LaCie 2big
User Manual
3.1.4. SAFE 100 (RAID 1)
■
In Safe 100 mode, the two physical disks are
mirrored together (RAID 1) so that one single logical
volume mounts on the desktop.
All of the data (100%) are saved simultaneously
on each disk (the available capacity cannot exceed the
available capacity of the lowest-capacity single disk).
ImpOrTANT INfO:
data are available immediately on the second disk. No
data are lost if one disk fails.
Characteristics and Advantages
Maximum data safety
❖
Safe 100 reduces the total available capacity by
❖
50% because two copies of the data are saved.
3.1.5. SAFE 50
■
disk 1
disk 2
In Safe 50 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 50% of the available capacity of each disk (the
available capacity cannot exceed 50% of the lowest-
capacity single disk).
ImpOrTANT INfO:
data of the SAFE volume are available on the second
disk. Only 25% of data (the data on the SAFE volume)
are saved if a disk fails.
disk 1
disk 2
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
50% of the available capacity of each disk.
If one physical disk fails, the
disk 1
disk 1
disk 1
disk 2
If one physical disk fails, the
disk 1
One Safe volume
disk 2
Fig. 3.1.4
disk 2
One Big volume
One Safe volume
disk 2
Fig. 3.1.5
Characteristics and Advantages
Provides two volumes for different data security
❖
needs.
Only 75% of total capacity is available due to
❖
mirroring on the Safe volume.
RAID
page 22
disk 1
disk 2
disk 1
disk 2
disk 1
disk 2
disk 1
disk 2