Disk Drive Patrol
In the ETERNUS DX, all of the drives are checked in order to detect drive errors early and to restore drives from
errors or disconnect them.
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.
For drive checking, read check is performed sequentially for a part of the data in all the drives. If an error is
detected, data is restored using drives in the RAID group and the data is written back to another block of the
drive in which the error occurred.
Figure 13 Disk Drive Patrol
RAID group
D1
D1
D1
D2
D3
P
RAID group
Error
D1 to D3: Data
D1
P: Parity
Error detection
Data is read and
checked.
The data is written back
to another block.
Data reconstruction
Read checking is performed during the diagnosis.
These checks are performed in blocks (default 2MB) for each drive sequentially and are repeated until all the
blocks for all the drives have been checked. Patrol checks are performed every second, 24 hours a day (default).
Drives that are stopped by Eco-mode are checked when the drives start running again.
The Maintenance Operation privilege is required to set detailed parameters.
2. Basic Functions
Data Protection
33
FUJITSU Storage ETERNUS DX500 S4/DX600 S4, ETERNUS DX500 S3/DX600 S3 Hybrid Storage Systems Design Guide (Basic)
Copyright 2019 FUJITSU LIMITED
P3AM-7722-25ENZ0
Summary of Contents for ETERNUS DX500 S3/DX600 S3
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