User guide

3.9 Media Patrol
The media patrol reads data in the HDDs listed below. HDDs can be altered by age, and faults in
the HDDs may be detected only when they are accessed. By reading routinely the entire data in
the HDDs, the media patrol detects such faults and enables you to take a preventive action.
 HDDs configuring a RAID array
 HDDs set to spares
If an access occurs during media patrol, it is temporarily interrupted until the access is
completed. Because of this, the media patrol does not decrease the system performance. As it
has a lower priority than other tasks in the system, we recommend you use the media patrol in
the environment where your system is subject to a comparatively small load at a given time,
including the night.
IMPORTANT:
 Media patrol is scheduled by default to run at 0:00 a.m. on Wednesday
every week just after installation of WebPAM PRO. Change the schedule
according to your environment.
 The RAID system does not allow media patrol to be set individually in
HDDs.
 Media patrol is not done for HDDs not configuring a disk array or for
HDDs not specified as spare. Specify unconfigured HDDs to hot spare.
 Media patrol can detect media errors of HDDs early and only repair
HDDs that are members of redundant RAIDs. However, it does not check
whether HDDs are consistent with parity.
 The feature can run media patrol of specified HDDs at the specified time
only once (scheduled media patrol is run periodically every specified start
time). Media patrol is not run consistently.
Follow the procedure below to provide media patrol.
1. Click the subsystem (ST EX4650EL) icon in the Tree View.
2. Click the downward arrow at the right end of the Background Activities tab in the
Management Window and then click Start Media Patrol.
3. Click [Start].
The media patrol starts.
The progress of the media patrol appears in the Background Activities tab. If you click the link
- 56 -