Intel MB440LX manual Configuration Options, 139

SCSI Hot-docking Backplane

The hot-docking backplane provides the following:

∙Five SCA connectors for SCA-compatible SCSI drives

∙Power control for each drive, including automatic slot-power-down upon removing a drive

∙Signal for a fault indicator on the front panel for each drive

∙Internal I2C bus

∙+12 V connector for a fan with tachometer

∙Local I2C-based temperature sensor

The SCSI hot-docking backplane provides control signals and power for five wide/fast 3.5-inch SCA SCSI hard disk drives. The backplane receives control signals from the Symbios SCSI controller on the system board through a cable connected to the wide SCSI connector on the backplane. The backplane gets power from the power system through cables connected to the two power connectors.

The drives get their control signals and power from the SCA connectors on the backplane.

The fault indicators on the front panel indicate failure status for each drive in the bay. These indicators get their signals through a cable connected to the front panel connector on the backplane.

The temperature sensor on the backplane provides temperature information to other devices in the system through enclosure service messages.

The backplane power control provides powering down of a drive when a failure is detected and reported to the SCSI bus. When a new drive is inserted, the power control waits a short time for the drive to become fully seated and then applies power to the drive.

Configuration Options

The hot-docking backplane contains only one configuration jumper: J8, the internal/external jumper.

Ajumper is a small plastic-encased conductor—shorting plug—that slips over two jumper pins.

M440FX Server System Product Guide 139