RAID 5 - Block interleaved distributed parity

RAID 5 is the most common type of RAID.
By distributing parity across some or all of an array's member disk drives, RAID level 5 eliminates the write bottleneck inherent in level 4. The only performance bottleneck is the parity calculation process.
With modern CPUs and Software RAID, that usually is not a very big problem. As with level 4, the result is asymmetrical performance, with reads substantially outperforming writes.

Fault tolerance is maintained by ensuring that the parity information for any given block of data is placed on a drive separate from those used to store the data itself.

The performance of a RAID 5 array can be "adjusted" by trying different stripe sizes until one is found that is well-matched to the application being used.

See other RAID arrays below:

RAID 0 - Striped disk array
RAID 1 - Mirroring and duplexing
RAID 5 - Block interleaved distributed parity
RAID 6 - Independent data disks with double parity
RAID 10 - High reliability combined with high data performance


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