7.4 Preferences

The Preferences subtab allows you to change the default values used by Oracle VM Manager. The management pane contains a form that allows you to change different variable values.

The options listed here apply to different functionalities within Oracle VM Manager. These are described below:

  • Refresh Job Timeout Value: This radio button controls whether or not a timeout value is applied for long running jobs, such as refreshing the list of available file systems. If a timeout value is set, specify the number of seconds to wait before timing out in the field provided.

  • Collect System Statistics: This radio button controls whether or not to collect statistical information about such items as processor and memory usage on Oracle VM Servers and virtual machines, as well as file system utilization for file systems that host repositories and server pools.

    You might choose to disable statistics collection in order to perform static analysis of statistics data or gather statistics data without the dynamic changes that occur when statistics collection is enabled. However, it is recommended that you disable statistics collection for short periods of time only. If you disable statistics collection, Oracle VM Manager:

    • Displays messages in the Health tab to indicate statistics collection is disabled.

    • No longer collects statistics for server and virtual machine CPU and memory utilization.

    • Does not display information in the Status Overview dashboard.

    • Displays only the information that was collected up to the point when statistics collection was disabled. As a result, the statistics information that Oracle VM Manager displays in the Server and VM Statistics and File System Statistics subtabs becomes old, or stale, soon after statistics collection is disabled.

    • Stops using statistics to calculate the most suitable server on which to start virtual machines. In some cases, this scenario could result in virtual machines starting on servers that already have high CPU or memory utilization.

  • Statistics Collection Interval: This field allows you to specify how frequently statistics are collected for servers. The statistics are used within Oracle VM Manager on the Health tab. The value for this field can be between 20 seconds and 31,536,000 seconds (one year). For more information on server statistics see Section 2.3, “Server and VM Statistics”. For more information on file system statistics see Section 2.4, “File System Statistics”.

  • Statistics Collection Hold Time: This field allows you to specify how long statistics are stored by Oracle VM Manager before they are refreshed. The statistics are used within Oracle VM Manager on the Health tab. The value for this field can be between 15 minutes and 4320 minutes (3 days). The default value is 60 minutes. For more information on server statistics see Section 2.3, “Server and VM Statistics”. For more information on file system statistics see Section 2.4, “File System Statistics”.

  • Statistics Archive Interval: This field allows you to specify how often Oracle VM Manager deletes archived statistics. Oracle VM Manager uses the value from the Statistics Collection Hold Time field to calculate how many archived statistics to delete. For example, you set the hold time to 15 minutes and the archive interval to 2 days. In this case, every 2 days Oracle VM Manager deletes archived statistics that are older than 15 minutes from the current time. The value for this field can be between 30 minutes and 525,600 minutes (1 year). The default value is 60 minutes.

  • File System Statistics Collection Interval: This field allows you to specify how frequently file system statistics are collected from designated servers. These statistics are used to accurately display the total available disk space, the currently used disk space and the remaining disk space for any file system that is mounted on an Oracle VM Server within the environment. The statistics are also used to monitor utilization as described in Section 2.3, “Server and VM Statistics”. The default value for this option is set to 600 seconds. The value for this field can be between 60 seconds and 31,536,000 seconds (one year).

  • DB Backup Interval: This field allows you to specify how frequently the automated backups of the Oracle VM Manager database are performed. The value is measured in minutes and can be any value between 360 minutes (6 hours) and 43200 minutes (30 days). For more information on database backups, please refer to Backing up the MySQL Database Repository in the Oracle VM Administrator's Guide.

  • Number of DB Backups to Keep: This field allows you to specify how many of the automated backups of the Oracle VM Manager database are retained before they are rotated. The value can be between 1 and 500. For more information on database backups, please refer to Backing up the MySQL Database Repository in the Oracle VM Administrator's Guide.

The configuration parameters can be changed with instant effect. No restart of Oracle VM Manager is required.

Note

Changes to the DB Backup Interval of the Number of DB Backups to Keep options are not automatically reflected in alternative sessions accessing the Oracle VM Manager Web Interface. Equally, if these parameters are changed in an alternative session accessing the Oracle VM Manager Web Interface or via the Oracle VM Manager Command Line Interface, the values displayed in these fields are not automatically updated in real time. The values displayed here can be refreshed by clicking on an alternate tab withing the user interface and then returning to the Reports and Resources tab.

See No File Systems Found When Searching a Storage Server in the Oracle VM Administrator's Guide for more information on when these UI preferences should be changed.