Technical Product Specification

RAID Functionality and Features IntelP®P RAID Controller RS2PI008 Technical Product Specification
4.1.2 RAID Virtual Drive Status
Table 13 RAID Virtual Drive Status
Drive State Code Description
Optimal Optimal The drive operating system is good. All configured drives are online.
Degraded Degraded The drive operating condition is not optimal because one of the configured drives has
failed or is offline.
Offline Offline The drive is not available to the operating system and is unusable.
4.1.3 RAID Controller Drive Limitations
Only drives that comply with the SAS and SATA specification extensions are supported.
4.2 SAS Bus and ID Mapping
Devices on the SAS bus are persistently mapped based on a SAS address.
4.3 RAID Features
4.3.1 RAID Level Support
The supported RAID levels are summarized in the following table:
Table 14 Supported RAID Levels
RAID Level Description
RAID 0 Data is striped to one or more physical drives. If using more than one disk, each stripe is stored on the
drives in a “round robin” fashion. RAID 0 includes no redundancy. If one hard disk fails, all data is lost.
RAID 1 Disk mirroring: All data is stored twice, making each drive the image of the other. Missing data on one
drive can be recovered from data on the other drive. RAID 1 requires two drives for each mirrored
array.
RAID 5 Data striping with distributed parity: Data is striped across the hard disks and the controller calculates
redundancy data (parity information) that is also striped across the hard disks. Missing data is rebuilt
from parity. RAID 5 requires a minimum of three drives in the array but can be expanded to the
capacity of the controller.
RAID 6 Data striping with two distributed parities: Data is striped across all disks in the array and two parity
disks are used to provide protection against the failure of up to two physical disks. In each row of data
blocks, two sets of parity data are stored.
RAID 10 RAID 10 is accomplished by striping data across two or more RAID 1 arrays. Missing data is rebuilt
from redundant data stripes. RAID 10 requires a minimum of four drives. RAID 10 provides high data
throughput rates.
RAID 50 RAID 50 is accomplished by striping data across two or more RAID 5 arrays. Missing data is rebuilt
from redundant data stripes. RAID 50 requires a minimum of six drives. RAID 50 provides high data
throughput rates.
RAID 60 RAID 60 is accomplished by striping data across two or more RAID 6 arrays. Missing data is rebuilt
from redundant data stripes. RAID 60 requires a minimum of eight drives. RAID 60 provides high fault
tolerance.
Revision 1.1
Intel order number E64396-002
20