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Most users will use VCL to make basic reservations. These typically only have a duration of several hours and can only be accessed by the person that made the reservation. Cluster reservations are included in basic reservations for images that have subimages assigned to them. Some users can have extended access that allows them to make basic reservations for up to 59 days. With default settings, basic reservations that are less than 24 hours are timed out due inactivity when a user is disconnected for 15 minutes. This prevents users from making a several hour reservation, using it for only a small portion of that time, and then tying up resources the resource for the remaining amount of time when the resource is not actually being used. Users that have access to create new images can select to create a new image from a basic reservation that is not a cluster. Basic reservations can also be timed out if the user makes the reservation and never clicks the Connect button, or does click the Connect button but never actually connects to it.

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Users with access to create images can do so from basic reservations in most cases, but there are some benefits to selecting to make an imaging reservation when creating new images. Imaging reservations allow users to select 12 hours for the duration of the reservation even if they do not have access to make 12 hour basic reservations. Imaging reservations do not get timed out due to a user being disconnected. At the end of an imaging reservation, if the user has not selected to create the image, an image is automatically captured from the reservation. This prevents the work done to create the image from being lost. Finally, when making an imaging reservation for an image that has subimages assigned to it, the user only gets a reservation for the parent image. This is the only way to create and update parent images from clusters since images cannot be captured from cluster reservations. As with basic reservations, imaging reservations can be timed out if the user makes the reservation and never clicks the Connect button, or does click the Connect button but never actually connects to it.

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