Download Adaptec FS4500 - Hard Drive Array User`s guide

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
Figure 6-2 shows the location of the LIO module LEDs. Table 6-4 on
page 6-8 describes the function of the LEDs on the LIO module.
Output LED—
Indicates output
cable present with
valid FC signal
Input LED—Indicates
input cable present
with valid FC signal
Status LEDs
1234
Figure 6-2 LIO Module LEDs
6-7