The proc pseudo file system provides some useful information about
the SCSI subsystem. [The kernel configuration option is CONFIG_PROC_FS and
in almost all cases prof_fs should be built in.] SCSI specific information
is found under the directory /proc/scsi. Probably
the most commonly accessed entry is cat /proc/scsi/scsi
which lists the attached SCSI devices. See
Section 8.3 for more details.
The lower level drivers are allocated proc_fs entries of the form:
/proc/scsi/<driver_name>/<scsi_adapter_number> |
where the <driver_name> is something like "aic7xxx" or "BusLogic". The
<scsi_adapter_number> (also known as the host number) is the same number
that was discussed in the
SCSI addressing
section. Note that one driver may control one or more hosts.
What is stored in this file is lower level driver dependent (and in the
case of some adapter drivers it
is possible to set parameters via this file). When reporting problems
to newsgroups or maintainers it is useful to include the output of this
file (e.g.
cat /proc/scsi/aic7xxx/0 ).
The general information on the proc pseudo file system can be found in
the kernel source file:
/usr/src/linux/Documentation/filesystems/proc.txt.
The sg driver provides information about hosts and devices in directory
/proc/scsi/sg . See Section 9.4.3.
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