Distributed Data Guarding, Raid 5 - Compaq N2400 - TaskSmart - 1 GB RAM Administration Manual

B-2 Compaq TaskSmart N2400 Administration Guide
Distributed data guarding requires an array with a minimum of three physical
drives. In an array containing three physical drives, distributed data guarding
uses only 33 percent of the total logical drive storage capacity for fault
tolerance; a 14-drive configuration uses only seven percent.
NOTE: Given the reliability of a particular generation of hard drive technology, the
probability of an array experiencing a drive failure increases with the number of drives in
an array. Compaq recommends the number of drives in an array be limited to 14.
DATA DATA
P
P
Figure B-1. Distributed data guarding, RAID 5, distributes redundant data
(Parity) throughout physical drives
DATA
P
P
P
P
DATA
P
P
P
P = Parity