Adaptec FS4500 User Guide - Page 57

About the Fibre Channel Storage Enclosure, Disk Drive Spin-up Sequence, I/O Modules

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Fibre Channel Storage Enclosures (FC4100) About the Fibre Channel Storage Enclosure Disk Drive Spin-up Sequence The two APC modules in the Storage Enclosure provide enough power for 12 disk drives to spin up simultaneously. If one APC fails, drives 1-3 will spin up first, followed by drives 4-6, drives 7-9 and drives 10-12, with a 6-second delay between each set. See Drive Slot Numbers on page 1-5 for the location of each drive slot. I/O Modules The Adaptec FC Storage Enclosure can accommodate two LIO modules, although it is possible to have only one. LIO modules are a combination of an LRC3 module and a copper or optical module. The LIO modules are located on the back of the Storage Enclosure, as shown in Figure 6-1. FC I/O Modules Figure 6-1 FC I/O Modules The Input connector is the primary FC Loop Input port, and the Output connector is available for FC loop expansion output. A loop-back module is not required, since the I/O expansion module automatically enables the expansion/output connector when valid FC signals are present. The LIO JBOD module is used for FC JBOD applications, and has two connectors on it, labelled Input and Output. 6-2

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6-2
Fibre Channel Storage Enclosures (FC4100)
About the Fibre Channel Storage Enclosure
Disk Drive Spin-up Sequence
The two APC modules in the Storage Enclosure provide enough
power for 12 disk drives to spin up simultaneously. If one APC
fails, drives 1–3 will spin up first, followed by drives 4–6, drives
7–9 and drives 10–12, with a 6-second delay between each set.
See
Drive Slot Numbers
on page 1-5
for the location of each drive
slot.
I/O Modules
The Adaptec FC Storage Enclosure can accommodate two LIO
modules, although it is possible to have only one. LIO modules are
a combination of an LRC
3
module and a copper or optical module.
The LIO modules are located on the back of the Storage Enclosure,
as shown in
Figure 6-1
.
Figure 6-1
FC I/O Modules
The Input connector is the primary FC Loop Input port, and the
Output connector is available for FC loop expansion output. A
loop-back module is not required, since the I/O expansion module
automatically enables the expansion/output connector when valid
FC signals are present.
The LIO JBOD module is used for FC JBOD applications, and has
two connectors on it, labelled Input and Output.
FC I/O Modules