Hitachi TAGMASTORE MK-90RD011-25 - Manual (Page 31)

Hitachi Command Control Interface (CCI) User and Reference Guide 13
2.2.2.2 Restriction for TrueCopy/ShadowImage Cascading Volumes
Pair restore (resynchronization from SVOL (oradb1) to S/PVOL) can only be performed when
the TrueCopy VOL (oradb) is SMPL or PSUS(SSUS), and another PVOL (oradb2) on the S/PVOL
is SMPL or PSUS. If pairresync of S-VOL (oradb1) is performed when the S/PVOL (oradb or
oradb2) is in any other state, the pairresync (-restore option) command will be rejected with
EX_CMDRJE or EX_CMDIOE.
SMPL
or
PVOL
S/P
VOL
SVOL
SVOL
oradb oradb1
oradb2
0
1
TrueCopy TrueCopy
2.2.2.3 Overview of CCI TrueCopy Operations
CCI TrueCopy operates in conjunction with the software on the UNIX/PC servers and the
Hitachi TrueCopy (HORC) functions of the RAID storage systems. The CCI software provides
failover and other functions such as backup commands to allow mutual hot standby in
cooperation with the failover product on the UNIX/PC server (e.g., MC/ServiceGuard,
FirstWatch, HACMP). For the proper maintenance of Hitachi TrueCopy operations, it is
important to find failures in paired volumes, recover the volumes from the failure as soon as
possible, and continue operation in the original system.
Note: For information on the operational requirements for TrueCopy, please refer to the
Hitachi TrueCopy User and Reference Guide for the storage system.