Compaq ProLiant ML350 G2 Service Overview
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supplies send power to the power supply backplane. If one power supply fails, the other will
continue to keep the server operational.
Ultra 3 Hot-Plug (HP) Drive Cages
The ProLiant ML350 G2 supports six Low Voltage Differential SCSI (LVDS) Wide Ultra3 SCSI
hot-pluggable (HP) hard drives. Each 1-inch bay can hold a 72.8GB 10,000-rpm hard drive
(436.8GB total). These drives operate on one channel of the integrated SCSI controller. The
second channel can operate either an external secondary storage system or an internal or external
tape backup device.
Non-Hot Plug (HP) Media Bays
Two optional non-HP drives can be mounted in the removable media bays to increase the total
internal storage capacity to 509.6GB.
Internal Two Bay Hot Plug (HP) Wide Ultra2/Ultra3 SCSI Drive Cage Option
Alternatively, a 2-bay SCSI drive cage with one 1” and one 1.6” drive bay, installed in two
available removable media bays is available as an option. This cage supports two HP 72.8GB
drives that can increase the internal storage capacity to 582.4GB.
Enhanced Fan Control
A temperature-sensing device located near the processors now monitors the temperatures of both
processors and the ambient temperature of the chassis. When any of these three temperatures
reaches a predefined limit, the fan speed increases to control the temperature in the system.
Server Feature Bus
The Server Feature Bus is a proprietary bus that has PCI and management signals. Running the
management signals through this bus eliminates the need for the System Management Interface
Cable (SMIC) that was compulsory in the first generation of the ProLiant ML350.
Server Feature Board
The server feature bus slot, located at the bottom of the system board, houses the Server Feature
Board. This board contains the hard drive, NIC, video, and management controllers.
Drive and network activity is passed over the server feature bus to the LEDs on the front of the
chassis. This eliminates the need for a System Management Interface Cable (SMIC) on the board
and simplifies removal and replacement procedures.
NMI Debug Button
The NMI Debug button is located on the Server Feature Board. NMI is a diagnostic mechanism
that allows for crash dump files to be created in situations when a system is hung and unable to
respond to traditional debug mechanisms. The NMI Debug button can be used to diagnose
software failures by forcing the operating system to invoke the Non-Maskable Interrupt (NMI)
handler and generate a crash dump log. This log can provide critical troubleshooting information
that may be difficult or impossible to obtain through other means.
