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Chapter 14. Data migration in zSeries environments 307
Again all these approaches to utilize microcode-based mirroring capabilities require the right
hardware as source and target disk servers.
For completeness it is pointed out that Global Mirror is also an option to migrate data from an
ESS 750 or ESS 800 to a DS8000. This might apply to certain cases at the receiving site
which require consistent data at any time, although Global Copy is used for the actual data
movement. Please note that the consistent copy in the new disk server is not concurrent with
the primary copy except if the application is stopped and all data is replicated.
Another approach to migrate data beyond the scope of volumes is to use software which
migrates data on a logical or data set level and locates the data sets through their respective
catalog entries. This approach is outlined in the following section.
14.3 Data migration based on logical migration
Data migration based on logical migration is a data set by data set migration which maintains
catalog entries according to the data movement between volumes and, therefore, is not a
volume-based migration. This is the cleanest way to migrate data and also allows device
conversion from, for example, 3380 to 3390. It also supports transparently multivolume data
sets. Logical data migration is a software-only approach and does not rely on certain volume
characteristics nor on device geometries.
The following software products and components support logical data migration:
DFSMS allocation management
Allocation management by CA-ALLOC
DFSMSdss
DFSMShsm™
FDR
System utilities like:
– IDCAMS with REPRO, EXPORT/IMPORT commands
– IEBCOPY to migrate Partitioned Data Sets (PDS) or Partitioned Data Sets Extended
(PDSE)
– ICEGENER as part of DFSORT which can handle sequential data but not VSAM data
sets, which also applies to IEBGENER
CA-Favor
CA-DISK or ASM2
Database utilities for data which is managed by certain database managers like DB2 or
IMS™. CICS® as a transaction manager usually uses VSAM data sets.
14.3.1 Data Set Services Utility
DFSMSdss is a common utility which can be used, at this time, not for physical full volume
operations, but for data set level operations. Pointing to certain input volumes, DFSMSdss
can also move data sets in a logical fashion off of certain source volumes.
Example 14-6 DFSMSdss for logical data migration from certain input volumes
//MIGRATE EXEC PGM=ADRDSSU
//SYSPRINT DD SYSOUT=*
//* -------- FROM VOLUMES --------------------------------------- ***
//IN001 DD UNIT=3390,VOL=SER=AAAAAA,DISP=SHR
//IN002 DD UNIT=3390,VOL=SER=BBBBBB,DISP=SHR
//IN003 DD UNIT=3390,VOL=SER=CCCCCC,DISP=SHR
//SYSIN DD *
COPY DS(INC(**) EXCLUDE(SYS1.VTOCIX.*,SYS1.VVDS.*)) -