Summary Of Logical Data Migration Based On Software Utilities; Combine Physical And Logical Data Migration - IBM TotalStorage DS6000 Series Redbooks

//SYSIN
COPY STORGRP(SG1)
/*
//* ------------------------------------------------------------- ***
//AGAIN
//SYSPRINT DD DUMMY
//SYSUT1
//SYSUT2
//SYSIN
//* ------------------------- JOB END ---------------------------- ***
//
You might keep the job repeatedly executing through the second step AGAIN, where the
same job is read into the system again through the internal MVS reader.
Eventually there remain a few data sets on the source volumes which are always open. These
data sets require you to stop the concerned application, close and unallocate these data sets,
and then run the job in Figure 13-12 once more.
Verify at the end of this logical data set migration that all data has been removed from the
source disk server with the IEHLIST utility's LISTVTOC command.
Again this approach requires you to have the old and new equipment connected at the same
time and most likely over an extended period, except if you push the migration through jobs
like in Example 13-12, in which you can run more than one instance concurrently.

13.3.3 Summary of logical data migration based on software utilities

Problems encountered when not using an allocation manager like system-managed storage
are less flexibility when using esoteric unit names, or complex and time-consuming tasks in
maintaining hard-coded JCL volume names, which need to be changed when creating new
volumes on new disk storage servers. It is recommended that you use system-managed
volumes to overcome the limitations with esoteric unit names and hard-coded volume names
in JCL.
Logical data migration is difficult and can be time-consuming, and it usually requires system
down time. System-managed storage allows for a less difficult data migration, when it is on a
logical level, in order to consolidate not just disk storage servers but also volumes moving to
larger target volumes.

13.4 Combine physical and logical data migration

The following approach combines physical and logical data migration:
Physical full volume copy to larger capacity volume when both volumes have the same
device geometry (same track size and same number of tracks per cylinder).
Use COPYVOLID to keep the original volume label and to not confuse catalog
management. You can still locate the data on the target volume through standard catalog
search.
Adjust the VTOC of the target volume to make the larger volume size visible to the system
with the ICKDSF REFORMAT command to refresh, REFVTOC, or expand the VTOC,
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DS6000 Series: Concepts and Architecture
DD *
DS(INC(**)
EXCLUDE(SYS1.VTOCIX.*,SYS1.VVDS.*))
DELETE CATALOG SELECTMULTI(ANY) SPHERE-
ALLDATA(*) ALLX WAIT(00,00) ADMIN OPT(3) CANCELERROR
EXEC PGM=IEBGENER
DD DSN=WB.MIGRATE.CNTL(DSS#SG1),DISP=SHR
DD SYSOUT=(A,INTRDR)
DD DUMMY
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