HP StorageWorks 2300 Disk System - Manual (Page 85)

Configuration 85
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Setting DIP Switches
Two DIP switches on left slot BCC determine bus architecture and some
bus behavior. If that BCC is removed, then the DIP switches on the
other BCC define the bus. See Table 8 for a description of switch
settings.
Note The switch settings on both BCCs must match. If the disk
system is being connected to an HP-UX system, the
switch should be set to SES mode. If the disk system is
being connected to a Netserver, the switch should be set
to SAF-TE mode.
If the BCC self-test detects any discrepancy, the buzzer sounds 4 or 5
times, and the BCC fault and system fault LEDs flash. If the system is
starting up, the disks do not spin up. If the system is operating, the disks
and second BCC continue to operate.
Table 8. DIP Switch Settings
Switch Bank 1 Off - | ON = 0
1 Full Bus Creates a single bus of up
to 14 disk drives Splits the bus into two
buses,
up to 7 disk drives each
2 SES/SAF-TE SAF-TE Mode (SAF-TE
mode is the default. For
HP-UX using EMS, set
to SES) SES mode
Switch Bank 2 Off - | ON = 0
1 Bus Reset: Hot
Swap Disk Automatically issues a
SCSI bus reset when a
disk is removed or
inserted Lets the host detect
change and determine
action
2 Bus Reset:
Power Fail Issues a SCSI reset
when the power
supply/fan module
indicates it will go
offline
3 Bus Reset:
Hot Swap BCC Automatically issues a
SCSI bus reset when a
BCC is removed or
inserted Lets the host detect
change and determine
action