ses —
SCSI
Environmental Services driver
device ses
The
ses driver provides support for all SCSI
devices of the environmental services class that are attached to the system
through a supported SCSI Host Adapter, as well as emulated support for SAF-TE
(SCSI Accessible Fault Tolerant Enclosures). The environmental services class
generally are enclosure devices that provide environmental information such as
number of power supplies (and state), temperature, device slots, and so on.
A SCSI Host adapter must also be separately configured into the system before a
SCSI Environmental Services device can be configured.
It is only necessary to explicitly configure one
ses device; data structures are dynamically
allocated as devices are found on the SCSI bus.
A separate option,
SES_ENABLE_PASSTHROUGH, may
be specified to allow the
ses driver to perform
functions on devices of other classes that claim to also support
ses functionality.
The following
ioctl(2) calls apply to
ses devices. They are defined in the header file
<cam/scsi/scsi_enc.h>
(
q.v.).
ENCIOC_GETNELM- Used to find out how many ses
elements are driven by this particular device instance.
ENCIOC_GETELMMAP- Read, from the kernel, an array of SES elements which
contains the element identifier, which subenclosure it is in, and the
ses type of the element.
ENCIOC_GETENCSTAT- Get the overall enclosure status.
ENCIOC_SETENCSTAT- Set the overall enclosure status.
ENCIOC_GETELMSTAT- Get the status of a particular element.
ENCIOC_SETELMSTAT- Set the status of a particular element.
ENCIOC_GETTEXT- Get the associated help text for an element (not yet
implemented). ses devices often have
descriptive text for an element which can tell you things like location
(e.g., "left power supply").
ENCIOC_INIT- Initialize the enclosure.
ENCIOC_GETELMDESC- Get the element's descriptor string.
ENCIOC_GETELMDEVNAMES- Get the device names, if any, associated with this
element.
ENCIOC_GETSTRING- Used to read the SES String In Diagnostic Page. The
contents of this page are device-specific.
ENCIOC_SETSTRING- Used to set the SES String Out Diagnostic Page. The
contents of this page are device-specific.
ENCIOC_GETENCNAME- Used to get the name of the enclosure.
ENCIOC_GETENCID- Used to get the Enclosure Logical Identifier.
The files contained in
</usr/share/examples/ses>
show simple mechanisms for how to use these interfaces, as well as a very
stupid simple monitoring daemon.
-
/dev/sesN
- The Nth
SES device.
When the kernel is configured with DEBUG enabled, the first open to an SES
device will spit out overall enclosure parameters to the console.
sesutil(8)
The
ses driver was originally written for the CAM
SCSI subsystem by Matthew Jacob and first released in
FreeBSD
4.3. It was a functional equivalent of a similar driver available in
Solaris, Release 7. It was largely rewritten by Alexander Motin, Justin Gibbs,
and Will Andrews for
FreeBSD 9.2.