• Requirements for a CTG for multiple primary and secondary
systems
In addition to the above requirements, consistency groups of multiple
primary and secondary storage systems must satisfy the following
requirements:
¢
Use VSP Gx00 models, VSP Fx00 models, VSP G1000, or HUS VM in
both primary and secondary storage systems.
¢
A maximum of four primary and secondary storage systems
(respectively) can be used.
¢
Use the firmware program that supports the consistency group
functionality for multiple primary and secondary storage systems.
- If a storage system at the primary site does not support the
consistency group functionality for multiple primary and secondary
storage systems, a pair for a consistency group of one primary and
one secondary storage system is created.
- If a storage system at the secondary site does not support the
consistency group functionality for multiple primary and secondary
storage systems, no pairs can be created.
¢
Use CCI appropriate for operations of consistency groups with multiple
primary and secondary systems.
¢
Pair operations can be performed only from CCI. Pair operations from
Device Manager - Storage Navigator are not supported.
¢
Cascade configurations with Universal Replicator are not supported.
¢
Combination with Compatible FlashCopy® is not supported.
¢
When using a volume in a virtual storage machine, if you want to
create a consistency group of one primary and one secondary storage
system, use volumes in the same virtual storage machine to create a
pair. If you register a pair created in different virtual storage machine
volumes to a consistency group, the consistency group is regarded as
a consistency group of multiple primary and secondary storage
systems.
Split behaviors
This topic describes how to maintain data consistency between secondary
volumes of pairs in the same group when a split command is issued during
I/O processing, and when I/O processing is requested while a split command
is in progress.
Data consistency between secondary volumes of pairs in a group cannot be
ensured when all the following conditions exist:
• A split command is in progress
• The host requested I/O processing
• The microprocessor of the connection destination port for the I/O request
is blocked
Planning for TrueCopy
3-21
Hitachi TrueCopy® User Guide for Hitachi Virtual Storage Platform Gx00 and Fx00 Models
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