XenCenter

Entering maintenance mode with Workload Balancing Enabled

Note:

XenCenter 2023.x.x is currently in preview and is not supported for production use. Note that any future references to production support apply only when XenCenter 2023.x.x and XenServer 8 go from preview status to general availability.

You can use XenCenter 2023.x.x to manage your XenServer 8 and Citrix Hypervisor 8.2 CU1 non-production environments. However, to manage your Citrix Hypervisor 8.2 CU1 production environment, use XenCenter 8.2.7. For more information, see the XenCenter 8.2.7 documentation.

You can install XenCenter 8.2.7 and XenCenter 2023.x.x on the same system. Installing XenCenter 2023.x.x does not overwrite your XenCenter 8.2.7 installation.

When WLB is enabled, if you take a host offline for maintenance, XenServer automatically migrates the VMs running on that host to their optimal servers when available. XenServer migrates them based on Workload Balancing recommendations (performance data, your placement strategy, and performance thresholds).

If an optimal server is not available, the words Click here to suspend the VM appear in the Enter Maintenance Mode dialog box. In this case, Workload Balancing does not recommend a placement because no host has sufficient resources to run this virtual machine. You can either suspend this virtual machine or exit maintenance mode and suspend a virtual machine on another host in the same pool. Then, if you reenter the Enter Maintenance Mode dialog box, Workload Balancing might be able to list a host that is a suitable candidate for migration.

Note:

When you take a server offline for maintenance and Workload Balancing is enabled, the words “Workload Balancing” appear in the upper-right corner of the Enter Maintenance Mode dialog.

To enter maintenance mode with Workload Balancing enabled

  1. In the Resources pane, select the server and then do one of the following:
    • Right-click and select Enter Maintenance Mode on the shortcut menu.
    • On the Server menu, select Enter Maintenance Mode.
  2. Select Enter Maintenance Mode. The VMs running on the server are automatically migrated to the optimal host based on Workload Balancing’s performance data, your placement strategy, and performance thresholds.

To take the server out of maintenance mode

  1. In the Resources pane, select the server and then do one of the following:
    • Right-click and select Exit Maintenance Mode on the shortcut menu.
    • On the Server menu, select Exit Maintenance Mode.
  2. Select Exit Maintenance Mode.

    When you remove a server from maintenance mode, XenServer automatically restores that server’s original virtual machines to that server.

Entering maintenance mode with Workload Balancing Enabled