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296 Chapter 4 Performing CCI Operations
4.16 Protection Facility
The Protection Facility permits main operations to volumes that the user can see on the
host, and prevents wrong operations. CCI controls protected volumes at the result of
recognition of protection. CCI recognizes only volumes that the host shows. For that purpose
current Hitachi SANtinel is provided for the CCI environment.
It is not possible to turn ON or OFF the Protection Facility from CCI. The Protection Facility
ON/OFF is controlled by Remote Console/SVP or SNMP. The Protection Facility uses an
enhanced command device that the user defines using the LUN Manager remote console
software (or SNMP). When the user defines the command device, the Protection Facility is
turned ON or OFF to each command device, which has attribute to enable Protection
Facility. CCI distinguishes the attribute ON from OFF when CCI recognizes the command
device. Figure 4.72 shows the definition of protected volumes.
Note:
If the command device is set to enable protection mode, there is no impact on CCI
operations. CCI controls pairs under current specification.
Permitted volumes
Volumes on Host view
via LUN Security
Volumes on Horcm.conf via
protection “On” command device
Protected volumes
HOST1
HOST2
Figure 4.72 Definition of the Protection Volume
4.16.1 Protection Facility Specification
Only the permitted volumes must be registered in horcm.conf. When the user makes the
horcm.conf file, the user can describe volumes from only view that host shows. CCI manages
mirror descriptor (Hitachi TrueCopy, ShadowImage/MU#0/1/2) as the unit. The Protection
Facility has two specifications: one must be volume that the user can see from host such as
Inquiry tool, and the other must be mirror descriptor volume that was registered in
horcm.conf. Table 4.50 shows the registration for the mirror descriptor.