Using separate subpools

If you have many VSAM data sets with similar or equal control interval sizes, you might get a performance advantage by replacing a single large subpool with separate subpools of identically sized buffers. Creating separate subpools of the same size for VSAM data sets offers benefits similar to OSAM multiple subpool support.

You can also create separate subpools for VSAM KSDS index and data components within a VSAM local shared resource pool. Creating separate subpools can be advantageous because index and data components do not need to share buffers or compete for buffers in the same subpool.