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306 Chapter 4 Performing CCI Operations
4.17 Group Version Control for Mixed Storage System Configurations
Before executing each option of a command, CCI checks the facility version of the Hitachi
storage system internally to verify that the same version is installed on mixed storage system
configuration. If the configuration includes older storage systems (e.g., 9900), this method
may not meet the requirements for the mixed storage system environment, because the
older storage system limits the availability enhancements in later facility versions. If the
facility versions of the storage systems are different, the user will not be able to use
USP/NSC-specific facility, because CCI applies the minimum version to all storage systems.
To expand the capability for mixed storage system configurations and avoid problems such as
this, CCI supports the following “group version control” to manage a version for each group.
CCI (HORCM daemon) makes a facility version for each group based on a configuration
file at the start-up of HORCM.
In a mixed storage system configuration, if the facility version of the storage systems
(e.g., USP/NSC and 9900V) is different on a group, CCI will apply the minimum version
for each group (see Figure 4.75).
9900V facility version = N
USP/NSC facility version = N+1
Mixed subsystem configuration
Facility version = N
for group A on Conf.file
Facility version = N
for group B on Conf.file
Facility version = N+1
for group C on Conf.file
Figure 4.75 Definition of the Group Version