LaCie 2big User Manual page 50

LaCie 2big
User Manual
6.6. Safe 33
In Safe 33 mode, the two physical disks are combined
so that two logical volumes mount simultaneously on
the desktop:
One Safe volume (RAID 1) where data are automat-
❖
ically mirrored on each physical disk. This volume
uses 33% of the available capacity of each disk (the
available capacity cannot exceed 33% of the lowest-
capacity single disk). If one physical disk fails, the
data of the Safe volume are available on the second
disk.
One Big volume (concatenation) for less critical data
❖
which do not need to be mirrored on each physical
disk. The available capacity of the Big volume uses
66% of the available capacity of each disk.
disk 1 disk 2
disk 1 disk 2
Understanding RAID
One Big volume
One Safe volume
disk 1
Fig. 6.6
Characteristics and Advantages
Provides two volumes for different data security
❖
needs.
Approximately 83% of total capacity is available
❖
due to mirroring on the Safe volume.
disk 1
page 
disk 2
disk 2