HP XP Continuous Access Software - Manual (Page 280)

280 HP StorageWorks Disk Array XP RAID Manager: User’s Guide
Configuration definition for cascading volumes
RAID Manager is capable of keeping track of up to four MU pair
associations per LDEV (one for CA, three for BC). The following figure
shows this configuration.
Correspondence between a configuration file and mirror descriptors
The following table shows how MU usage can indicate that a pair is CA,
BC, or either.
Leaving MU blank means “0, and usable for either a CA or BC pair.” An
explicit 0 (or 1 or 2) means BC only.
HORCM_DEV entries can be in random order.
LDEV
Oradb2
Oradb3
BC MU#0
CA
Oradb1
Oradb
BC / MU#1
BC / MU#2