LaCie 5big Network 2
• DESIGN BY NEIL POULTON
Administering Your LaCie 5big Network 2
User Manual
page 55
RAID10:
RAID 10 (also called RAID 1+0) is another RAID level that
combines the attributes of other levels, specifically RAID 1 and RAID
0. It is a “stripe of mirrored sets”, meaning that data is striped across
two mirrored arrays (
Fig. 81
). The Striping occurs between arrays
and the mirroring occurs within the same array, which makes the
rebuilding very fast. This RAID mode is therefore only available if the
5big Network 2 has four disks installed.
RAID0:
RAID 0 (also called Spanning mode in some LaCie devices),
is the fastest RAID mode. In a RAID 0 array, the available capacities
of each disk are added together so that one logical volume mounts
on the computer (
Fig. 82
). It offers the best performance but no
protection in the case that a disk fails.
CAUTION:
In a RAID0 array, if one physical disk in the array fails,
the data of all disks becomes inaccessible because parts of the data
have been written to all disks.
RAID1:
RAID 1 is a secure RAID mode that is available if the 5big
Network 2 has only two disks installed. RAID 1 provides data safety
since all data is written to each disk at the same time (
Fig. 83
). In the
event of a single disk failure, data remains available on the other
disk. Due to the time it takes to write the data twice, performance
is slightly reduced. RAID 1 is a good choice when safety is more
important than speed. However RAID 1 also reduces the available
disk space by 50% due to the need to write each bit of data on each
hard drive.
Fig. 81
RAID 1
RAID 1
RAID 0
A2
A4
A6
A8
RAID 10
A2
A6
A8
A4
A1
A3
A7
A5
A1
A3
A5
A7
Disk 1
Disk 2
Disk 3
Disk 4
RAID 1
A1
B1
C1
D1
E1
A1
B1
C1
D1
E1
Disk 1
Disk 2
Fig. 82
Fig. 83
K:B=)
Disk 1
Disk 2
Disk 3
Disk 4
Disk 5
A1
B1
C1
D1
A2
B2
C2
D2
A3
B3
C3
D3
A4
B4
C4
D4
A5
B5
C5
D5
E1
E2
E3
E4
E5
