Administrator Guide

Thresholds
Threshold alerts are automatically generated when user-defined threshold definitions for storage object usage are crossed. Threshold
queries allow you to query historical data based on threshold criteria.
Configuring Threshold Definitions
Threshold definitions monitor the usage metrics of storage objects and generate alerts if the user-defined thresholds are crossed.
The types of usage metrics that can be monitored are I/O usage, storage, and replication. Unisphere Central collects the usage metric
data from managed Storage Centers. By default, Unisphere Central collects I/O usage and replication metric data every 15 minutes and
storage usage metric data daily at 12 AM. Storage objects on the Storage Centers are assigned to threshold definitions and each threshold
definition contains one or more threshold values. When the value of a monitored metric reaches a threshold value, an alert occurs. If an
SMTP server is configured on the Data Collector, Unisphere Central sends an email with the threshold alert. It sends only one email alert
every 24 hours.
NOTE: Unisphere Central sends only one email per alert occurrence. If after 24 hours the metric is still at or above the
threshold alert value, an alert email is not sent. The metric must fall below the threshold value and then exceed the
threshold again to generate an alert email.
Perform the tasks in the following sections to set up and view threshold definitions:
• Setting Up Threshold Definitions
• Assigning Storage Objects to Threshold Definitions
• Assigning Threshold Definitions to Storage Objects
Setting Up Threshold Definitions
You can create, view, edit, and delete threshold definitions.
Create a Threshold Definition
Create a threshold definition to monitor IO usage, storage, or replications.
Prerequisites
To receive email notifications for threshold alerts, the following settings must be configured:
• SMTP server settings for the Data Collector
• Email address for your user account
• Notification settings for your user account
About this task
Unisphere Central generates threshold alerts after Storage Usage checks usage metrics and notices a threshold definition has been
exceeded. Storage Usage runs daily at 12 AM by default.
Steps
1.
If a Storage Center is selected from the drop-down list, click (Home) in the left navigation pane of Unisphere Central.
2. From the MONITORING menu, click Thresholds.
The Thresholds view is displayed.
3. Click the Definitions tab.
4. Click (New). The General page of the Create Threshold Definition wizard opens.
5. Enter a name for the threshold definition in the Name field.
6. Select the type of threshold definition to create from the Type drop-down menu.
• IO Usage: Read and write IO performance.
• Storage: Use and growth of storage.
• Replication: Status of replications.
7. Select the type of storage object to assign to the threshold definition from the Alert Object Type drop-down menu.
8. Select the type of usage metric to monitor from the Alert Definition drop-down menu.
Storage Center Monitoring
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