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4 Megaplex II Chassis Guide
Specifications, Continued
SCSI Drives The 9U chassis supports eight hot plug 3.5” 16-bit single-ended SCA LVD SCSI
drives.
• These drives are accessible from the front.
• Each drive bay can take a full height SCSI LVD drive.
• The eight drives are arranged on two separate back planes. Each back plane
supports four drives. The default IDs of these drives are 0, 1, 2, and 4.
• Access to the back planes is through two Wide SCSI cables. These cables
can be connected, for example, to two channels on a RAID controller.
Cooling There are three fans mounted in the front of the chassis. These fans are hot plug
and are monitored by the Megaplex II system BIOS Health screen and the
management software shipped with Megaplex II.
• There are three blower fans in the power supply assemblies and one
additional rear fan.
• For cooling the CPU area, the CPU top plate must be installed and the Top
Chassis cover must be closed.
Chassis Intrusion There is a chassis intrusion switch that detects when the top system cover is
open. This switch is monitored through the management software provided with
Megaplex II.
Chassis Alarm Indication There are some LEDs and alarms that are displayed on the chassis:
Each of the three power supplies has an alarm. When one of the power supply
fails, the RED LED for that power supply comes on and the buzzer goes off.
Each of the three front mounted fans has an alarm. When one of the fans fail, the
RED LED for that fan comes on and the buzzer goes off.
There is an alarm for the rear-mounted blower. When this fails, the RED LED
for this blower comes on and the buzzer goes off.
Note: There is an Alarm Mute switch that will turn off the buzzer. While the buzzer is
muted, the RED LED for the Alarm Mute is on.
Cont’d