SMS-managed storage groups are defined in ACS code and cannot be changed.

DFSMS-managed subpooling is a method of dividing these storage groups into pools to improve data set allocation and performance. This functionality is limited to denying volumes outside of a DFSMS-defined pool. Volume selection cannot be directed outside of the data set’s current storage group. If multiple pools are specified, the first pool with sufficient space for the data set is assigned. The first specified pool is the primary pool; all other pools are alternate pools.

Subpools are defined on SET statements. INC/EXC statements that follow a SET statement identify the devices to be included in or excluded from a subpool.

To change SMSPOLxx parameters by using MainView SRM SET statements, issue the following SET statement:

SET POOLNAME=xxxxxxxx[VOL={xxxxxx,xxxxxx,...}]

In the POOLNAME parameter,xxxxxxxx is the name to be assigned to a pool. In the VOL parameter,xxxxxxxx represents each volume serial number (up to 15 total).