It is found in Industrial, Manufacturing and Communications systems where performance and minimum downtime are critical. PSI specializes in support for OEMs and VARs needing cost effective, high performance fault tolerant systems. As drives are added, the chance of a drive failure increases. Using parity, missing data can be reconstructed from the remaining data. Either may be referred to as a span, array or logical drive.
Parity adds significant overhead.
There is a severe performance penalty when operating with a failed drive. This eliminates the overhead and delay of parity.