Timeslots can be reserved successfully only when all the requested resources are available for the requested duration of time.
Many factors render a timeslot invalid. Such factors include:
Changes to the Performance Center licenses (this does not affect maintenance timeslots)
Resources become unavailable
A test linked to a timeslot becomes invalid
In some cases, such as where there is a conflict between hosts, the system can perform a reshuffle of hosts to try to rectify the situation and revalidate the timeslot. For details, see Host allocation. Other factors, such as test invalidation, can be corrected manually.
Tip: You can configure the system to alert you by email when a timeslot becomes invalid. The alert provides details about the cause of the failure. For details on configuring timeslot alerts, refer to the ALM Lab Management Guide