z/OS V1R8 DFSMS Technical Update - IBM Redbooks

DFSMShsm invokes the DFSMSdss COPY FULL function to perform a full volume copy of
the data from the source devices in a copy pool to the target devices in a copy pool backup
storage group.
DFSMShsm invokes the DFSMSdss physical data set COPY function to perform a fast
replication recovery at the data set level from the target devices in a copy pool backup
storage group to the source devices in a copy pool.
Related DFSMShsm commands
Three new DFSMShsm commands were being introduced in z/OS DFSMS V1.5 to support
this new function:
► FRBACKUP
Create a fast replication backup version for each volume in a specified copy pool. This
command is not supported as part of automatic backup or dump. It is invoked by entering
the command at the operator console, HSEND TSO command, and batch or by a program
through the ARCHSEND macro interface.
► FRDELETE
Delete one or more unneeded fast replication backup versions.
► FRRECOV
Use fast replication to recover a data set, single volume, or a pool of volumes from the
managed backup versions.
Note: Recovery can be performed at the volume or copy pool level, and since z/OS
DFSMS V1.8 at the data set level.
ISMF is updated to support these enhancements to SMS. The DFSMShsm LIST and QUERY
commands and the ARCXTRCT macro are also modified to aid you in the use and monitoring
of the fast replication backup versions.
DFSMSdss support
DFSMShsm invokes DFSMSdss to invoke fast replication support. The control is returned to
DFHSMhsm after the fast replication has been initiated for all of the volumes (within minutes).
If a volume failed, DFSMShsm messages are issued.
DFSMSdss was enhanced to support the following functions:
► Individual data set restore for extended format VSAM data sets, including extended format
linear striped data sets, which are often used by DB2 customers.
► Provides a new FASTREPLICATION(REQUIRED) keyword.
► Callers of DFSMShsm may specify the new DFSMShsm keyword NOVTOCENQ to
indicate no volume serialization (no reserve on the VTOC) to DFSMSdss.
Note: The NOVTOCENQ must only be used when another utility, such as DB2, is
providing the serialization. If it is used improperly, the results can be disastrous.
► Bypass security verification options during full volume copy.
What is a copy pool
A copy pool is an SMS construct that defines which storage groups should be processed
collectively by the DFSMShsm function. A copy pool can contain the names of up to 256
Chapter 7. DFSMShsm fast replication 175