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5.6.4.3 Moving a VSAM Catalog to a Different DASD Type
VSE/VSAM provided no facility for moving a catalog to a different device type or
volume serial number. OS/390 VSAM provides this facility for ICF catalogs via
the AMS REPRO and EXPORT/IMPORT commands. Using the REPRO function,
you may specify the old catalog as the input and the new catalog as output. The
new catalog must already have been defined but it may be a different DASD
device type and it
must
be a different volume serial number. Moving the catalog
does not move the data sets that exist on the old catalog volume.
REPRO has two options, MERGECAT and NOMERGECAT. MERGECAT will
transfer entries from one catalog to another, deleting the entries from the source
catalog. If there is a failure during MERGECAT, the target catalog contains the
only valid entries for some of your data sets. For this reason, do not delete the
target catalog simply because the MERGECAT failed. If the failure was caused by
errors external to catalog management and access method services, simply
rerun the REPRO MERGECAT job.
NOMERGECAT will transfer entries to the target catalog but not delete them from
the source catalog. Therefore, data set entries will exist in both catalogs. If there
is a failure during the process, you cannot simply resubmit the job because
REPRO NOMERGECAT copies the source catalog into an empty target catalog.
During the REPRO process, catalog pointers in VSAM VVR entries will be
changed to point to the target catalog. Before you restart the REPRO
NOMERGECAT, steps must be taken to remove the duplicate data set entries
that are now in the source catalog and change the VSAM VVR pointers back to
the source catalog. After a REPRO is run, the target catalog is meant to be used
as the active catalog.
You could also use EXPORT/IMPORT to move an ICF catalog to another device
but you cannot change the catalog name during the process. You can use
EXPORT/IMPORT or REPRO to move data sets. Before using REPRO on ICF
catalogs, you should refer to
Managing Catalogs
, SC26-4914, chapter 4 and
DFSMS/MVS Access Methods Services for ICF
SC26-4906 for further details.
5.6.5 VSAM Functional Differences
5.6.5.1 Areas of Consideration
The following list summarizes VSE/VSAM functions that are either not supported
by OS/390 VSAM or are implemented in a significantly different fashion. Each
item is discussed in the text following this list.
•
FBA DASD (a general change, not specific to VSAM)
•
Catalog structures
− NOIMBED option
− Shared volume ownership
•
AMS commands
− CANCEL command
− DELETE IGNOREERROR
− SYNCHK parameter
− XXL KSDS (new in VSE/ESA 2.3, greater than 4GB KSDS)
− COMPRESS (new in VSE/ESA 2.2, VSAM record compression)
•
VSAM CISIZES and blocksizes
Chapter 5. Disk and Tape Storage Considerations 119