- fan status
- slot status (populated/empty)
- door status
- power supplies
- indicators (e.g. LEDs, LCDs)
Practically, any given SAF-TE device will only support a subset of all possible sensors or controls.
Many RAID controllers can utilize a SAF-TE 'activated' backplane by detecting a swapped drive (after a defect) and automatically starting a rebuild. A passive subsystem usually requires a manual rescan and rebuild.
A SAF-TE device is represented as a SCSI processor device that is polled every couple of seconds by e.g. the RAID controller software. Due to the low overhead required, impact on bus performance is negligible. For SAS or Fibre Channel systems, SAF-TE is replaced by the more standardized SCSI Enclosure Services.
The most widely used version was defined in 'SAF-TE Interface Specification Intermediate Review R041497 April 14, 1997' by nStor (now Xyratex) and Intel.