User's Manual

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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 Modedialog 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 box.
To enter maintenance mode with Workload Balancing enabled
1. In the Resources pane of XenCenter, select the physical host that you want to take offline. From the
Server menu, select Enter Maintenance Mode.
2. In the Enter Maintenance Mode dialog box, click Enter maintenance mode. The virtual machines
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, right-click the server and select Exit Maintenance Mode.
When you remove a server from maintenance mode, XenServer automatically restores that server's original
virtual machines to that server.
Working with Workload Balancing Reports
This topic provides general information about Workload Balancing historical reports and an overview of
where to find additional information about these reports.
To generate a Workload Balancing report, you must have installed the Workload Balancing component,
registered at least one resource pool with Workload Balancing, and configured Workload Balancing on at
least one resource pool.
Introduction
Workload Balancing provides reporting on three types of objects: physical hosts, resource pools, and virtual
machines. At a high level, Workload Balancing provides two types of reports:
• Historical reports that display information by date
• "Roll up" style reports
Workload Balancing provides some reports for auditing purposes, so you can determine, for example, the
number of times a virtual machine moved.
Subscribing to Workload Balancing Reports
By subscribing to Workload Balancing reports, you can schedule for Workload Balancing to deliver individual
reports with the options you want enabled on a preset schedule and have the reports delivered to your
email account.
For example, to subscribe to a report, you generate a report that specifies the objects (hosts, pools, and
so on) and settings you want in the subscribed report and then subscribe to it. Then, you specify the time