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Scratch tapes

STKSUPP cannot determine the appropriate location for scratch tapes.

Therefore the STKSCR global parameter that is specified in the SMMSYSxx PARMLIB member defines a default designation for the following scratch tapes: standard-label tapes, non-labeled tapes, ASCII tapes, and non-standard-label tapes.

Related topic

STKSUPP—split unit affinity specifications over devices

Each type of scratch request can be directed to any silo (operand IN), a specific silo ID (nnn), or to devices that reside outside of silos (operand OUT). For example, the following specification directs standard-label scratch tapes to silo devices and directs all other scratch tapes to non-silo devices:

STKSCR=(IN,OUT,OUT,OUT)

In the following job, without STKSUPP and the preceding STKSCR parameters, all tapes would have to be moved to the device that is associated with DD1.

//STEP10 EXEC PGM=....
//DD1   DD    DSN=DSN1,UNIT=CART,DISP=NEW,LABEL=(1,SL)
//DD2   DD    DSN=DSN2,UNIT=AFF=DD1,DISP=NEW,LABEL=(1,NL)
//DD3   DD    DSN=DSN3,UNIT=AFF=DD2,DISP=NEW,LABEL=(1,NL)
//DD4   DD    DSN=DSN4,UNIT=AFF=DD3,DISP=NEW,LABEL=(1,SL)
//DD5   DD    DSN=DSN5,UNIT=AFF=DD4,VOL=SER=SILOB1,DISP=OLD

With the preceding STKSCR parameters specified, affinity separation splits the scratch requests into two groups: all standard-label scratch tapes and all other scratch tapes. It also splits out DD5, because it resides in silo B.

 

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BMC AMI Storage Allocation 8.1