Chapter 1 Overview
1.3 Functions
ETERNUS DX60/DX80/DX90 Disk storage system User Guide
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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 func-
tion, you can restore the data while maintaining redundancy.
Figure 1.11 Redundant Copy Function
Hot Spare
RAID5 (Redundancy)
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.
Sign of
failure
Disconnected
RAID5 (Redundancy)
