Lenovo ThinkServer RD240 Software User's Manual page 318

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– Auto: Patrol read runs automatically at the time interval you
specify on this screen.
– Manual: Patrol read runs only when you manually start it by
selecting Start Patrol Read from the controller Options panel.
– Disabled: Patrol read does not run.
7. (Optional) Specify a maximum count of drives to include in the patrol
read. The count must be between 0 and 255.
8. (Optional) Select virtual drives on this controller to exclude from the
patrol read. The existing virtual drives are listed in the gray box.
To exclude a virtual drive, check the box next to it.
9. (Optional) Change the frequency at which the patrol read will run.
The default frequency is 7 days (168 hours), which is suitable for
most configurations. (You can select second, minute, or hour as the
unit of measurement.)
Note: It is recommended that you leave the patrol read frequency
and other patrol read settings at the default values to
achieve the best system performance. If you decide to
change the values, record the original default value here so
you can restore them later, if necessary:
Patrol Read Frequency: ___________________
Continuous Patrolling: Enabled/Disabled
Patrol Read Task Rate: ___________________
10. (Optional) Select Continuous Patrolling if you want patrol read to
run continuously in the background instead of running at periodic
intervals. If you select Continuous Patrolling, the time interval field is
grayed out.
11. Click Go to enable these patrol read options.
Note: Patrol read does not report on its progress while it is
running. The patrol read status is reported in the event log
only.
You can also (optionally) change the patrol read task rate. The task rate
determines the amount of system resources that are dedicated to a
patrol read when it is running. It is recommended, however, that you leave
the patrol read task rate at its default setting. If you raise the task rate
above the default, foreground tasks will run more slowly and it may seem
that the system is not responding. If you lower the task rate below the
Monitoring System Events and Storage Devices