Hitachi TAGMASTORE MK-90RD011-25 - Manual (Page 35)

Hitachi Command Control Interface (CCI) User and Reference Guide 17
2.3 Overview of CCI ShadowImage Operations
Figure 2.8 illustrates the ShadowImage configuration. The ShadowImage commands support a
function which links the system operation for the purpose of volume backup among UNIX
servers with the operation management of the server system. For detailed information on
the operational requirements for ShadowImage, please refer to the Hitachi ShadowImage
User’s Guide for the storage system.
„
Pair creation command: Creates a new volume pair. Volume pairs can be created in
units of volume or group.
„
Pair splitting command: Splits a volume pair and allows read and write access to the
secondary volume.
„
Pair resynchronization command: Resynchronizes a split volume pair based on the
primary volume. The primary volume remains accessible during resynchronization.
Restore option: Resynchronizes a split pair based on the secondary volume (reverse
resync). The primary volume is not accessible during resync with restore option.
„
Event waiting command: Used to wait for completion of volume pair creation or
resynchronization and to check the pair status.
„
Pair status display and configuration confirmation command: Displays the pair status
and configuration of the volume pairs, used for checking the completion of pair creation
or pair resynchronization.
Commands Commands
HORCM
(CCI)
HORCM
(CCI)
Host A Host B
Server
software
Server
software
Operation
Management
Operation
Management
Primary/
secondary
volume
Secondary/
primary
volume
Hitachi RAID Storage
Pair generation and re-synchronization
Pair splitting
Command device
Figure 2.8 ShadowImage System Configuration