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SE7500CW2 Server Board Technical Product Specification
4.
Included PCI Devices
4.1
ATA-100 RAID
®
The Intel
Server Board SE7500CW2 provides an embedded dual channel ATA-100 bus through
the use of the Promise* Technology PDC20267 ASIC. The PDC20267 ATA-100 controller
contains two independent ATA-100 channels that share a single 32-bit, 33-MHz PCI bus master
interface as a multifunction device, packaged in a 128-pin PQFP.
The ATA-100 controller supports the following features:
The scatter / gather mechanism supports both DMA and PIO IDE drives and ATAPI devices
Support for 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
The IDE drive transfer rate is capable of up to 100 MB/sec per channel
The host interface complies with PCI Local Bus Specification, Revision 2.2
•
32-bit, 33-MHz bus speed and 132 MB/sec sustained transfer rate
The Promise PDC20267 supports IDE RAID through dual 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 upwards of two, three, or four drives.
The IDE RAID can be configured as followings:
RAID Level
RAID 0 (Striping)
RAID 1 (Mirroring)
RAID 0+1 (Stripe/Mirror)
JBOD (Spanning)
17
Revision 1.40
Table 4. ATA-100 RAID Level
Performance
Capacity
Highest
# Drives x Smallest Size
Normal
50% min
High
50% min
Normal
100% of All Drives
Included PCI Devices
# of Drives
2 to 4
2
4
2 to 4
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