Epson IR-320 Specifications download pdf (Page 300)

7-2 How to Use RAID Rev. D

What is RAID?

RAID is a disk subsystem that employs two or more ordinary hard disk drives in combination

for fault tolerance and performance. The IR-700 supports RAID 1 which provides for disk

mirroring. In a RAID system using mirroring, all data in the system is written simultaneously to

two separate hard disks within the same system. Since all the data is on the second drive, it is

ready to use if the first one fails. This ensures stability of computer operations, decreasing the

likelihood of data loss due to hard disk failure.

NOTE

The disk mirroring is intended only for backup purposes. It cannot be used for restoring lost data or

recovering from errors.

If both of the two hard disk drives fail, or the system fails, the backup function is disabled.

The IR-700 RAID system records the same data on the main and sub hard disk drives, and reads

the data from the main drive. In the event a failure occurs in the main drive, the sub drive

automatically takes over. In that case, the sub drive can duplicate error messages if automatic

e-mail alerts, pop-up message boxes, or the recording event log function has been enabled.

When one of the two disk drives is replaced, the system restructures RAID in the background.

The system can run applications while performing the background task.

Mirroring System

Data

a,b,c,d,e

Main Hard Disk Drive

a,b,c,d,e

Sub Hard Disk Drive

The same data is recorded on the two disk drives.

When reading data, the data comes from the main disk drive.

RAID Controller

When the Main Hard Disk Drive Fails

Pop-up message

System

E-mail

Event log

Main Hard Disk

Drive

Sub Hard Disk

Drive

The controller stops accessing the main drive and starts to use the sub drive as

the main immediately after the main drive fails.

RAID Controller

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Epson IR-320 Specifications Page 300