XenCenter

Excluding Hosts from Recommendations

When configuring Workload Balancing, you can specify that specific physical hosts are excluded from Workload Balancing optimization and placement recommendations, including Start On placement recommendations.

When to exclude hosts

Situations when you might want to exclude hosts from recommendations include when:

  • You want to run the pool in Maximum Density mode and consolidate and shut down hosts, but there are specific hosts you want to exclude from this behavior.
  • When two VM workloads must always run on the same host (for example, if they have complementary applications or workloads).
  • You have workloads that you do not want moved (for example, domain controllers or SQL Server).
  • You want to perform maintenance on a host and you do not want virtual machines placed on the host.
  • The performance of the workload is so critical that the cost of dedicated hardware is irrelevant.
  • Specific hosts are running high-priority workloads (virtual machines), and you do not want to use the High Availability feature to prioritize these virtual machines.
  • The hardware in the host is not the optimum for the other workloads in the pool.

Regardless of whether you specify a fixed or scheduled optimization mode, excluded hosts remain excluded even when the optimization mode changes. To prevent Workload Balancing from powering down a host automatically, consider not enabling Power Management for that host. For more information, see Optimizing and Managing Power Automatically.

To exclude hosts from placement and optimization recommendations

  1. Select the pool in the Resources pane, select the WLB tab, and select Settings.
  2. In the left pane, select Excluded Hosts.
  3. In the Excluded Hosts page, select the hosts for which you do not want Workload Balancing to recommend alternate placements and optimizations.

Excluding Hosts from Recommendations