Storage management facilities required by BWO
The backup while open (BWO) facility requires a number of storage management facilities.
- Storage management subsystem (SMS), part of MVS/DFP Version 3 Release 2 or later, product number 5665-XA3
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SMS is the approach to DASD storage management in which CICS®, by means of the storage management subsystem, determines data placement. In addition, an automatic data manager handles data backup, movement, space, and security.
This is sometimes referred to as DFSMS and complements functions of MVS/DFP and other individual products of the Data Facility product family. For more details about SMS, see the following publications:- z/OS DFSMSdfp Storage Administration describes storage administrator applications.
- z/OS DFSMS Introduction gives an overview of MVS/DFP and its requirements and describes concepts of SMS-managed storage.
Important: If you use DFHSMS to manage your VSAM data sets, you should consider carefully the period after which your CICS VSAM data sets are migrated to primary or auxiliary storage.If a migrated data set has to be recalled for CICS, it can take several minutes from primary storage, or longer from auxiliary storage. While the recall is taking place, the user is locked out, and no other opens or closes on that data set can be performed until the data set has been recalled.
If a migrated data set has to be recalled, CICS issues message DFHFC0989 to the system console, to notify the user that a recall is taking place, and to indicate whether it is from primary or auxiliary storage.
- Data facility hierarchical storage manager (DFHSM), product number 5665-329
- DFHSM is an IBM®-licensed program to manage volumes and data sets. For more details about DFHSM, see z/OS DFSMS Knowledge Center.
- Data facility data set services (DFDSS), product number 5665-327
- DFDSS is an IBM-licensed program used to copy, move, dump, and restore data sets and volumes. For more details about DFDSS, see z/OS DFSMSdss Storage Administration.