Contents; Data Migration; Migrate Data - HP XP P9500 User Manual

8 Data migration

This chapter discusses using Continuous Access Synchronous Z to migrate data from one storage
system to another.

Migrate data

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
make repairs)
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
1. Make sure that the data path is installed, and Continuous Access Synchronous Z configuration
procedures are completed. See
2. Vary the target volume (R-VOL) offline from all attached hosts. The source volume (M-VOL) can
remain online.
3. 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
(page 55)
4. When pair status changes to Duplex, the operation is completed. You can monitor the progress
of the operation from the Pair Operations window.
5. 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):
1. Quiesce all applications using the M-VOL(s).
2. 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).
3. 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.
4. If an R-VOL contains more cylinders than its M-VOL, update the R-VOL volume table of
contents (VTOC) using ICKDSF/REFORMAT.
5. 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.
6. 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.
72 Data migration
"Configuration operations" (page 45)
as needed.
for details.
"Create pairs"