Tandberg DataGlossary
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RAID 1
RAID 1, also known as disk mirroring, writes data simultaneously to several duplicate drives. If one drive fails, the other drive(s) continues to function as a single drive until the failed drive is replaced.
RAID 5
RAID 5 is also known as striping with parity at byte level. In RAID 5, both data and parity information are written to all of the drives in the subsystem. If one drive in the system fails, the parity information can be used to reconstruct the data from that drive. All drives in the array system can be used for a seek operation at the same time, thereby increasing the performance of the RAID system.
RAID 6
RAID 6 provides the highest reliability, but is not yet widely used. It is similar to RAID 5, but it performs two different parity computations or the same computation on overlapping subsets of data. RAID 6 can offer fault tolerance greater than RAID 1 or RAID 5 but consumes the capacity of 2 disk drives for distributed parity data. RAID 6 is an extension of RAID 5 but uses a second, independent distributed parity scheme. Data is striped on a block level across a set of drives, and then a second set of parity is calculated and written across all of the drives.
RAID 10
RAID 10 is a combination of RAID 0 and RAID 1, striping and disk mirroring. RAID Level 10 combines the fast performance of Level 0 with the data redundancy of Level 1. In this configuration, data is distributed across several drives, similar to Level 0. Then the data are duplicated to another set of drives for data protection. RAID 10 provides the highest read/write performance of any of the hybrid RAID levels.
RAID 0+1
RAID 0+1 is a mirrored array whose segments are RAID 0 arrays. It has the same fault tolerance as RAID 5, and the same overhead for fault tolerance as mirroring alone. This RAID has excellent performance, but not maximum reliability.
Rack mount
Ordinarily, a
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