The Dashboard gives an overall view of the Search Appliance's status, and will update every 10 seconds.
Total Document Usage - Shows the total number of docs used across
  all profiles.Searches / minute - Shows how many searches have occurred in the
  last minute.RAM Used - Shows how much of the machine's RAM is currently in use,
  not including caches.Disk Used - Shows how much of the data partition is in use, where
  profiles are stored.  This is separate from the log partition.Maintenance - Shows the maintenance status of this the  Search Appliance.
  Lapsed maintenance can be renewed by contacting Thunderstone.Running tasks - Shows any currently running background tasks,
  including walks.
Graphs (updated every 10 minutes):
Search Rate - Graphs the recent average Search Rate.Fetch Rate - Graphs the recent average Fetch Rate, which includes
  crawls as well as meta search and system related fetches.Running Profiles - Graphs the number of profiles running crawls.
  Many profiles running at the same time may slow the system.Load Average - Graphs the recent Load Average, which is represents
  overall how "busy" the  Search Appliance is.  Higher numbers can lead to slower
  response times to searches.RAM Usage - Graphs the recent ram usage, not including caches.Network Activity - Graphs the recent bytes sent and
  received per minute by the  Search Appliance.Disk Activity - Graphs the recent bytes read and written per second
  by the  Search Appliance.Disk Usage - Graphs the recent percent disk usage
  by the  Search Appliance, which can be used to spot when disks are nearing capacity.Document Usage - Graphs the recent document usage
  by the  Search Appliance across all profiles.  This can be used to spot when
  the  Search Appliance is nearing capacity.Document Growth - Graphs the recent increases in document usage.
It will not show decreases in document usage.  This can provide a more precise
view into document usage growth particularly when document usage is already high.