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.
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
, 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
.
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
for information on the ES
module.)
VHDCI SCSI Connectors
Connector LED
Module Fault LED
Connector LED
