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8 Chapter 2 Overview of CCI Operations
2.1 Overview
CCI allows you to perform Hitachi TrueCopy and ShadowImage operations by issuing
TrueCopy and ShadowImage commands from the UNIX/PC server host to the Hitachi RAID
storage system. Hitachi TrueCopy and ShadowImage operations are nondisruptive and allow
the primary volume of each volume pair to remain online to all hosts for both read and write
operations. Once established, TrueCopy and ShadowImage operations continue unattended
to provide continuous data backup.
This document covers the requirements for using Hitachi TrueCopy and ShadowImage in HA
configurations. UNIX/PC servers in HA configurations normally support disk duplicating
functions to enhance disk reliability (e.g., mirroring provided by the LVM or device driver,
RAID5 or equivalent function provided by the LVM). UNIX/PC servers also feature hot standby
and mutual hot standby functions in case of failures on the server side. However, mutual hot
standby for disaster recovery has not yet been achieved, since it requires the remote
mirroring function.
Hitachi TrueCopy supports the remote mirroring function, linkage function with the failover
switch, and remote backup operation among servers, all of which are required by UNIX/PC
servers in HA configurations for disaster recovery. For detailed information on TrueCopy
operations, please refer to the TrueCopy User and Reference Guide for the storage system.
ShadowImage supports the mirroring function within a storage system. For detailed
information on ShadowImage operations, please refer to the ShadowImage User’s Guide for
the storage system.