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Most of these benefits also apply to migration efforts controlled by the customer when utilizing TDMF or FDRPAS in customer-managed systems.

To summarize: Piper for z/OS is an IGS service offering which relieves the customer of the actual migration process and requires customer involvement only in the planning and preparation phase. The actual migration is transparent to the customer’s application hosts and Piper even manages a concurrent switch-over to the target volumes. Piper is neutral to the disk storage vendors and works for all devices supported under z/OS or OS/390. Piper will soon provide a FICON-only configuration since the DS6800 only supports FCP FICON and not ESCON.

Data migration with z/OS Global Mirror

Another alternative is z/OS Global Mirror (XRC). XRC is an asynchronous solution that has a mode for disaster recovery solutions as well as a particular migration mode of SESSIONTYPE(MIGRATE). This mode does not require the customer to plan for a JOURNALs configuration at the secondary site, which is mandatory for D/R solutions based on XRC.

	Production systems
ANTAS001	OS/390
ANTAS002	zOS

zLINUX

zVM no minidisks

VSE/ESA

Director

ESCON

FICON

Source

Disk Primary subsystems Volume

ESCON

Target

Secondary Disk

Volume Servers

SDM LPAR

FICON

XRECOVER XRECOVER

SDM1

SDM2

Figure 13-3 Data Migration with z/OS Global Mirror (XRC)

When coming from ESCON connectivity, it might be a good time to switch to FICON during the data migration, even though this makes the migration a bit more complex. XRC is the right vehicle to perform the migration transparently, and for an online data migration approach it is almost non-disruptive. The application only needs to shut down for the actual switch to the

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