Technology background, Disk arrays, Media patrol – Promise Technology 2-Year Extended Warranty for VessR2000 RAID Head User Manual
Page 576: Technology background 549, Rrays, Edia, Atrol, Echnology, Ackground
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Product Manual
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echnology
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This chapter covers the following topics:
• “Disk Arrays” (see below)
• “Logical Drives” on page 551
• “RAID Controllers” on page 587
• “iSCSI Management” on page 593
• “Internet Protocols” on page 601
d
isk
a
rrays
Disk array technology includes:
• “PDM”
M
ediA
P
AtrOl
Media Patrol is a routine maintenance procedure that checks the magnetic media on each disk drive. Media
Patrol checks all physical drives assigned to disk arrays and spare drives. Media Patrol does not check unconfigured
drives.
Media Patrol checks are enabled by default on all disk arrays and spare drives. You can disable Media Patrol in
the disk array and spare drive settings, however that action is not recommended.
Unlike Synchronization and Redundancy Check, Media Patrol is concerned with the condition of the media itself,
not the data recorded on the media. If Media Patrol encounters a critical error, it triggers PDM, if PDM is enabled
on the disk array.
Media Patrol has three status conditions:
•
Running
– Normal. You can access your logical drives at any time.
•
Yield
– Temporary pause while a read/write operation takes place.