IBM DS6000 Series manual Data migration within the system-managed storage environment

selection filters, to copy all data sets onto cartridges (ABACKUP) and then restore the aggregate. This is nothing but the group of data sets which have been selected through filtering, put back onto the new DS8000 storage servers. For more information, see the redbook DFSMShsm ABARS and Mainstar Solutions, SG24-5089.

System utilities don’t play an import role any longer since DFSMSdss incorporated the capability to manage all data set types for copy and move operations in a very efficient way. In a VSE/ESA environment, VSE/VSAM functions are still used like 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.

13.3.2 Data migration within the system-managed storage environment

System-managed storage or SMS manages volumes and storage groups (SG) and allocates data sets based on a policy or rules to 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 which decides whether this volume or that SG is eligible to receive new data set allocations.

ESCON

A	B	C
	ESS E20
	SG1

	ESCON
D	E	F
	ESS E20
	SG2

Figure 13-7 SMS Storage Groups - migration source environment

To explain this approach, Figure 13-7contains two SGs, SG1 and SG2, which are distributed over three storage controllers. Assume these three storage controllers are going to be consolidated into a new DS6800 storage server, and that the number of volumes will be consolidated from 6 down to two, with the respective capacity as displayed in Figure 13-8.

Chapter 13. Data Migration in zSeries environments 265