If the drive where the catalog is stored starts to fill up, indexing is temporarily paused. If very little free disk space is available on the index disk (less than 3 MB), filtering will be temporarily paused, and cannot continue until more disk space is freed on the catalog drive. A message is written to the event log when the disk starts filling up. Administrators should monitor the event log for these messages and free disk space by deleting, moving, or compressing files.
To avoid a disk-full condition, follow the guidelines on the Recommended Configuration page.