6-7
Fibre Channel Storage Enclosures (FC4100)
2 Gb/sec Operation
The LIO module operates in both 1 and 2 Gb/sec FC modes. The
FC loop speed is selected by setting LIO switch S1.2. When the
switch (located on the LIO module), is set for 2 Gb/sec, the LIO
module and entire enclosure will operate at 2 Gb/sec.
The LIO module does not support auto-negotiation of the FC loop
speed.
Daisy-chaining FC Storage Enclosures
You can daisy-chain Adaptec FC Storage Enclosures to a total of
120 disk drives.
Speed Mismatches between Enclosures
When Storage Enclosures are daisy-chained together, all enclosures
must be set to the same FC loop speed. The FC loop speed is
determined by the first host-connected enclosure in the chain.
If a down-stream enclosure is set incorrectly, the loop opens at that
enclosure; that enclosure plus all the enclosures behind it are
invisible to the host.
Option Slot Loop AL_PA Assignments
The option slot modules and HBAs can be hard-assigned to any of
these FC loop identifiers: 0, 1, 122, 123, 124, or 125 (decimal).
LIO Module LEDs
shows the location of the LIO module LEDs.
describes the function of the LEDs on the LIO module.
Figure 6-2 LIO Module LEDs
Output LED—
Indicates output
cable present with
valid FC signal
Input LED—Indicates
input cable present
with valid FC signal
Status LEDs
1 2 3 4
