ASM Block corruption can happen due to many reasons over lifetime (for example head misalignment, dust spec, and so on). If the disk groups are mirrored, ASM automatically repairs the corrupted blocks from the mirror.
The rest of the information in this section is only valid for this metric when it appears in either the Enterprise Manager Grid Control or the Enterprise Manager Database Control (if applicable).
The following table shows how often the metric's value is collected and compared against the default thresholds. The 'Consecutive Number of Occurrences Preceding Notification' column indicates the consecutive number of times the comparison against thresholds should hold TRUE before an alert is generated.
Target Version |
Evaluation and Collection Frequency |
Upload Frequency |
Operator |
Default Warning Threshold |
Default Critical Threshold |
Consecutive Number of Occurrences Preceding Notification |
Alert Text |
11.1.0.x; 11.2.0.x |
Every 5 Minutes |
After Every Sample |
MATCH |
Not Defined |
.* |
1* |
An ASM data block was corrupted at time/line number: %timeLine%. |
* Once an alert is triggered for this metric, it must be manually cleared.
For this metric you can set different warning and critical threshold values for each "Time/Line Number" object.
If warning or critical threshold values are currently set for any "Time/Line Number" object, those thresholds can be viewed on the Metric Detail page for this metric.
To specify or change warning or critical threshold values for each "Time/Line Number" object, use the Edit Thresholds page. See Editing Thresholds for information on accessing the Edit Thresholds page.
Incident metric
User can execute check and remap commands which have been implemented in Enterprise Manager.
Check
This checks the consistency of disk group metadata and logs the result in alert log and may repair depending upon repair/norepair option provided. In case of corruptions, the result would look like: "cache read a corrupted block group=NORM3 fn=1 blk=0 from disk 0" and so on.
Remap
This repairs a range of physical blocks that maps to a valid ASM file.
In addition, you can use Support Workbench in Enterprise Manager to examine the details of the incidents.
Related Topics
About Alerts
About the Metric Detail Page
Editing Thresholds
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