About Raid Modes - LaCie 301424U - 10 TB 5big Network Hard Drive User Manual

LaCie 5big Network 2
User Manual

4.17.2. About RAID Modes

Refer to the table below for an overview of the different RAID modes,
and see the descriptions for details.
RAID Mode Capacity
RAID 5 (default)
RAID 5+Spare
RAID 6
RAID 10*
RAID 0
RAID 1**
RAID5: In RAID 5, data is striped across all disks (minimum of three)
and a parity block for each data block (P in
same stripe. If one physical disk fails, the data from the failed disk
can be rebuilt onto a replacement disk. No data is lost in the case
of a single disk failure, but if a second disk fails before data can be
rebuilt to a replacement drive, all data in the array will be lost.
RAID5+Spare: RAID 5+Spare is a RAID 5 array in which one disk is
used as spare to rebuild the system as soon as a disk fails
At least four disks are required. If one physical disk fails, the data
remains available because it is read from the parity blocks. Data
from a failed disk is rebuilt onto the hot spare disk. When a failed
disk is replaced, the replacement becomes the new hot spare. No
data is lost in the case of a single disk failure, but if a second disk
fails before the system can rebuild data to the hot spare, all data in
the array will be lost.
RAID6: In RAID 6, data is striped across all disks (minimum of four)
and a two parity blocks for each data block (p and q in
written on the same stripe. If one physical disk fails, the data from
the failed disk can be rebuilt onto a replacement disk. This Raid
mode can support up to two disk failures with no data loss. RAID 6
provides for faster rebuilding of data from a failed disk.
continued on the next page >>
* RAID 10 is only available if there are four disks installed in the 5big Net-
work 2.
** RAID 1 is only available if there are two disks installed in the 5big Network
2.
• DESIGN BY NEIL POULTON
Protection
80%
60%
60%
50%
100%
50%
Fig. 78) is written on the
(Fig.
Fig.
Administering Your LaCie 5big Network 2
A1
B1
C1
D1
Ep
Disk 1
Fig. 78
A1
B1
C1
79).
DP
Disk 1
Fig. 79
80) is
A1
B1
C1
Dp
Disk 1
Fig. 80
RAID 5
A2 A2 A3 A3 A4
B2 B2 B3 Bp Bp B3
C2 Cp Cp C2 C3 C3
Dp D1 D2 D2 D3 D3
E1 E2 E3
Disk 2 Disk 3 Disk 4
RAID 5+Spare
A2 A3 A3 Ap
B2 Bp B3
Cp C2 C3
D1 D2 D2 D3
Disk 2 Disk 3 Disk 4
RAID 6
A2 A3 Ap
B2 Bp Bq
Cp Cq C3
Dq D2 D3
Disk 2 Disk 3 Disk 4
page 54
Ap
B4
C4
D4
E4
Disk 5
Spare
Disk 5
Aq
B3
C3
D3
Disk 5