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Intel® Integrated RAID Module SROMBSASMR (AXXROMBSASMR) Technical Product Specification RAID Functionality and Features
4.1.2 RAID Virtual Drive Status
Table 11. 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
Table 12. 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 a minimum of two drives in the
array.
RAID 5 Data striping with 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.
RAID 6 Data striping with distributed parity across two disks: 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 up to eight 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 up to five 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 up to five 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 1.2
Intel order number E59029-003
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