Redundancy Check - NEC EXPRESS5800 User Manual

3.8 Redundancy Check

Routine redundancy check allows consistencies to be detected, checked and repaired to prevent
rebuild from failing at occurrence of a fault in an HDD. This is possible for logical drives of
RAID level 1, 10 or 5. The redundancy check can also repair bad sectors detected during
inconsistency check. To keep a RAID system operating stably, it is highly recommended to
provide routine redundancy check by using the scheduling feature.
The redundancy check is executable however system load may be and thus can be used in a
system environment where accessing to HDDs occurs frequently to always apply high load to
them.
IMPORTANT:
To provide a logical drive with redundancy check, follow the procedure below.
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 Redundancy Check.
3. Make settings required for the redundancy check.
Redundant Logical
Drive
AutoFix
Pause On Error
4. Click [Submit].
The redundancy check is started.
Redundancy check for a logical drive not full-
initialized or not subject to redundancy check in the
Auto Fix mode at all is forcibly set to the Auto Fix
mode.
Note that load is applied to the system to decrease its
processing rate during redundancy check.
Select a logical drive to be subject to redundancy check from the
pull-down menu.
Set processing to be done when an inconsistency error is
detected.
If Auto Fix is checked, data in other HDDs configuring RAID is
repaired at detection of an inconsistency error.
If Auto Fix is not checked, any inconsistency error detected is not
repaired.
Set whether the processing is paused when an inconsistency error
is detected.
If Pause On Error is checked, processing is paused at detection of
an inconsistency error. However, if Auto Fix is also checked,
processing is paused only when the error cannot be repaired.
If Pause On Error is not checked, the processing is not paused in
spite of detection of an inconsistency error.
- -
38