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Introduction
RAID - Redundant Array of Independent Disks
RAID technology manages multiple disk drives to enhance I/O performance and pro-
vide redundancy in order to withstand the failure of any individual member, without
loss of data. RAID provides two RAID Set types, Striping (RAID 0) and Mirroring (RAID
1).
RAID 0 (Striping)
Striping is a performance-oriented, non-redundant data mapping technique. W hile
Striping is discussed as a RAID Set type, it actually does not provide fault tolerance.
Striping arrays use multiple disks to form a larger virtual disk.
RAID 1 (Mirroring)
Disk mirroring creates an identical twin for a selected disk by having the data simul-
taneously written to two disks. This redundancy provides instantaneous protection
from a single disk failure. If a read failure occurs on one drive, the system reads the
data from the other drive.
JBOD (Concatenate)
JBOD provides a method for combining drives of different sizes into one large disk
