The FileManger service of the LCLS Metadata Manager (eLog)  shows user the data files of an experiment and allows to restore runs that were purged from disk.

File-Manager UI

Status/Restore Files

The colored buttons under the Location header allow to query the status of a file and restore a runs to tape. The color codes are shown above how ever they might not always be right in particular files  shown to be on disk (blue) might have been removed from disk. The Update   is used to query the status will open a window like:

It will show the status: number of files, files missing and files in restore queue (not shown in this example). If files are missing the restore is requested clicking the Restore files button.

The Restore button would submit a request directly but only for missing files.