3. Understanding RAID
page 16
LaCie Biggest S1S
User’s Manual
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 number of disks, so in the case of the
LaCie Biggest S1S, you would need to have four hard disks installed.
Characteristics & 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 performance,
without achieving maximum reliability
Recommended Uses
• Imaging Applications
• General Fileserver
E
D
C
B
A
CONTROLLER
A
B
C
D
E
F
G
H
R0
R0
A
B
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D
E
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R1
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.
