Adaptec FS4500 User Guide - Page 62

Gb/sec Operation, Daisy-chaining FC Storage Enclosures, Speed Mismatches between Enclosures

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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 Status LEDs 1 2 3 4 Figure 6-2 LIO Module LEDs Input LED-Indicates input cable present with valid FC signal 6-7

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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
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.
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