If you use the deployment part of SMP 7, you might have .gho files that takes up space.
We found that each time we capture a new computer, a new ghost file is created on the server. We make new captures once in a while to incorporate as many OS fixes as possible, so we ended up with a lot of unused .gho files in the system. Each .gho file is somewhere between 5GB and 10GB.
You can find out how many .gho files you have on the server, by looking in \Program Files\Altiris\Altiris Agent\Agents\Deployment\Task Handler\image. This folder contains folders named with a GUID.
To find the .gho resource links in SMP, go to Manage->All Resources->Software Component->Image Resource. If the resources is not used in any jobs/tasks, they can be removed from SMP by right clicking->Delete.
Deleting the resource does not remove the .gho file, so before deleting any resource, open the resource manager, and view Inventory for the .gho resource. In Data Classes->Software Management->Image Resource Component, the path to the .gho is displayed. Note which .gho folder to delete before deleting the SMP resource.
We have not found any thing not working after deleting .gho files and resources this way.