Real-time Tape Processing › How to Use Scratch Pool Management › Scratch Pool and Access Rules

Scratch Pool and Access Rules

Scratch pools are assigned by adding control statements to two hlq.CTAPOPTN members:

• TMOSCRxx defines the tape pool name and the ranges of volumes that are assigned to the tape pool
• TMONSMxx defines the rules for access to a tape pool

TMSINITD reads these two members during CA 1 initialization. TMSINITD can be executed in batch mode to verify that any changes to these members are correct before CA 1 initialization.

Note: For more more information about the TMSINIT and TMSINITD programs, see the Utilities and Reports Reference Guide.

A scratch pool can be directly requested by specifying the scratch pool name in the JCL VOL=SER= parameter, for example:

//ddname   DD DSN=tape.dsname,DISP=(NEW,CATLG),UNIT=cart,
//         VOL=SER=poolnm,LABEL=(1,SL)

Due to operating system edits on the VOL=SER= parameter, the specified scratch pool name must be six characters or less. If you use scratch pooling, at least one scratch pool assignment control statement must be specified in the TMONSMxx member. Assignment control statements are not necessary for scratch pools that are intended to be directly specified in the JCL if the TMONSMxx member references at least one scratch pool.

Notes:

• The specified unit must be able to satisfy at least one of the tapes from the specified pool.
• You may only specify one pool name in the VOL=SER= field, and no other volsers can be added in addition to the scratch sub-pool name.
• You cannot have two or more DD statements in the same step pointing to the same scratch subpool via the VOL=SER= specification. You may have two or more DD statements using VOL=SER=poolid, but they must be different pool names.

Once CA 1 is installed, you can maintain these members using the CA 1 ISPF facility that is described in the section Using Online Inquiry and Update Facilities.