Array Unit Id Switch - Sun Microsystems StorEdge D2 Array Best Practices Manual

TABLE 4-1
Position/
Pin No. Function
1 Single Bus
2 040 Disable
3 Power Off Reset
Enable
4 Option
4.2

Array Unit ID Switch

The array unit ID switch is a 10-position switch that sets a unique identification for
each ESM board. The INQUIRY, READ ENCLOSURE STATUS, and READ DEVICE
SLOT STATUS commands in the Vendor Unique Byte read this ID.
Note – If there are two ESMs in an array, set this switch to the same number for
both ESMs because the ID applies to the array as a whole unit.
4-2 Sun StorEdge D2 Array Best Practices Guide • January 2002
Array Configuration Options Switch Settings
Meaning
When the switch is on (position - up), it sets the array to a single bus.
In this mode, the ESM card in Slot 0 controls both drive array busses
and both 53C180s that connect to the drive array buses, ARRAY_1
and ARRAY_2, are enabled. One 53C180 will control the drive
ARRAY_1 bus with drive IDs numbered 0 – 5, the second 53C180 will
control the drive ARRAY_2 bus with drive IDs numbered 8 - 13, and
the bus SAF-TE will be at 15 (Fh).
When the switch is off (dual bus), the ESM card in Slot 0 will control
the drives connected to the drive ARRAY_1 bus. The ESM card in Slot
1 will control the drives connected to drive ARRAY_2 bus. The drives
on both buses will be numbered 8 – 13 to prevent possible conflicts
with SCSI host ID settings, and the SAF-TE device will be at 15 (Fh).
NOTE: In a dual bus configuration, both ESMs must have the switch
set to dual bus mode (position - down).
Setting this switch to on (position - up) disables all SAF-TE chip
services. When this switch is off (position - down), all SAF-TE
functions will operate as required.
Not implemented.
A user defined switch.