NEC Disk Array Controller N8103-89 - Manual (Page 97)

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2. Media Patrol
The media patrol gives the read & verify test in the entire area of HDDs. It can be done 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 done by scheduling.
For HDDs configuring redundant logical drives in the 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 the 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.
Notice
Note the following for the media patrol:
„
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.
„
For the detailed operation, refer to the online manual "Web-based
Promise Array Manager User’s Guide" saved in the "S-ATA Array
Management Software" CD-ROM coming with the card.