DIRECTORY AND CATALOG INDEXES field (CATXDACL, CATXMGCL, and CATXSTCL subsystem parameters)

The DIRECTORY AND CATALOG INDEXES field specifies the explicit Storage Management Subsystem (SMS) classes that are to be used for defining VSAM data sets for Db2 catalog and directory indexes. Your SMS storage administrator defines these SMS classes. To use ACS routines for defining these data sets, leave this field blank.

For migration, values that you enter in this field initially apply only for defining new data sets for Db2 catalog and directory indexes.

Table 1. Acceptable values and defaults for columns of DIRECTORY AND CATALOG INDEXES field
Column	DATA CLASS	MGMT CLASS	STOR CLASS
Acceptable values:	Blank or a valid SMS data class name	Blank or a valid SMS management class name	Blank or a valid SMS storage class name
Default:	Blank	Blank	Blank
Update:	None	None	None
DSNZP`xxx`:	DSN6SPRM CATXDACL	DSN6SPRM CATXMGCL	DSN6SPRM CATXSTCL

A blank value in a column directs the CLIST to remove the corresponding storage-management-related parameters from all JCL, AMS, ALLOC, and DDL statements that are used to create data sets and storage groups that are associated with the field. A non-blank value is used by the CLIST to customize the corresponding storage-management-related parameters in all JCL, AMS, ALLOC, and DDL statements that are used to create data sets and storage groups that are associated with the field.

Recommendation: To help performance and recovery, avoid dependency on a single storage device by using an SMS scheme that uses more than one volume serial number.