ses man page on OpenBSD

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SES(4)			  OpenBSD Programmer's Manual			SES(4)

     ses - SCSI Enclosure Services

     ses* at scsibus?

     The ses driver provides support for monitoring the various environmental
     sensors present in SCSI enclosures using the SCSI Enclosure Services
     command set.  The hardware monitoring is accessed via the hw.sensors
     sysctl(8) variable.

     SCSI devices have a fairly high level interface to the system and talk to
     it via a SCSI host adapter (e.g. ahc(4)).	A SCSI adapter must also be
     separately configured into the system before a SCSI enclosure can be

     When the SCSI adapter is probed during boot, the SCSI bus is scanned for
     devices.  Any SCSI-2 devices of type ``Enclosure service'' or SCSI-3
     devices of type ``Processor'' will be attached to the ses driver.

     SES compliant devices can provide an arbitrary set of sensors which may
     include the following types:

	   Sensor    Units    Typical Use
	   temp	     uK	      temperature
	   fan	     RPM      fan
	   psu	     On/Off   power supply
	   doorlock  On/Off   door lock
	   alarm     On/Off   enclosure alarm

     Sensor data is updated every 10 seconds.

     An enclosure may provide environmental information using an alternative
     command set to the SCSI Enclosure Services used by this driver.
     Enclosures using the SCSI Accessed Fault-Tolerant Enclosure command set
     may be monitored by the safte(4) driver.

     intro(4), safte(4), scsibus(4), sensorsd(8), sysctl(8)

     The ses driver first appeared in OpenBSD 3.8.

     The ses driver was written by David Gwynne <>.

OpenBSD 4.9			March 22, 2010			   OpenBSD 4.9

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