ZyXEL Communications NSA-2401 用户手册

Chapter 6 Storage Screens

NSA-2401 User’s Guide

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.

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