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The Intel® Server Board S875WP1-E (product order code S875WP1LX) provides additional four port Serial
ATA through the use of the Promise* Technology PDC20319 controller. The PDC20319 SATA-150 controller
contains four independent Serial ATA channels that share a single 32-bit, 33-MHz PCI bus master
interface as a multifunction device, packaged in a 144-pin LQFP.
The PDC20319 controller supports the following features:
- Burst bus mastering and advanced packet command based scatter/gather engine to enhance overall system performance
- Built in 4 channels Serial ATA PHY, which meets the Serial ATA 1.0 specification and can transfer data with 1.5GHz speed
- Capable of supporting multiple arrays and quad master mode for dedicated Serial ATA channel, up to four physical drives can operate at master mode.
- Quad independent data paths with read ahead and write posting supported for quad IDE channels to have high performance
- PCI interface that complies with PCI Local Bus Specification Revision 2.3 and PCI power management 1.1
- Support 48-bit LBA format for drives larger than 128GB
- 32-bit, 33-MHz bus speed and 150 MB/sec sustained transfer rate.
The PDC20319 supports Serial ATA RAID through four Serial ATA Channels. The RAID Engine supports advance chained packet
commands for XOR and four independent ATA operations improving performance for all RAID levels. In a RAID configuration,
multiple Serial ATA 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 SATA RAID can be configured as follows:
- RAID 0: Striping one to four drives.
- RAID 1: Mirroring two drives.
- RAID 10: Striping and mirroring of data concurrently (requires 4 drives)
RAID 0 configurations are used for high-performance applications, as it doubles the sustained transfer rate of its drives.
RAID 1 configurations are primarily used for data protection. It creates an identical drive backup to a secondary drive.
Whenever a disk write is performed, the controller sends data simultaneously to a second drive located on a different data
channel. With four drives attached to four SATA channels, one pair of striped drives can mirror themselves to another
pair (RAID 10) for storage capacity and data redundancy. For more RAID information,
review the RAID Primer.
This applies to:
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