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Home > Success Center > Virtualization Manager (VMAN) > Virtualization Manager (VMAN) Getting Started Guide > Manage VM resources > How recommendations work

How recommendations work

Created by Lori Krell_ret, last modified by Melanie Boyd on Nov 22, 2016

Views: 108 Votes: 0 Revisions: 3

After you have deployed and configured VMAN, begin monitoring your virtual environment for active or potential bottlenecks, allocation needs, or performance issues. Depending on the size of your virtual environment, the amount of data to review can be staggering. To help pinpoint problems and optimization opportunities, VMAN lists recommendations for VM balancing, troubleshooting, and issue resolution.

As you monitor your entire environment, you can review your recommendations through My Dashboard > Virtualization > Recommendations. Recommendations trigger for vCenter and Hyper-V hosts, ESX hosts, clusters, and VMs.


Every recommendation includes:

  • Description of the active or predictive recommendation with metrics
  • Steps of actions the Orion Web Console completes when applied, without requiring manual steps using VM tools
  • Detailed statistics and charts show the before and after results based on the steps to take and issue determined
  • Further information on affected virtual systems, with links to drill down into the data

Through one page, you can investigate the issue, review the recommended resolutions, and apply the solution.

As you take any action on a recommendation or virtual system through the Orion Web Console or 3rd party management (like vCenter), the recommendations entirely recalculate. The Recommendations page and resources always display the latest recalculated list. You can also select to recalculate all recommendations with the option.

Want to see it in action? Watch this video:


Recommendation strategies look at the environment to solve specific issues and adjust allocations, performance, and storage. The strategies help manage VM sizing, host storage, and performance:

  • VM right sizing optimizations - Identifies and recommends changes for under- and over-allocated VM resources.
  • Host Performance and Capacity Assurance - Identifies hosts with resource and capacity issues.
  • Storage Capacity Assurance - Identifies datastores with storage capacity issues.
  • Balancing VMs on hosts - Identifies VMs to redistribute to new hosts for balanced resources, capacity, and performance.

    Migrating VMs is only possible between hosts that are in the same cluster and have shared storage.

Types of recommendations

VMAN provides to types of recommendations: active and predictive.

  • Active recommendations provide immediate resolutions for triggered alerts and issues that have already occurred on your system. An active recommendation requires a minimum of 1 hour of historic data to trigger.

    Example: You receive a memory utilization recommendation flagged as NOW on a host. The active recommendation immediately resolves the active issue when applied, properly balancing VMs to remove consumption issues.

  • Predictive recommendations provide advised actions based on historical data and usage trends. These actions require a minimum of 7 days of monitored VM data to trigger.

    Example: You receive a space utilization recommendation. A predictive resolution indicates reallocation steps for resources to resolve the issue for the affected VM and any linked datastores.

    The key to predictive recommendations is compiled data over time. Optimal recommendations trigger with over 4 weeks of accumulated data.

Recommendation actions

You can take one of the following actions for a recommendation:

  • Perform Now: immediately resolves the issue.
  • Schedule Recommendation: select a date and time to complete the steps. The Recommendation moves from the Current tab to the Scheduled tab. You may want to schedule the changes for maintenance times.

  • Ignore Recommendation: if you do not want to take the recommended actions, you can click More Actions and select Ignore Recommendation. This creates a short term exclusion policy for the VM for the recommendations with a custom amount of time.

Learn more...

To manage recommendations:

Last modified
18:23, 21 Nov 2016