Ultra Start 450 SERIES Instruction Manual download pdf (Page 363)

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Chapter 6 Administration and Networking 343

RAID 0: Disk Striping

Disk striping (sometimes called RAID-0) is a technique for increasing system

throughput by using several disk drives in parallel. Whereas in non-striped disks the

operating system writes a single block to a single disk, in a striped arrangement each

block is divided and portions of the data are written to different disks.

System performance using RAID 0 will be better than using RAID 1 or 5, but the

possibility of data loss is greater because there is no way to retrieve or reconstruct

data stored on a failed drive.

RAID 5: Disk Striping with Parity

RAID Level 5 is an implementation of disk striping in which parity information is

included with each disk write. The advantage of the technique is that if any one disk

in a RAID-5 array fails, all the information on the failed drive can be reconstructed

from the data and parity on the remaining disks.

System performance using RAID 5 will fall between that of RAID 0 and RAID 1, and

all data loss is fully protected.

Hot Spares

In a hot spares arrangement, one or more disk drives are installed in the system but

are unused during normal operation. Should one of the active drives fail, disk write

operations are automatically redirected to a hot spare disk and the failed disk drive

is retired from operation.

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