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Hitachi Command Control Interface (CCI) User and Reference Guide 99
2.9.1 Configuration Definition for Cascading Volume Pairs
The CCI software (HORCM) is capable of keeping track of up to seven pair associations per
LDEV (1 for TC/UR, 3 for UR, 3 for SI/Snapshot, 1 for Snapshot). By this management, CCI
can be assigned to seven groups per LU that describes seven mirror descriptors for a
configuration definition file.
Oradb1
Oradb
LDEV
MU#1-2
Oradb2 - 3
MU#3-63
Oradb7~
ShadowImage
TrueCopy
MU#0
MU#1-#3
Oradb4 - 6
UR
Figure 2.46 Mirror Descriptors and Group Assignment
2.9.1.1 Correspondence of the Configuration File and Mirror Descriptors
The group name and MU# which are described in HORCM_DEV of a configuration definition
file are assigned the corresponding mirror descriptors, as outlined in Table 2.13. “Omission
of M
U#” is handled as MU#0, and the specified group is registered to MU#0 on ShadowImage
and TrueCopy. Also, the MU# that is noted for HORCM_DEV in Table 2.13 reflects a random
numberin
g sequence (for example, 2, 1, 0).