RAID 0


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Related to RAID 0: RAID 10

RAID 0

(Redundant Array of Independent Disks Mode 0) A popular disk or solid state drive (SSD) subsystem that increases performance by interleaving data across two or more drives. Data are broken into blocks, called "stripes," and alternately written to two or more drives simultaneously to increase speed. For example, stripe 1 is written to drive 1 at the same time stripe 2 is written to drive 2. Then stripes 3 and 4 are written to drives 1 and 2 simultaneously and so on. When reading, stripes 1 and 2 are read simultaneously; then stripes 3 and 4 and so on.

Ironically, RAID 0 is a misnomer because there is nothing "redundant." If one drive fails, the entire RAID array fails. See disk striping, RAID 3, RAID 5 and RAID.


Striping for Performance
Widely used for gaming, striping interleaves data across multiple drives for performance. However, there are no safeguards against failure.







RAID 0 Probability of Failure
The more drives in a RAID 0 array, the higher the probability of array failure. For example, if experience tells us that one out of a thousand drives fails in a year, the probability that a 2-drive array will fail in a year is 1 in 500; that a 3-drive array will fail is 1 in 333 and so on.

The formula: if the probability of failure of each of n drives is p for a given period, then the probability of not failing is (1-p). The probability of all drives functioning is (1-p)^n, and the probability that at least one drive will fail, causing the array to fail, is [1-(1-p)^n].
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References in periodicals archive ?
Fujitsu Siemens Computers' new line of modular RAID PRIMERGY rack and tower servers reportedly enable customers to select host CPU-based RAID 0, 1, 10 and 5 for SATA hard disk drives (HDDs); LSISAS1068E-based integrated RAID 0, 1 and 1E for SAS and SATA HDDs; or LSI SAS1078 ROC-based RAID 0, 1, 10, 5 and 6 for SAS and SATA HDDs.
So if you have two 250GB hard disks in RAID 0 configuration, they will appear as a single 500GB drive to the operating system.
Volumes can be created to support RAID 1 for maximum redundancy, RAID 3 for large sequential data files, RAID 5 for high performance transaction processing of smaller files and RAID 0 for non- redundant workspace.
MegaRAID ATA 133-2 RAID enhances performance for data striping (RAID 0), data redundancy (RAID 1), and mirroring with striping (RAID 10).
The combination of a VIA VT8237-enabled motherboard and two DiamondMax Plus 9, 250GB SATA drives in a RAID 0, gives gamers, graphic artists and video enthusiasts one half of a terabyte (TB) of storage in a single PC system.