Redundant Copy; Figure 5.3 Redundant Copy Function - Fujitsu ETERNUS DX80 S2 Overview

Disk storage system

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Chapter 5 Basic Functions

5.1 Data Protection

5.1.3

Redundant Copy

When the Disk Patrol function decides that preventative maintenance is required for a drive, the Redundant

Copy function uses the remaining drives to re-create the data of the maintenance target drive and writes the

data to the hot spare. The Redundant Copy function enables data to be restored while maintaining data

redundancy.

RAID5 (Redundant)

If a bad sector is detected when a drive is checked, a replacement track is automatically allocated. This drive

is not recognized as having a drive failure during this process. However, the drive will be disconnected by the

Redundant Copy function if the spare sector is insufficient and the problem cannot be solved by allocating a

replacement track.

Sign of

failure

Disconnected

ETERNUS DX80 S2/DX90 S2 Disk storage system Overview

Creates data from the drives other than

the maintenance target drive, and

writes data into the hot spare.

Hot spare

Disconnects the maintenance target drive

and switches it to the hot spare.

P3AM-4812-11ENZ0

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Eternus dx90 s2