Description 11
Video
The SCB2 uses an ATI RAGE XL PCI graphics accelerator with 8 MB of video SDRAM that
supports all standard IBM
†
VGA modes. The embedded SVGA video subsystem supports:
• Pixel resolutions up to 1600 x 1200 under 2D and 1024 x 768 under 3D
• CRT and LCD monitors up to 100 Hz vertical refresh rate
The server board supports disabling of the onboard video through the BIOS setup menu or when a
plug in video card is installed in any of the PCI slots.
SCSI Controller
The SCSI version of the server board includes an embedded Adaptec
†
AIC-7899W controller
providing dual Ultra160 Low Voltage Differential (LVD) SCSI channels.
The SCSI bus is terminated on the server board with active terminators that cannot be disabled.
The onboard device must always be at one end of the bus. The device at the other end of the cable
must also be terminated. LVD devices generally do not have termination built-in and need to have
a termination source provided. Non-LVDs devices generally are terminated through a jumper or
resistor pack on the device itself.
ATA-100 Controller
The ATA version of the server board provides an embedded dual channel ATA-100 bus through the
use of the Promise Technology
†
PDC20267 ATA-100 controller. The controller contains two
independent ATA-100 channels that share a single 32-bit, 33-MHz PCI bus master interface as a
multifunction device. The controller supports:
• DMA and PIO IDE drives and ATAPI devices
• ATA and ATAPI proposal PIO Mode 0, 1, 2, 3, 4; DMA Mode 0, 1, 2; and
Ultra DMA Mode 0, 1, 2, 3, 4, 5
• IDE transfer rates up to 100 MB/sec per channel
• Buffering for PCI/IDE burst transfers
• Master/slave IDE mode
• Host interface complies with PCI Local Bus Specification Revision 2.2
IDE RAID
The ATA-100 controller supports IDE RAID through both ATA-100 channels. In a RAID
configuration, multiple IDE hard drives are placed into one or more arrays of disks. Each array is
seen as an independent disk, though the array may include one, two, three, or four drives. The IDE
RAID can be configured as follows:
• RAID 0: Striping one to four drives
• RAID 1: Mirroring two drives
• RAID 1 +: Spare drive (three drives)
• RAID 0 +: One to four drives are required
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