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

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
RAID group
D1
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
Hot spare
Creates data from the drives other than
the maintenance target drive, and
writes data into the hot spare.
Disconnects the maintenance target drive
and switches it to the hot spare.
Disconnected
RAID5 (Redundant)
Sign of
failure
RAID5 (Redundant)
Chapter 3 Functions
3.1 Data Protection
26
FUJITSU Storage ETERNUS DX60 S3 Disk storage system
Overview
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