Fujitsu Eternus DX500 S3 - Disk Drive Patrol; Redundant Copy; Figure 6 Drive Check; Figure 7 Redundant Copy Function

Data is protected at the SCSI level on the path to the server. Therefore, data integrity can be ensured even if data
is corrupted during a check code reassignment.
By linking the Data Integrity Extensions (DIX) function of Oracle DB, data integrity can be ensured in the entire
system including the server.
Disk Drive Patrol
The Disk Drive Patrol function regularly diagnoses and monitors the operational status of all drives that are in-
stalled in the
ETERNUS DX. Drives are checked (read check) regularly as a background process.
Figure 6 Drive Check
RAID group
D1
The dat
a is read and
checked
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 redun-
dancy.
Figure 7 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)
3. Basic Functions
Data Protection
30
FUJITSU Storage ETERNUS DX500 S3/DX600 S3 Hybrid Storage Systems
Overview
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