Intel D945PLRN D945PLRN Technical Product Specification - Page 22

Serial ATA RAID Optional, 5.2.4, SCSI Hard Drive Activity LED Connector Optional

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Intel Desktop Board D945PLRN Technical Product Specification NOTE Many Serial ATA drives use new low-voltage power connectors and require adaptors or power supplies equipped with low-voltage power connectors. For more information, see: http://www.serialata.org/ For information about The location of the Serial ATA IDE connectors Refer to Figure 13, page 48 1.5.2.3 Serial ATA RAID (Optional) The optional ICH7-R supports the following RAID (Redundant Array of Independent Drives) levels: • RAID 0 - data striping. Multiple physical drives can be teamed together to create one logical drive. As data is written or retrieved from the logical drive, both drives operate in parallel, thus increasing the throughput. The ICH7-R allows for more than two drives to be used in a RAID 0 configuration. • RAID 1 - data mirroring. Multiple physical drives maintain duplicate sets of all data on separate disk drives. Level 1 provides the highest data reliability because two complete copies of all information are maintained. The ICH7-R allows for two or four drives to be used in a RAID 1 configuration. • RAID 0+1 (or RAID 10) - data striping and mirroring. RAID 0+1 combines multiple mirrored drives (RAID 1) with data striping (RAID 0) into a single array. This provides the highest performance with data protection. Data is striped across all mirrored sets. RAID 0+1 utilizes several drives to stripe data (increased performance) and then makes a copy of the striped drives to provide redundancy. The mirrored disks eliminate the overhead and delay of parity. • RAID 5 - distributed parity. RAID Level 5 stripes data at a block level across several drives and distributes parity among the drives; no single disk is devoted to parity. Because parity data is distributed on each drive, read performance tends to be lower than other RAID types. RAID 5 requires the use of three or four drives. 1.5.2.4 SCSI Hard Drive Activity LED Connector (Optional) The SCSI hard drive activity LED connector is a 1 x 2-pin connector that allows an add-in hard drive controller to use the same LED as the onboard IDE controller. For proper operation, this connector should be wired to the LED output of the add-in hard drive controller. The LED indicates when data is being read from, or written to, either the add-in hard drive controller or the onboard IDE controller (Parallel ATA or Serial ATA). For information about The location of the SCSI hard drive activity LED connector The signal names of the SCSI hard drive activity LED connector Refer to Figure 13, page 48 Table 19, page 50 22

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Intel Desktop Board D945PLRN Technical Product Specification
22
±
NOTE
Many Serial ATA drives use new low-voltage power connectors and require adaptors or power
supplies equipped with low-voltage power connectors.
For more information, see:
For information about
Refer to
The location of the Serial ATA IDE connectors
Figure 13, page 48
1.5.2.3
Serial ATA RAID (Optional)
The optional ICH7-R supports the following RAID (Redundant Array of Independent Drives)
levels:
•
RAID 0
- data striping.
Multiple physical drives can be teamed together to create one logical
drive.
As data is written or retrieved from the logical drive, both drives operate in parallel, thus
increasing the throughput.
The ICH7-R allows for more than two drives to be used in a
RAID 0 configuration.
•
RAID 1
- data mirroring.
Multiple physical drives maintain duplicate sets of all data on
separate disk drives.
Level 1 provides the highest data reliability because two complete copies
of all information are maintained.
The ICH7-R allows for two or four drives to be used in a
RAID 1 configuration.
•
RAID 0+1 (or RAID 10)
- data striping and mirroring.
RAID 0+1 combines multiple mirrored
drives (RAID 1) with data striping (RAID 0) into a single array.
This provides the highest
performance with data protection.
Data is striped across all mirrored sets.
RAID 0+1 utilizes
several drives to stripe data (increased performance) and then makes a copy of the striped
drives to provide redundancy.
The mirrored disks eliminate the overhead and delay of parity.
•
RAID 5
- distributed parity.
RAID Level 5 stripes data at a block level across several drives
and distributes parity among the drives; no single disk is devoted to parity.
Because parity data
is distributed on each drive, read performance tends to be lower than other RAID types.
RAID 5 requires the use of three or four drives.
1.5.2.4
SCSI Hard Drive Activity LED Connector (Optional)
The SCSI hard drive activity LED connector is a 1
x
2-pin connector that allows an add-in
hard drive controller to use the same LED as the onboard IDE controller.
For proper operation, this
connector should be wired to the LED output of the add-in hard drive controller.
The LED
indicates when data is being read from, or written to, either the add-in hard drive controller or the
onboard IDE controller (Parallel ATA or Serial ATA).
For information about
Refer to
The location of the SCSI hard drive activity LED connector
Figure 13, page 48
The signal names of the SCSI hard drive activity LED connector
Table 19, page 50