LaCie 2big Quadra
•
DESIGN BY NEIL POULTON
RAID
User Manual
page 17
3.1.3. Safe (RAID 1)
In Safe mode (RAID 1), the two physical disks are mirrored
together so that one single logical volume mounts on the
desktop.
All data is saved simultaneously on each disk (the available
capacity cannot exceed the available capacity of the lowest-
capacity single disk). If one physical disk fails, the data is
available immediately on the second disk. No data is lost if one
disk fails.
Applications
✦
Maximum data safety
✦
Safe reduces the total available capacity by 50% be-
cause two copies of the data are saved.
Disk 1
Disk 2
A1
B1
C1
D1
E1
A1
B1
C1
D1
E1
Disk 1
Disk 2
D1
E1
F1
D2
E2
F2
A1
B1
C1
A1
B1
C1
Volume 1
RAID 1
Volume 2
RAID 0
3.1.4. Mixed (RAID 1 and RAID 0)
In Mixed mode, the two physical disks are combined so that two
logical volumes mount simultaneously on the desktop:
✦
One Safe volume (RAID 1) where data is automatically mir-
rored on each physical disk. This volume uses 50% of the
available capacity of each disk (the available capacity can-
not exceed 50% of the lowest-capacity single disk).
IMPORTANT INFO:
If one physical disk fails, the data of the
SAFE volume is available on the second disk. Only 25% of full
capacity is protected by mirroring. In this case, data on the Fast
(RAID 0) volume will be lost.
✦
One Fast volume (RAID 0) enables the user to work with the
high speed of RAID 0.
Applications
✦
Provides two volumes for different data security needs.
✦
Only 75% of total formatted capacity is available due
to mirroring on the Safe volume.
