RAID parity


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Related to RAID parity: RAID 4

RAID parity

Parity computations are used in RAID drive arrays for fault tolerance by calculating the data in two drives and storing the results on a third. The parity is computed by XOR'ing a bit from drive 1 with a bit from drive 2 and storing the result on drive 3 (to learn about XOR, see OR). After a failed drive is replaced, the RAID controller rebuilds the lost data from the other two drives. RAID systems often have a "hot" spare drive ready and waiting to replace a drive that fails. See RAID.
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AMI's Advanced ASIC generates RAID parity, freeing up Intel's i960RD(TM) RISC Processor, for additional processing.
The RAID controller is no longer the bottleneck during RAID parity operations.
The SYM53C1510 includes a number of advanced features such as a customized ARM7 RISC processor with on-chip instruction cache; RAID parity generation and checking hardware; 32 bit, 33 MHz PCI interface; support for intelligent RAID messaging; high speed memory controller that supplies up to 160 MB/s of I/O bandwidth and two Ultra2 LVD SCSI cores.