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 configured.
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
<
dlg@openbsd.org>.
![[OpenBSD]](/openbsd.gif){kind=small}