What is needed to use BWO

To use the backup-while-open (BWO) support provided by CICS®, you can use the Data Facility Storage Management Subsystem/MVS (DFSMS/MVS), Version 1 IBM-licensed product, program number 5695-DF1, (or a program product that provides equivalent function), Use Release 2, or later, for data sets used in non-RLS access mode, and Release 3 for data sets used in RLS access mode.

The DFSMSdfp IGWAMCS2 callable services module must be installed in the link pack area (LPA). The IGWABWO module, supplied in SYS1.CSSLIB, must be installed in the LPA, or SYS1.CSSLIB must be included in the link list (do not include the library in the STEPLIB or JOBLIB library concatenations).

You need the DFSMSdfp, DFSMSdss, and DFSMShsm components of DFSMS installed on the processors that perform backup and recovery.

Note:
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During initialization, CICS determines the availability of BWO support by issuing calls to the callable services modules IGWAMCS2 and IGWABWO. CICS also checks on the DFSMSdss release level by calling the DFSMSdss module ADRRELVL. If access to this DFSMSdss module is strictly controlled by an external security manager, such as RACF®, security violation messages are issued against the CICS userid, unless the CICS region userid is authorized to access this module.
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Note that CICS VSAM Recovery MVS/ESA (CICSVR), (program number 5695-0120), which performs forward recovery, must be installed on the processor where forward recovery is to be done. CICSVR is required for forward recovery and backout of CICS VSAM data sets backed up with BWO and concurrent copy functions of DFSMS/MVS.

Table 3 cross-references the storage management component names of DFSMS to the previous names of the individual licensed programs:

Table 3. Cross-reference of DFSMS/MVS product terminology
Component name Full DFSMS/MVS name Previous product name
DFSMSdfp Data Facility Storage Management Subsystem data facility product MVS/DFP
DFSMShsm Data Facility Storage Management Subsystem hierarchical storage manager DFHSM
DFSMSdss Data Facility Storage Management Subsystem data set services DFDSS

Hardware requirements

The concurrent copy function is supported by the IBM® 3990 Model 3 with the extended platform and the IBM 3990 Model 6 control units.

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