Adaptec AAR-21610SA Reference Manual page 260

As the example shows, the fan status display contains the
following columns:
I
Enclosure
I
Fan
I
Status
The following sections describe the information that the
enclosure show fan command can display in these columns.
The Enclosure and Fan Columns
The Enclosure column displays the ID associated with the enclosure
management device that you specified on the command line. If you
did not specify an ID, the enclosure show fan command
displays the IDs for all enclosure management devices connected to
the controller. In the example, the enclosure show fan
command displays enclosure management device IDs 0 and 1.
The Fan column displays the unit number associated with the fan
that you specified on the command line. If you did not specify a
unit number, the enclosure show fan command displays the
unit numbers for all fans on the enclosure management device or
devices. In the example, there is one fan (unit 0) each on enclosure
management devices 0 and 1.
The Status Column
The Status column displays the status for each fan listed in the
display. The enclosure show fan command can display the fan
status values listed in
Status
OK
BAD
NOT INSTALLED
UNKNOWN
Table 9-4.
Table 9-4 Fan Status Values
Meaning
The fan is operational. In the example, fan 0 on
enclosure management device 0 is operational.
The fan is not working properly.
The fan is not installed. In the example, fan 0 on
enclosure management device 1 is not installed.
The status of the fan is not reportable. Or, the fan
status is unknown.
enclosure Commands
9-27