Patrol Read; Consistency Check - NEC Express5800/R140a-4 User Manual

4-44 Configuring Your Server

Patrol Read

The patrol read gives the read & verify test in the entire area of HDDs. It can be performed for all
HDDs assigned to virtual disks and hot-spares.
The Patrol Read allows subsequent defects of HDDs to be detected and repaired.
For HDDs configuring redundant virtual disks or those assigned to hot-spares, error sectors detected
during Patrol Read can be repaired.
IMPORTANT:
For the Onboard RAID Controller (MegaRAID ROMB), Patrol
Read feature is factory-set to "Enabled". For N8103-90 Disk Array
Controller (for external SAS HDD), Patrol Read feature is either
enabled or disabled depending on firmware.
To change settings of Patrol Read, use Universal RAID Utility.
If the system is restarted while running Patrol Read, Patrol Read
resumes from that point.

Consistency Check

The Consistency Check is used to check consistency among virtual drives. It is available for
redundant virtual drives except for RAID0.
Consistency Check can be performed through WebBIOS or Universal RAID Utility.
Consistency Check performs not only consistency check but also repair of error sectors.
Accordingly, it can be used as preventive maintenance.
IMPORTANT:
During Consistency Check, the processing rate is decreased due to
much load.
If the system is restarted, the Consistency Check is aborted.
However, the Consistency Check resumes after restart.
To schedule execution of Consistency Check, use WebBIOS, not the
Universal RAID Utility
Note the following for the patrol read:
Note the following for Consistency Check: