Location of buffer pools and compatibility of exit routines

In DBT 2.2 HSSR, buffer pools are allocated above the 16-MB line only for VSAM data sets. In DBT 2.3 HSSR buffer pools are allocated above the 16-MB line for OSAM data sets also only when DFSMS 1.1 or later is used.

Because of these differences, you might need to link-edit your FABHURG1 exit routine or FABHFSU exit routine with the 31-bit addressing mode. For details, see the following topics:

• User record-formatting routine
• System programming interfaces for the requirements for FABHURG1 exit routines
• FABHFSU user exit routine for the requirements for FABHFSU exit routines