ZyXEL NSA-2400 Guia Do Utilizador

Chapter 7 Storage Screens

NSA-2400 User’s Guide

The capacity of a RAID 5 volume is the smallest disk in the RAID set multiplied by one less 
than the number of disks in the RAID set. For example, if you have four disks of sizes 150 GB, 
150 GB, 200 GB and 250 GB respectively in one RAID 5 volume, then the maximum capacity 
is 450 GB (3 * 150 GB, the smallest disk size) and the remaining space (300 GB) is unused.

Typical applications for RAID 10 are transaction processing, relational database applications, 
enterprise resource planning and other business systems. For write-intensive applications, 
RAID 1 or RAID 1+0 are probably better choices, as the performance of RAID 5 will begin to 
substantially decrease in a write-heavy environment.

RAID 5_(3 + hot-spare) operates as a RAID 5 with three disks while the fourth disk is on 
standby. The standby disk automatically comes into play if a disk in the volume fails. The 
advantage of RAID5_(3 + hot-spare) over RAID 5 is that if a disk fails, then the volume 
resynchronizes automatically with the standby disk and operates at healthy volume speed after 
the resynchronization.

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You need four hard disks to use RAID 10, and RAID5_(3 + hot-spare) on the 
NSA-2400. 

If a hard disk fails and you’re using a RAID 1, RAID 10, or RAID 5 volume then your data 
will still be available (but at degraded speeds until you replace the hard disk that failed and 
resynchronize the volume). However, RAID cannot protect against file corruption, virus 
attacks, files incorrectly deleted or modified, or the NSA-2400 malfunctioning. See 

 for what you should use in these cases to protect data on your NSA-2400.

Click the Volume tab to display the volume summary screen as shown.

Figure 49   Storage > Volume