ETERNUS DX60/DX80/DX90 Disk storage system User Guide - Fujitsu

Chapter 1 Overview
1.3 Functions
1.3.2 Redundant Copy
The Redundant Copy function creates data in the disk, in which the Disk Patrol function decides
that preventative maintenance is required, from the other disks to the hot spare. With this function,
you can restore the data while maintaining redundancy.
RAID5 (Redundancy)
RAID5 (Redundancy)
Disconnected
Sign of
failure
Figure 1.11 Redundant Copy Function
Hot Spare
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ETERNUS DX60/DX80/DX90 Disk storage system User Guide
Creates data from the disks other than
the maintenance target disk, and
writes data into the hot spare.
Disconnects the maintenance target disk
and switches it to the hot spare.
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