Patrol Read Feature; Manual Execution Of Patrol Read - NEC Express5800 series User Manual

46 Operation

3.5 Patrol Read Feature

The Patrol Read feature operates in physical drives configuring all arrays including hot-spare disks
to detect errors and recover the system from the errors if they are detected.
IMPORTANT: The Check Consistency function and the Patrol Read
function allow you to find the defects (due to degradation such as aging) in
files of low access frequency and unused areas as soon as possible. In
rebuilding after replacement of a HDD due to a failure, subsequent defects
may be found in remaining HDDs. In such a case, the system cannot be
recovered. Thus, detecting subsequent defects as early as possible is
extremely effective as preventive maintenance. Periodical synchronization
or media patrol is effective to keep the stable operation of your system. It is
strongly recommended to take the action once per week or at least once per
month.
3.5.1

Manual Execution of Patrol Read

The Patrol Read can be executed manually in the following procedure.
Patrol Read execution procedure
1. Under the selection of a controller on the Physical/Logical View, click [Operations] →
[Start Patrol Read] on the menu bar.
2. If the confirmation dialog shown below appears, click [Yes].
The Patrol Read is executed.