7.2

Table Of Contents
n
<add key="MachineCatalogUnregistrationRetryTimerCallbackMilliseconds"
value="120000"/>
n
<add key="MachineCatalogUpdateMaxRetryCount" value="15"/>
Setting Resource-Intensive Concurrency Limits
To conserve resources, vRealize Automation limits the number of concurrently running instances of
machine provisioning and data collection. You can change the limits.
Configuring Concurrent Machine Provisioning
Multiple concurrent requests for machine provisioning can impact the performance of
vRealize Automation. You can make some changes to limits placed on proxy agents and workflow
activities to alter performance.
Depending on the needs of machine owners at your site, the vRealize Automation server may receive
multiple concurrent requests for machine provisioning. This can happen under the following
circumstances:
n
A single user submits a request for multiple machines
n
Many users request machines at the same time
n
One or more group managers approve multiple pending machine requests in close succession
The time required for vRealize Automation to provision a machine generally increases with larger
numbers of concurrent requests. The increase in provisioning time depends on three important factors:
n
The effect on performance of concurrent resource-intensive vRealize Automation workflow activities,
including the SetupOS activity (for machines created within the virtualization platform, as in WIM-
based provisioning) and the Clone activity (for machines cloned within the virtualization platform).
n
The configured vRealize Automation limit on the number of resource-intensive (typically lengthy)
provisioning activities that can be executed concurrently. By default this is eight. Concurrent activities
beyond the configured limit are queued.
n
Any limit within the virtualization platform or cloud service account on the number of
vRealize Automation work items (resource-intensive or not) that can be executed concurrently. For
example, the default limit in vCenter Server is four, with work items beyond this limit being queued.
By default, vRealize Automation limits concurrent virtual provisioning activities for hypervisors that use
proxy agents to eight per endpoint. This ensures that the virtualization platform managed by a particular
agent never receives enough resource-intensive work items to prevent execution of other items. Plan to
carefully test the effects of changing the limit before making any changes. Determining the best limit for
your site may require that you investigate work item execution within the virtualization platform as well as
workflow activity execution within vRealize Automation.
Managing vRealize Automation
VMware, Inc. 37