LaCie FIREWIRE 800/400 - Manual (Page 18)

LaCie Biggest Quadra
User Manual page
Understanding RAID
3.2. RAID 0 + 1
High Data Transfer Performance
This level combines striping and mirroring, which
provides full data redundancy and protects data in the
event that multiple drives fail (provided that the data on
one of each mirrored pair of drives is intact).
Storage capacity in this configuration is determined
by multiplying the capacity of the smallest disk by two.
If, for instance, there were four drives installed that
ranged in capacity from 40GB to 70GB, as a RAID 0+1
array, the total available capacity would be 80GB (40GB
x 2). In this configuration, you must have an even num-
ber of disks, so in the case of the LaCie Biggest Quadra,
you would need to have four hard disks installed.
Characteristics and Advantages ■
Implemented as a mirrored array with RAID 0
arrays as the segments
The same fault tolerance as RAID level 5
Fault-tolerance overhead is the same as that of
mirroring
High I/O rates are achieved thanks to multiple
striped segments
Excellent design for those seeking high perfor-
mance, without achieving maximum reliability
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This diagram represents a
RAID 0 +1 array, consisting of
four disks, which are
connected to the Controller.
The Controller creates two
matching RAID 0 arrays on
the four disks.
E
D
C
B
A
CONTROLLER
A
C
E
G
B
D
F
H
R0 R0
A
C
E
G
B
D
F
H
R1
Recommended Uses ■
Imaging Applications
General Fileserver
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Fig. 3.2.