# proc_scsi - SCSI - man(5) - [phpMan]

[_proc_scsi_(5)](https://www.chedong.com/phpMan.php/man/procscsi/5/markdown)                             File Formats Manual                            [_proc_scsi_(5)](https://www.chedong.com/phpMan.php/man/procscsi/5/markdown)

## NAME
       /proc/scsi/ - SCSI

## DESCRIPTION
       _/proc/scsi/_
              A  directory with the _scsi_ mid-level pseudo-file and various SCSI low-level driver di‐
              rectories, 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 struc‐
              tures and are, therefore, readable with [**cat**(1)](https://www.chedong.com/phpMan.php/man/cat/1/markdown).

              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_ com‐
              mand 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 regis‐
              tered 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 mea‐
              surement 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)](https://www.chedong.com/phpMan.php/man/proc/5/markdown)

Linux man-pages 6.7                          2023-08-15                                 [_proc_scsi_(5)](https://www.chedong.com/phpMan.php/man/procscsi/5/markdown)