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ses.4freebsd

Langue: en

Version: 300668 (debian - 07/07/09)

Section: 4 (Pilotes et protocoles réseau)


BSD mandoc

NAME

ses - SCSI Environmental Services driver

SYNOPSIS

device ses

DESCRIPTION

The 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.

KERNEL CONFIGURATION

It is only necessary to explicitly configure one 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 driver to perform functions on devices of other classes that claim to also support functionality.

IOCTLS

The following ioctl(2) calls apply to devices. They are defined in the header file In cam/scsi/scsi_ses.h (q.v.).
SESIOC_GETNOBJ
Used to find out how many objects are driven by this particular device instance.
SESIOC_GETOBJMAP
Read, from the kernel, an array of SES objects which contains the object identifier, which subenclosure it is in, and the type of the object.
SESIOC_GETENCSTAT
Get the overall enclosure status.
SESIOC_SETENCSTAT
Set the overall enclosure status.
SESIOC_GETOBJSTAT
Get the status of a particular object.
SESIOC_SETOBJSTAT
Set the status of a particular object.
SESIOC_GETTEXT
Get the associated help text for an object (not yet implemented). devices often have descriptive text for an object which can tell you things like location (e.g, "left power supply").
SESIOC_INIT
Initialize the enclosure.

EXAMPLE USAGE

The files contained in In usr/share/examples/ses show simple mechanisms for how to use these interfaces, as well as a very stupid simple monitoring daemon.

FILES

/dev/ses N
The Nth SES device.

DIAGNOSTICS

When the kernel is configured with DEBUG enabled, the first open to an SES device will spit out overall enclosure parameters to the console.

HISTORY

The driver was written for the CAM SCSI subsystem by Matthew Jacob. This is a functional equivalent of a similar driver available in Solaris, Release 7.
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