Specifying BWO using access method services

If your data sets are accessed in RLS mode, the BWO option must be defined in the ICF catalog. To define BWO in the ICF catalog, use the BWO parameter on the access method services DEFINE CLUSTER statement.

You can specify the BWO parameter as follows:

TYPECICS: The data set is eligible for BWO in CICS®.
NO: The data set is not eligible for BWO.
TYPEIMS: The data set is eligible for BWO in IMS, but CICS treats this as NO.
TYPEOTHER: The data set is eligible for BWO, but CICS treats this as NO.

If you specify BWO(TYPECICS), you must also specify LOG(ALL) and a forward recovery log stream name, LOGSTREAMID(logstream_name)

If you omit the BWO parameter from the DEFINE statement, by default it is UNDEFINED in the ICF catalog, and the BWO attribute from the CICS file resource definition is used.

Note: This is recommended only if you are not using RLS.

All other values, including UNDEFINED, are treated by CICS as the equivalent of BACKUPTYPE(STATIC) in a CICS file resource definition. For simplicity, the CICS terms BACKUPTYPE(DYNAMIC) and BACKUPTYPE(STATIC) are used unless it is necessary to specifically mention the access method services BWO parameters.

The BWO options for the CSD are taken from the ICF catalog if they are defined there, and the system initialization parameters (CDSBKUP, CSDRECOV, and CSDFRLOG) are ignored.