RAID Technology Overview - September 2007

Index
A
ADGSee RAID ADG, 17
advanced data guarding (RAID ADG), 17
array
defined, 12
physical limitations of, 14
B
block of data, defined, 13
C
comparison
of different RAID methods, 19
D
data block, defined, 13
data protection methods
RAID, 14
data stripes, defined, 13
distributed data guarding (RAID 5), 17
drive arraySee array, 12
drive mirroring (RAID 1+0), 15
F
fault tolerance
description of methods, 14
fault toleranceSee also RAID methods, 14
features
of RAID methods, 19
H
hard drive failure
fault tolerance and, 19
multiple, simultaneous, 19
protection against, 14
hard drives
minimum number of, for RAID, 19
hot spare
defined, 14
L
load balancing, defined, 16
logical drives
compared to array, 12
M
maximum number of
hard drives for RAID 5, 19
hard drives for RAID ADG, 19
minimum
number of hard drives for RAID, 19
mirroring of drives, 15
multiple hard drive failure, 19
N
no fault tolerance (RAID 0), 15
O
online spare
defined, 14
limitations of, 14
P
parity data
in RAID 5, 17
in RAID ADG, 17
physical drivesSee hard drives, 14
protecting data
RAID methods, 14
R
RAID 0 (no fault tolerance), 15
RAID 1+0 (drive mirroring), 15
RAID 5 (distributed data guarding), 17
RAID ADG (advanced data guarding), 17
RAID methods
comparison with each other, 19
selection chart for, 19
summary of features, 19
RAID methodsSee also fault tolerance, 14
S
spare drives
defined, 14
striping data, defined, 13
summary
of RAID methods, 19
25