Workflow for data migration
The global-active device (GAD) feature of the Hitachi Virtual Storage Platform
G1000 enables you to perform data migration without interrupting business
operations.
The following figure shows the system configuration for data migration using
global-active device. The storage system that is the migration source
(primary site) must be a VSP G1000, and the storage system that is the
migration target (secondary site) must be a VSP G1000 (or later).
1. Create GAD pairs between the primary and secondary storage systems.
The data on the volumes is duplicated, and the server issues I/O
operations to volumes in both storage systems of the GAD pairs.
2. Monitor the status of the GAD pairs, and make sure that the pair status of
all pairs is PAIR before continuing.
3. On the server, stop I/O to the primary volumes at the primary site.
At this time, do not stop I/O to the secondary volumes at the secondary
site.
4. At the secondary site, suspend the GAD pairs by specifying the S-VOLs.
When you suspend a GAD pair by specifying the S-VOL, the pair status
I/O mode of the P-VOL and S-VOL change as follows:
¢
The pair status of the S-VOL changes to SSWS, and the I/O mode of
the S-VOL changes to Local.
¢
The pair status of the P-VOL changes to PSUS, and the I/O mode of
the P-VOL changes to Block.
5. At the secondary site, delete the GAD pairs by specifying the S-VOLs.
When you delete a GAD pair by specifying the S-VOL, the GAD
reservation attribute is applied to the volume that was the P-VOL. The
volume that was the S-VOL keeps the virtual LDEV ID and continues to
receive I/O from the server.
6. After you have deleted the GAD pairs, at the primary site delete the LU
paths to the volumes that were the P-VOLs. If desired, you can now
8-2
Data migration and volume reuse
Hitachi Virtual Storage Platform G1000 Global-Active Device User Guide
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