Auto Assignment Feature; Cross Call Feature - NEC NF2300-SR412E User Manual

2.2

Auto Assignment Feature

If the assigned controller is shut down, the auto assignment feature allows the controller
not assigned to access to any logical disk within the subsystem.
Accordingly, this feature has no meaning if the cross call feature is set to ON.
When an I/O on a logical disk not assigned to the local controller, it is checked whether
the adjacent controller is shut down. If so, the assignment of logical disk to the shut down
controller is released and the logical disk is reassigned to the local controller. The
assignment modification status is retained until the power is turned on again or the
assignment is changed by the management software (NEC Storage Manager).
See "Several Settings on Disk Array (Set of Auto Assignment Mode)" in "Guide to
Setting of NEC Storage Manager Configuration" for the use of the management software
(NEC Storage Manager).
2.3

Cross Call Feature

The disk array unit originally has the dynamic cross call feature.
The feature may be made on or off.
(1) Default state:
Off
(2) Cross call enable state:
The cross call feature is set to ON.
In the state, both controllers can access to every logical disk.
(3) Modification method:
The cross call feature can be set by using the management software.
See "Several Settings on Disk Array (Set of Cross Call)" in "Guide to Settings of
NEC Storage Manager Configuration" for the use of the management software (NEC
Storage Manager).
Note 1: It is recommended that the alternate path feature by middleware such as NEC
Note 2: To use the access control feature, the cross call feature must be set to ON.
Storage PathManager is made valid from the viewpoint of data protection if
the cross call feature is set to ON.
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