2. I/O requests are received from each application in the open-system
server to update data in each volume.
3. The TC copy operation is performed in the consistency group.
When a pair is created, the pair is assigned to a consistency group. For
information on creating consistency groups of multiple primary and secondary
storage systems and assigning TC pairs to a consistency group, see the
Command Control Interface User and Reference Guide and the Command
Control Interface Command Reference.
System configurations for consistency groups
The following table shows the system configuration for which data
consistency between secondary volumes in a consistency group of multiple
primary and secondary storage systems is guaranteed.
Update sequence of data in a higher
system*
Guaranteed range of data consistency
between secondary volumes
Update sequence of data is guaranteed
between servers
TC secondary volumes in multiple storage
systems at secondary sites
* If the update sequence of data in a higher system is not guaranteed (data update
sequence is unnecessary), data consistency between secondary volumes is not
guaranteed.
Registering pairs to a new consistency group
This topic describes how to configure a consistency group of multiple primary
and secondary storage systems, and to register TC pairs.
When creating a new TC pair
1. Create CCI configuration definition file C for a configuration of multiple
primary and secondary storage systems.
2. In CCI, specify the consistency group for registration, and register TC
pairs using CCI configuration definition file C created in step 1.
When using existing TC pairs
1. To use existing TC pairs from CCI, create CCI configuration definition file
A.
2. In CCI, split pairs using CCI configuration definition file A created in step
1.
3. In CCI, resume pair operation using CCI configuration definition file A
without specifying a consistency group.
4. In CCI, split pairs using CCI configuration definition file A.
5. Create CCI configuration definition file C for a configuration of multiple
pairs of storage systems.
6. In CCI, register pairs to a consistency group, and resume pair operation
using CCI configuration definition file C.
Planning for TrueCopy
3-19
Hitachi TrueCopy® User Guide for Hitachi Virtual Storage Platform Gx00 and Fx00 Models
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