8 Data migration
This chapter discusses using Continuous Access Synchronous Z to migrate data from one storage
system to another.
Continuous Access Synchronous Z can be used to move data from one system to another. Data is
typically migrated for the following reasons:
To load data onto new or scratch volumes (for example, to a new or upgraded storage system)
To temporarily move data from an LDEV to accommodate other activities (for example, to
To relocate LDEVs in order to balance workloads and distribute I/O activity evenly within or
across storage systems.
Continuous Access Synchronous Z operations within one P9500 can only be performed if the
Business Copy Z option is not active on the storage system. If you are migrating data between
storage systems using P/DAS, both storage systems must be the same type (P9500).
In a data migration, the entire contents of a volume are copied to the second volume (M-VOL to
R-VOL). The volumes are identical when the copy operation completes. The volumes are then usually
released from the Continuous Access Synchronous Z pair.
If you need to migrate data from other vendors' storage systems to a P9500 system, contact your
HP account team.
Procedure 21 To migrate data from one volume to another
Make sure that the data path is installed, and Continuous Access Synchronous Z configuration
procedures are completed. See
Vary the target volume (R-VOL) offline from all attached hosts. The source volume (M-VOL) can
Using Remote Web Console, connect to the storage system where the volume to be migrated
is located and create the Continuous Access Synchronous Z pair or pairs. See
When pair status changes to Duplex, the operation is completed. You can monitor the progress
of the operation from the Pair Operations window.
Use the IBM P/DAS host software function to redirect all application I/Os to the R-VOL(s)
nondisruptively. If the host system does not support P/DAS, use the following procedure to
stop using the M-VOL(s) and switch to the R-VOL(s):
Quiesce all applications using the M-VOL(s).
When all update activity to the M-VOL(s) has stopped, connect to the MCU, select the
correct CU, and release the Cnt Ac-S Z pair(s).
If the M-VOL(s) and R-VOL(s) are attached to the same host, vary the M-VOL(s) offline first,
and then vary the R-VOL(s) online. The M-VOL(s) and R-VOL(s) have the same VOLSERs
and cannot be online to the same host(s) at the same time.
If an R-VOL contains more cylinders than its M-VOL, update the R-VOL volume table of
contents (VTOC) using ICKDSF/REFORMAT.
If you want to keep the volumes synchronized, establish the same Cnt Ac-S Z pair(s) in
the reverse direction using the No Copy initial copy option. If the original M-VOL(s) will
be temporarily unavailable for update copy operations, you can suspend the new pair(s)
so that the new MCU keeps track of changes.
Start the applications with the R-VOL(s). When the original M-VOL(s) become available,
you can resynchronize the pair(s) using the Resume Pair dialog box.
"Configuration operations" (page 45)