Disk Drive Patrol; Redundant Copy; Figure 3.2 Drive Check; Figure 3.3 Redundant Copy Function - Fujitsu ETERNUS DX60 S3 Overview Manual

Chapter 3 Functions
3.1 Data Protection
3.1.2

Disk Drive Patrol

The Disk Drive Patrol function regularly diagnoses and monitors the operational status of all drives that are
installed in the ETERNUS DX. Drives are checked (read check) regularly as a background process.

Figure 3.2 Drive Check

The data is read and
checked
3.1.3

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 re-
dundancy.

Figure 3.3 Redundant Copy Function

RAID5 (Redundant)
RAID5 (Redundant)
D1
RAID group
Sign of
failure
Disconnected
FUJITSU Storage ETERNUS DX60 S3 Disk storage system Overview
Copyright 2014 FUJITSU LIMITED
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.
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