED-FORMAT data sets is required.End of change
Start of changeFor subsystems that are migrated from Db2 11, the PRIMARY QUANTITY field is determined according to the following rules:
Table 1. PRIQTY values for subsystems that are migrated from Db2 11.
ALCUNIT at migration How PRIQTY is determined in Db2 12
BLK If the Db2 11 PRIQTY value is blank, the value is first calculated as in Db2 11 and then converted to cylinders.

Otherwise, the Db2 11 PRIQTY value is converted to cylinders.
TRK The Db2 11 PRIQTY value is converted to cylinders.
CYL The Db2 11 PRIQTY value is used unchanged.
End of change

By default, DFSMS Direct Access Device Space Management (DADSM) limits the space allocation on a single volume to less than 65535 tracks. Therefore, if the archive log data set size can be greater than or equal to 65535 tracks, you need to specify a primary space quantity of less than 65535 tracks. This action forces the archive log data set to extend to a second volume.

Alternatively, the archive log data sets can be allocated by a DFSMS data class that has a DSNMTYP (data set name type) setting of LARGE or EXT. In this case, you can specify a primary space quantity larger than 65535 tracks without extending to a second volume. LARGE indicates that data sets in the data class are to be allocated in large physical sequential format. EXT indicates that data sets in the data class are to be allocated in extended physical sequential format. A setting of EXT is recommended, and it is required for striping of data sets. If you specify EXT, also set the IFEXT (if extended) parameter to R (required) rather than P (preferred).