HP XP P9500 Storage - Manual (Page 67)

8 Data migration
This chapter discusses using Continuous Access Synchronous to migrate data from one storage
system to another.
Migrate data
Continuous Access Synchronous 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 LU to accommodate other activities (for example, to make
repairs)
•
To relocate LUs in order to balance workloads and distribute I/O activity evenly within or
across storage systems
In a data migration, the entire contents of a volume are copied to the second volume (P-VOL to
S-VOL). The volumes are identical when the copy operation completes. The volumes are then usually
released from the Continuous Access Synchronous pair.
High-availability (HA) software can also be used to complete data migration nondisruptively. To
support this, data migration must be managed through an integrated operation using RAID Manager,
Continuous Access Synchronous, and HA software functions.
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 configuration
procedures are completed. See
“Configuration operations” (page 40) for details.
2. Cause the target volume (S-VOL) to become offline from all attached hosts. The source volume
(P-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 pair or pairs. See
“Create pairs”
(page 49) as needed.
4. When pair status changes to PAIR, the operation is completed. You can monitor the progress
of the operation from the Pair Operations window.
5. If you are not using RAID Manager commands and host software to complete the migration,
continue the following procedure to stop using the P-VOL(s) and switch to the S-VOL(s):
1.
Stop all host updates to the P-VOL(s).
2. When all update activity to the P-VOL(s) has stopped, connect to the MCU, select the
correct CU, and release the Continuous Access Synchronous pair(s).
3. If the P-VOL and S-VOL are attached to the same host, vary the P-VOL offline, then vary
the S-VOL online. Use this order because the P-VOL and S-VOL have the same volume
labels and cannot be online to the same host at the same time.
4. If you want to keep the volumes synchronized, establish the same Continuous Access
Synchronous pair(s) in the reverse direction using the None initial copy option. If the
original P-VOL(s) will be temporarily unavailable for update copy operations, you can
split the new pair(s) (pairsplit-r) so that the new MCU keeps track of changes.
5. Start the applications with the S-VOL(s). When the original P-VOL(s) become available,
you can resynchronize the pair(s).
If the original P-VOL is temporarily unavailable for update copy operations, split the new pair so
that the new primary system keeps track of changes.
Migrate data 67