ZyXEL NSA-2401 User Manual download pdf (Page 154)

Chapter 6 Storage Screens

NSA-2401 User’s Guide

154

RAID 1 capacity is limited to the size of the smallest disk in the RAID array. For example, if

you have two disks of sizes 150 GB and 200 GB respectively in one RAID 1 array, then the

maximum capacity is 150 GB and the remaining space (50 GB) is unused.

Typical applications for RAID 1 are those requiring high fault tolerance without need of large

amounts of storage capacity or top performance, for example, accounting and financial data,

small database systems, and enterprise servers.

6.9.5 RAID 10

RAID 10 (RAID 1+0) is a nested RAID where two RAID 1 arrays are stored on the physical

disks with a RAID 0 array on top. It is a stripe of mirrors. RAID 1 provides redundancy while

RAID 0 boosts performance. The following figure shows two disks in two RAID 1 arrays.

Data is duplicated across two disks, so if one disk fails, there is still a a copy of the data. These

two arrays are configured as a single RAID 0 array for faster performance

Typical applications for RAID 10 are those requiring both high performance and reliability

such as enterprise servers and high-end moderate-sized database systems. RAID 10 is often

used in place of RAID 1 or RAID 5 by those requiring higher performance. It may be used

instead of RAID 1 for applications requiring more capacity.

Table 40 RAID 10

RAID 0

RAID 1 RAID 1

A1 A1 A2 A2

A3 A3 A4 A4

A5 A5 A6 A6

A7 A7 A8 A8

DISK 1 DISK 2 DISK 3 DISK 4

1 2 ... 149 150 151 152 153 154 155 156 157 158 159 ... 361 362

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ZyXEL NSA-2401 User Manual Page 154