ZyXEL NSA-2401 User Manual download pdf (Page 153)

Chapter 6 Storage Screens

NSA-2401 User’s Guide

153

6.9.3 RAID 0

RAID 0 spreads data evenly across two or more disks (data striping) with no mirroring nor

parity for data redundancy, so if one disk fails the entire array will be lost. The major benefit

of RAID 0 is performance. The following figure shows two disks in a single RAID 0 array.

Data can be written and read across disks simultaneously for faster performance.

RAID 0 capacity is the size of the smallest disk multiplied by the number of disks you have

configured at RAID 0 on the NSA. For example, if you have four disks of sizes 100 GB, 150

GB, 150 GB and 200 GB respectively in one RAID 0 array, then the maximum capacity is 400

GB (4 * 100 GB, the smallest disk size) and the remaining space (300 GB) is unused.

Typical applications for RAID 0 are non-critical data (or data that changes infrequently and is

backed up regularly) requiring high write speed such as audio, video, graphics, games and so

on.

6.9.4 RAID 1

RAID 1 creates an exact copy (or mirror) of a set of data on another disk. This is useful when

data backup is more important than data capacity. The following figure shows two disks in a

single RAID 1 array with mirrored data. Data is duplicated across two disks, so if one disk

fails, there is still a copy of the data.

As RAID 1 uses mirroring and duplexing, a RAID 1 array needs an even number of disks (two

or four for the NSA).

Table 38 RAID 0

A1 A2

A3 A4

A5 A6

A7 A8

DISK 1 DISK 2

Table 39 RAID 1

A1 A1

A2 A2

A3 A3

A4 A4

DISK 1 DISK 2

1 2 ... 148 149 150 151 152 153 154 155 156 157 158 ... 361 362

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ZyXEL NSA-2401 User Manual Page 153