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2. Media Patrol
The media patrol gives the read & verify test in the entire area of HDDs. It is available for all HDDs assigned
to logical drives and hot-spare disks.
The media patrol allows subsequent defects of HDDs to be detected and repaired. Accordingly, routine
media patrol is recommended as preventive maintenance. Routine media patrol can be performed by
scheduling.
For HDDs configuring redundant logical drives in RAID1, RAID5, or RAID10 level or those assigned to
hot-spare disks, error sectors detected during media patrol can be repaired. For HDDs configuring
non-redundant logical drives in RAID0 level, error sectors are registered to the bad sector list (BSL) to be
managed.
If an access to a HDD being subject to media patrol occurs, the media patrol is interrupted temporarily and
continued from the interrupted point at the completion of the access. Thus, the media patrol can hardly
decrease the system performance.
Note the following for the media patrol:
Notice
In an environment of frequent HDD accesses, media patrol cannot be advanced well. In
such environment, it is recommended to use synchronization for preventive maintenance
instead of media patrol.
To enable media patrol, WebPAM must be installed.
By shipping default, media patrol is scheduled to be executed on every Wednesday at
00:00 for all the HDDs. You may change the schedule according to your operating
condition.
A "free" disk cannot be subject to media patrol. Thus it is recommended to define a "free"
disk as a hot-spare disk. Note, however, the disk which has previously been configured as
logical drive, can be subject to media patrol even if it is in "free" status.
For the detailed operation, refer to the online manual "Web-based Promise Array
Manager User's Guide" in the "SATA2 Array Management Software" CD-ROM coming
with the card.
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