RAID-0 Block Interleave Data Striping w/o Parity

^{IBM-AUSTRIA - PC-HW-Support 30 Aug 1999}

RAID-0 Block Interleave Data Striping w/o Parity

RAID-0 Block Interleave Data Striping w/o Parity

Striping of data across multiple disk drives without parity protection is a disk data organization technique sometimes employed to maximize DASD subsystems performance (for example, Novell NetWare's data scatter option).

An additional benefit of this organization is that of drive spanning . with data striped across multiple drives in an array, the logical drive size may be limited by the operating system.

RAID-0 (Block Interleave Data Striping w/o Parity) +----------+ | Disk | |Controller| +----+-----+ +---------+---------+---------+---------+ | | | | | +--+--+ +--+--+ +--+--+ +--+--+ +--+--+ |XXXXX| |XXXXX| |XXXXX| |XXXXX| |XXXXX| Block 0 |-----| |-----| |-----| |-----| |-----| |yyyyy| |zzzzz| | | | | | | |-----| |-----| |-----| |-----| |-----| | | | | | | | | | | Block n +-----+ +-----+ +-----+ +-----+ +-----+ Disk 1 Disk 2 Disk 3 Disk 4 Disk 5 xxxxx = Block belonging to a long file yyyyy and zzzzz = Blocks belonging to short files

Data striping improves the performance with large files since reads/writes are overlapped across all disks. However, reliability is decreased as the failure of one disk will result in a complete failure of the disk subsystem according to the formula:

Mean Time to Failure of a single Disk Mean Time to Failure = --------------------------------------- Number of Disks in the array

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