5.2

Table Of Contents
Table 84. Concurrent Operations Limits for vCenter Server and View Composer
Setting Description
Max concurrent vCenter provisioning operations Determines the maximum number of concurrent requests
that View Manager can make to provision and delete full
virtual machines in this vCenter Server instance.
The default value is 20.
This setting applies to full virtual machines only.
Max concurrent power operations Determines the maximum number of concurrent power
operations (startup, shutdown, suspend, and so on) that
can take place on virtual machines managed by View
Manager in this vCenter Server instance.
The default value is 50.
For guidelines for calculating a value for this setting, see
“Setting a Concurrent Power Operations Rate to Support
View Desktop Logon Storms,” on page 101.
This setting applies to full virtual machines and linked
clones.
Max concurrent View Composer maintenance operations Determines the maximum number of concurrent View
Composer refresh, recompose, and rebalance operations
that can take place on linked clones managed by this View
Composer instance.
The default value is 12.
Desktops that have active sessions must be logged off
before a maintenance operation can begin. If you force
users to log off as soon as a maintenance operation begins,
the maximum number of concurrent operations on
desktops that require logoffs is half the configured value.
For example, if you configure this setting as 24 and force
users to log off, the maximum number of concurrent
operations on desktops that require logoffs is 12.
This setting applies to linked clones only.
Max concurrent View Composer provisioning operations Determines the maximum number of concurrent creation
and deletion operations that can take place on linked
clones managed by this View Composer instance.
The default value is 8.
This setting applies to linked clones only.
Setting a Concurrent Power Operations Rate to Support View Desktop Logon
Storms
The Max concurrent power operations setting governs the maximum number of concurrent power
operations that can occur on View desktop virtual machines in a vCenter Server instance. Starting in View
5.0, this limit is set to 50 by default. You can change this value to support peak power-on rates when many
users log on to their desktops at the same time.
As a best practice, you can conduct a pilot phase to determine the correct value for this setting. For planning
guidelines, see "Architecture Design Elements and Planning Guidelines" in the VMware Horizon View
Architecture Planning document.
The required number of concurrent power operations is based on the peak rate at which desktops are
powered on and the amount of time it takes for the desktop to power on, boot, and become available for
connection. In general, the recommended power operations limit is the total time it takes for the desktop to
start multiplied by the peak power-on rate.
For example, the average desktop takes two to three minutes to start. Therefore, the concurrent power
operations limit should be 3 times the peak power-on rate. The default setting of 50 is expected to support a
peak power-on rate of 16 desktops per minute.
Chapter 8 Configuring View for the First Time
VMware, Inc. 101