Disk Count for Alerts will have the same value as Available Disks if there is more than one disk in the failure group. If there is exactly one disk in the failure group, Disk Count for Alerts will be 1, regardless if that one disk is offline. The reason for this is to avoid duplicate alerts being generated for the same root cause. The disk_status metric will generate a critical alert when a disk goes offline.
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 |
|
10.1.0.x; 10.2.0.x; 11.1.0.x; 11.2.0.x |
Every 15 Minutes |
After Every Sample |
= |
Not Defined |
0 |
1 |
Failure Group %diskGroup%.%failureGroup% is offline. |
For this metric you can set different warning and critical threshold values for each unique combination of "Disk Group" and "Failure Group" objects.
If warning or critical threshold values are currently set for any unique combination of "Disk Group" and "Failure Group" objects, those thresholds can be viewed on the Metric Detail page for this metric.
To specify or change warning or critical threshold values for each unique combination of "Disk Group" and "Failure Group" objects, use the Edit Thresholds page. See Editing Thresholds for information on accessing the Edit Thresholds page.
Disk Count for Alerts is set to 1 if there is only one disk in the disk group, otherwise it is set to the value of Available Disks.
A critical alert will be generated if all disks comprising a failure group are taken offline. In this situation, data is not being mirrored, despite the disk group having been configured with normal or high redundancy. Action must be taken to bring some of the disks in the failure group back online, or to add more disks to the disk group and assign them to that failure group.
Related Topics
About Alerts
About the Metric Detail Page
Editing Thresholds
Understanding Line Charts
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