Product Verification › Customizing the PROCs

Customizing the PROCs

To customize the PROCS, follow these steps:

1. Copy the SVTS and SVTSAS members from the HLQ.CCUUPROC library to the appropriate system PROCLIB.
2. Follow the comments in the members to customize them.

   At your site, if allocations with UNIT=SYSALLDA are not allowed in IGGPRE00 or Dynamic Allocation exit IEFDB401, you may need to add the following DD statement to the SVTS PROC:

   //SYSIN@  DD UNIT=your.DASD.esoteric,SPACE=(TRK,(1,1))
   

3. Update the SYSID=&SYSNAME parameter in the SVTS PROC to a unique value if all of the following are true:
   • CA Vtape will be running on multiple LPARs sharing the same Global VCAT.
   • The operating system names of those LPARs are greater than six characters.
   • The first six characters of those operating system names are not unique.

   When a CA Vtape subsystem is started, the operating system name is combined with a comma and the last digit of the subsystem name to create an internal system ID that is used to enqueue or reserve the Global VCAT and Virtual Volumes. If the system name is greater than six characters, it is truncated to six characters.

   For example, when subsystem SVT1 is started on an LPAR named PRODSYSA, the internal system ID will be "PRODSY,1". If subsystem SVT1 is then started on PRODSYSB, its internal system ID will also be "PRODSY,1". To prevent resource conflicts and corruption of the Global VCAT, each subsystem checks for an enqueue with a QNAME of SVTSX and an RNAME of its internal system ID when started. If the enqueue is not detected, the subsystem issues the enqueue to reserve its internal system ID value. If the subsystem detects that its internal system ID value is already in use, the subsystem terminates after issuing an SVTnI0151E error message.

   You can avoid this problem by updating the SYSID=&SYSNAME parameter in the SVTS PROC to a unique value less than six characters. For example, on LPAR PRODSYSA, update the SVTS PROC to use SYSID=SYSA; on LPAR PRODSYSB, update the SVTS PROC to use SYSID=SYSB.

4. The default SVTSAS PROC has a region size of 64 MB (REGION=64M). The SVTSAS.SVTnPT task (Backstore Engine) may need a higher region size depending on the number of tasks performing backstores and recalls that will be active at the same time.

   If the maximum number of tape drives that CA Vtape will be allowed to use is ten and the group definitions are set up to duplex, then the maximum number of externalization tasks is five. If FullMaxdriveEnforcement is set to Y, then the maximum number of recall tasks is ten. The minimum region size would be five times 4 MB or 20 MB. The maximum region size would be ten times 4 MB or 40 MB. The default region of 64 MB will be sufficient.

   If FullMaxdriveEnforcememt is set to N, then the number of recall tasks will not be limited to the above example of ten. The only limit on the number of recall tasks is the maximum number of physical tape drives available. If there are 32 physical tape drives available, then the maximum region size would be 32 times 4 MB or 128 MB. The default region of 64 MB will not be sufficient whenever a high number of recalls are required.