Sharing Thin Image Volumes With Global-Active Device - Hitachi VSP G1000 User Manual

• Pairs 1 and 2 are Universal Replicator pairs.
• Pair 3 is a Universal Replicator pair for delta resync.
• Pairs 4, 5, and 6 are Thin Image pairs.
You must create pairs 1 and 2 before creating pairs 5 and 6, but pair 4 can
be created at any time.

Sharing Thin Image volumes with global-active device

You can use a Thin Image (HTI) P-VOL as a global-active device (GAD) P-VOL
or S-VOL.
The following tables list the relationship between Thin Image tasks and GAD
pair status.
Note: If you share GAD volumes with Thin Image volumes, stop I/O to a
volume before storing snapshot data. Snapshot consistency cannot be
guaranteed if you store snapshot data without stopping I/O to the volume.
For more information about GAD, see the Global-Active Device User Guide.
The following table lists the Thin Image tasks you can perform when the P-
VOL is shared with a GAD P-VOL.
COPY
PAIR
PSUS
PSUE
Hitachi Thin Image User Guide for Hitachi Virtual Storage Platform G Series and F Series
I/O
GAD status
mode
Mirror
(RL)
Mirror
(RL)
Local
Block
Local
Overview of Thin Image
Store
Create Restore
snapshot
pair
data
Yes Yes No
Yes Yes No
Yes Yes Yes
Yes Yes No
Yes Yes Yes
HTI task
Delete
snapshot
pair
data
Yes Yes
Yes Yes
Yes Yes
Yes Yes
Yes Yes
Delete
pair
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