NonStop S-Series Planning and Configuration Guide (G06.28+)

System Components
HP NonStop S-Series Planning and Configuration Guide—523303-020
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Group ID Switches
Group ID Switches and Stored Group Numbers
Both group ID switches within an enclosure must be set to the same number. When the
enclosure is powered on, the service processor (SP) reads the group ID switches and
stores that group number. If you power the enclosure off and then power it back on, the
SP retains that stored group number of the enclosure.
If, at the time the enclosure is powered back on, the group number shown or its group
ID switches does not agree with the stored group number in the SP:
•
If both group ID switches agree with each other but disagree with the stored group
number, the stored group number is updated.
•
If the group ID switches do not agree with each other but one group ID switch
agrees with the stored group number, the SP assigns the stored group number to
the enclosure.
•
If the group ID switches do not agree with each other and neither group ID switch
agrees with the stored group number, the SP generates an error and does not
assign any group number to this enclosure.
Group Numbers and System Configurations
The group number is part of CRU identification, so if you change the group number of
an enclosure, you change the identification of all CRUs in that enclosure.
For example, if you change group 02 to group 05 and then power on the system with
no reconfiguration, a disk drive that was originally in group 02, module 01, slot 08, is
now in group 05, module 01, slot 08. However, the system configuration still lists that
disk drive as being in group 02. Therefore, all system resources configured for group
02 are considered missing from the system.
If you change the group number of an enclosure, you must also change the system
configuration.