User manual

LaCie 4big Quadra • Design by Neil Poul ton RAID
User Manual page 15
3. RAID
3.1. About RAID Modes
This section will help you decide which RAID mode is right for
your application.
RAID 03.1.1.
The 4big Quadra is pre-configured in RAID 0, the fastest RAID
mode. Requiring at least 2 drives, RAID 0 stripes data onto each
disk. The available capacities of each disk are added together so
that one logical volume mounts on the computer.
If one physical disk in the array fails, the data of all disks be-
comes inaccessible because parts of the data have been written
to all disks.
A1
B1
C1
D1
A2
B2
C2
D2
A3
B3
C3
D3
A4
B4
C4
D4
RAID 0
Disk 1 Disk 2 Disk 3 Disk 4
RAID Number RAID Mode Capacity Protection Speed
0 RAID 0 100%
1 RAID 10 50%
2 Concatenation 100%
3 RAID 3 75%
4 RAID 3+Spare 50%
5 RAID 5 75%
6 RAID 5+Spare 50%
7 N/A (no RAID changes will take effect if 7 is selected)
Applications
RAID 0 is ideal for users who need maximum speed and
capacity. Video editors working with very large files may
use RAID 0 when editing multiple streams of video for
optimal playback performance. A RAID 0 array is more
suited for actively working with files (editing video, for ex-
ample) and should not be used as a storage backup.