Adaptec FS4500 User Guide - Page 65

About the Adaptec SC4100 Storage Enclosure, Disk Drive Spin-up Sequence, I/O Modules

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Ultra320 SCSI Storage Enclosures About the Adaptec SC4100 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 7-12 will spin up first, followed by drives 1-6 approximately 15 seconds later. See Drive Slot Numbers on page 1-5 for the location of each drive slot. I/O Modules The Adaptec SC4100 Storage Enclosure has two I/O modules available-the Adaptec JBOD I/O module and the Joiner module. SCSI JBOD I/O Module The Adaptec SC4100 Storage Enclosure supports one SCSI JBOD I/ O module, which can be located in either of the I/O module slots. The SCSI JBOD I/O module provides two very high-density cable interconnect (VHDCI connectors), as shown in Figure 7-1, that are used to connect the enclosure to hosts. Connector LED Connector LED Module Fault LED VHDCI SCSI Connectors Figure 7-1 SCSI JBOD Connectors and LEDs SCSI JBOD I/O Module LEDs The Adaptec SC4100 has three LEDs, shown in Figure 7-1. The two Connector LEDs are green, and illuminate when the connectors are attached to a host system with VHDCI cables. When a Connector LED is blinking, the I/O module is communicating with the ES module. (See page 3-2 for information on the ES module.) 7-2

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7-2
Ultra320 SCSI Storage Enclosures
About the Adaptec SC4100 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 7–12 will spin up first, followed by drives 1–6
approximately 15 seconds later.
See
Drive Slot Numbers
on page 1-5
for the location of each drive
slot.
I/O Modules
The Adaptec SC4100 Storage Enclosure has two I/O modules
available—the Adaptec JBOD I/O module and the Joiner module.
SCSI JBOD I/O Module
The Adaptec SC4100 Storage Enclosure supports one SCSI JBOD I/
O module, which can be located in either of the I/O module slots.
The SCSI JBOD I/O module provides two very high-density cable
interconnect (VHDCI connectors), as shown in
Figure 7-1
, that are
used to connect the enclosure to hosts.
Figure 7-1
SCSI JBOD Connectors and LEDs
SCSI JBOD I/O Module
LEDs
The Adaptec SC4100 has three LEDs, shown in
Figure 7-1
.
The two Connector LEDs are green, and illuminate when the
connectors are attached to a host system with VHDCI cables. When
a Connector LED is blinking, the I/O module is communicating
with the ES module. (See
page 3-2
for information on the ES
module.)
VHDCI SCSI Connectors
Connector LED
Module Fault LED
Connector LED