Note: For proper maintenance of TrueCopy operations, it is important to
determine if there are any faults in paired volumes, recover the volumes from
the failures as soon as possible, and continue operation in the original
system.
Note: For information about the operational requirements and specifications
for TrueCopy, please see the Hitachi TrueCopy® User Guide for your storage
system.
TrueCopy takeover commands
Figure 6-5 Server failover system configuration on page 6-10 illustrates a
high-availability (HA) environment. When a server software error or a node
error is detected, the HA failover software causes the cluster manager (CM)
to monitor server programs and causes the CM of the standby node to
automatically activate the HA control script of the corresponding server
program. The HA control script usually contains database recovery
procedures, server program activation procedures, and other related recovery
procedures. The TrueCopy CCI takeover commands are also activated by the
HA control script.
Figure 6-5 Server failover system configuration
Legend
• CM (Cluster Manager): Demon process that keeps the consistency of the
cluster by monitoring the node and server program in the cluster.
6-10
Data replication operations with CCI
Command Control Interface User and Reference Guide
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