Note About Media Error; Figure 2-4 Example Of A Message Box When A Media Error Occurs - Hitachi HF-W6500 45/40 Feature Manual

2.8.2 Note about media error

Media error is a status where there is a problem in data integrity while the RAID status is
normal. If read errors occur at the copy source drive during a rebuild process, the rebuild
process will complete but the sector data that could not be read is already lost, indicating a
data integrity problem.
<Handling a media error as a failure>
The severity of this data integrity problem depends on whether those bad sectors with
read errors are actually used. If those bad sectors are used, there is a real problem in data
integrity. But if not, that is not a problem at all.
This is why this equipment allows you to select, depending on the system operation,
whether a media error is handled as a failure. When you select the setting, use the raidctr
RAID configuration control command. (For details, see "5.3 RAID Configuration
Control Command (raidctrl) [D Model only]".) By default, a media error is not
recognized as a failure. When a media error is handled as a failure, a media error is
notified of as a error status of the RAID using the following methods.
• Event notification
• Outputs on the status display digital LEDs
• Remote notification
• Alarm lamp
• MCALL contact of the RAS external contact interface
• Message box

Figure 2-4 Example of a Message Box when a Media Error Occurs

In addition, you can check for media errors using the event log, the hfwRaidStat function
in the RAS library, and the raidctr RAID configuration control command regardless of
whether a media error is handled as a failure.
2. ITEMS MONITORED BY THE RAS FEATURE
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