NAME

       /proc/scsi/ - SCSI

DESCRIPTION

       /proc/scsi/
              A  directory  with the scsi mid-level pseudo-file and various SCSI low-level driver
              directories, which contain a file for each SCSI host in this system, all  of  which
              give  the  status of some part of the SCSI IO subsystem.  These files contain ASCII
              structures and are, therefore, readable with cat(1).

              You can also write to some of the files to  reconfigure  the  subsystem  or  switch
              certain features on or off.

       /proc/scsi/scsi
              This  is a listing of all SCSI devices known to the kernel.  The listing is similar
              to the one seen during bootup.  scsi currently supports only the  add-single-device
              command which allows root to add a hotplugged device to the list of known devices.

              The command

                  echo 'scsi add-single-device 1 0 5 0' > /proc/scsi/scsi

              will  cause  host  scsi1  to scan on SCSI channel 0 for a device on ID 5 LUN 0.  If
              there is already a device known on this address or the address is invalid, an error
              will be returned.

       /proc/scsi/drivername/
              drivername   can  currently  be  NCR53c7xx,  aha152x,  aha1542,  aha1740,  aic7xxx,
              buslogic, eata_dma, eata_pio, fdomain, in2000, pas16, qlogic, scsi_debug,  seagate,
              t128,  u15-24f,  ultrastore,  or wd7000.  These directories show up for all drivers
              that registered at least one SCSI HBA.   Every  directory  contains  one  file  per
              registered  host.   Every host-file is named after the number the host was assigned
              during initialization.

              Reading these files will usually show driver and  host  configuration,  statistics,
              and so on.

              Writing  to  these  files allows different things on different hosts.  For example,
              with the latency and nolatency commands, root can switch on and off command latency
              measurement code in the eata_dma driver.  With the lockup and unlock commands, root
              can control bus lockups simulated by the scsi_debug driver.

SEE ALSO

       proc(5)