Migration overview
TrueCopy can be used to move data from one system to another. Data is
typically migrated for the following reasons:
• To copy data to a new volume
• 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
You do not need to use host migration software is unnecessary for data
migration when using TrueCopy. Also, TrueCopy data migration does not
affect the host.
In a data migration, the entire contents of a volume are copied to the
secondary volume (P-VOL to S-VOL). The volumes are identical when the
copy operation completes. The volumes are then usually released from the
TrueCopy pair.
If you need to migrate data from other vendors' storage systems to a VSP
G200, G400, G600, G800 or VSP F400, F600, F800 storage system, contact
Hitachi Data Systems customer support.
Migrating data
1. Make sure that the data path is installed, and TrueCopy configuration
procedures are completed. See
Chapter 5, TC configuration on page 5-1
for details.
2. Vary the target volume (S-VOL) offline from all attached hosts. The
source volume (P-VOL) can remain online.
3. In the storage system having the volume to be migrated, add a remote
connection and register the secondary system.
4. Monitor the progress status of the initial copy operation and the pair
status. Open the Remote Replication window and View Pair
Synchronization Rate window and update the windows as necessary.
Wait until the initial copy operation is completed and the status changes
from COPY to PAIR. When the status changes to PAIR, the primary and
secondary volumes become identical.
5. If you are not using CCI commands and host software to complete the
migration, continue the following procedure to stop using the P-VOLs and
switch to the S-VOLs:
a. Stop all host updates to the P-VOLs.
b. When all update activity to the P-VOLs has stopped, connect to the
primary system, select the correct CU, and release the TrueCopy
pairs.
c. If the P-VOL and S-VOL are attached to the same host, vary the P-
VOL offline, and 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.
8-2
Data migration
Hitachi TrueCopy® User Guide for Hitachi Virtual Storage Platform Gx00 and Fx00 Models
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