LaCie 5big Network 2 Uživatelský manuál stáhnout pdf (Strana 54)

LaCie 5big Network 2 • DESIGN BY NEIL POULTON Administering Your LaCie 5big Network 2

User Manual page 54

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 Protection

RAID 0 100%

RAID 5 80%

RAID 5+ Spare 60%

RAID 6 60%

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. 78). 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.

RAID5: In RAID 5, data is striped across all disks (minimum of three)

and a parity block for each data block (P in Fig. 79) is written on the

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 (Fig. 80).

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.

continued on the next page >>

Fig. 78

Fig. 79

Fig. 80

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Disk 1 Disk 2 Disk 3 Disk 4 Disk 5

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1 2 ... 49 50 51 52 53 54 55 56 57 58 59 ... 64 65

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