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 installed 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 reconstructed using drives in the RAID group and the data is written back to another block of the drive in which the error occurred.
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 Disk Drive Patrol function is suspended during a drive sanitization. After drive sanitization is completed for all the target drives in the ETERNUS DX, the Disk Drive Patrol function is resumed.
The Maintenance Operation privilege is required to set detailed parameters.