IBM DS8000 manual Hierarchical Storage Manager, DFSMShsm, System utilities

LIDD(IN001,IN002,IN003)	-
DELETE PURGE CATALOG SELECTMULTI(ANY) SPHERE-
WAIT(0,0) ADMIN OPT(3) CANCELERROR

/*

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Example 14-6depicts how to migrate all data sets from certain volumes. The keyword is LOGINDDNAME, or LIDD, which identifies the volumes from where the data is to be picked. There is no output volume specified, although it is also possible to distribute all data sets from the input or source volumes to a larger output volume or to more than one output volume. Example 14-6assumes a system-managed environment. Here the system would automatically place the output data sets according to what the Automatic Class Selection Routine (ACS) assigns. The next section is more specific on how this approach works.

14.3.2 Hierarchical Storage Manager, DFSMShsm

If the number of volumes is rather small and the source volume’s data sets are all managed by DFSMS/MVS, which implies that the data set is managed through Management Classes, you might consider utilizing DFSMShsm to migrate all data sets off the source volumes.

During recall the data set would then be allocated onto the new volumes, provided that the source volumes are disabled for new allocations in a system-managed environment. This approach is not practical for large data migration scenarios.

Another variation of DFSMShsm to migrate data on a logical data set level is to utilize Aggregate Backup and Recovery (ABARS). ABARS allows you, through powerful data selection filters, to copy all data sets onto cartridges (ABACKUP). Subsequent ARECOVER then restores the aggregate. This is nothing but the group of data sets which have been selected before through filtering, put back onto the new DS8000 storage servers. For more information, see the redbook DFSMShsm ABARS and Mainstar Solutions, SG24-5089.

14.3.3 System utilities

System utilities don’t play an import role any longer in large scale migrations since DFSMSdss incorporated the capability to manage all data set types for copy and move operations in a very efficient way. In some instances DFSMSdss still calls some system utility functions, though. IDCAMS REPRO and EXPORT/IMPORT still have some popularity. During both operations, REPRO or EXPORT/IMPORT which includes a REPRO step, perform data set reorganization. System utilities are an integral part of z/OS and free of charge.

In a VSE/ESA environment, VSE/VSAM functions are still used, such as REPRO or EXPORT/IMPORT, to copy and move data sets. There are also other software vendor utilities to manage data migration. An elegant migration approach that can be used when disks are system-managed is outlined in the following section. This approach assumes that the old and new disk servers can be configured concurrently to the concerned host servers.

14.3.4 Data migration within the System-managed storage environment

System-managed storage (SMS) manages volumes and storage groups (SG) and allocates data sets based on a policy or rules for certain storage groups (SG). Certain volumes within an SG or within more than one SG are eligible for new data set allocations. These SMS volumes and SMS SGs also maintain a status that decides whether this volume or that SG is eligible to receive new data set allocations.

308DS8000 Series: Concepts and Architecture