lsscsi(8)							      LSSCSI								 lsscsi(8)

NAME

       lsscsi - list SCSI devices (or hosts) and their attributes

SYNOPSIS

       lsscsi  [--classic]  [--device]	[--generic] [--help] [--hosts] [--kname] [--list] [--long] [--protection] [--sysfsroot=PATH] [--transport]
       [--verbose] [--version] [H:C:T:L]

DESCRIPTION

       Uses information in sysfs (linux kernel series 2.6 and later) to list scsi devices (or hosts) currently attached to the system. Options can
       be used to control the amount and form of information provided for each device.

       If a H:C:T:L argument is given then it acts as a filter and only devices that match it are listed. The colons don't have to be present, and
       '-', '*', '?' or missing arguments at the end are interpreted as wildcards. '-' needs to stand alone or else it is taken as  the  beginning
       of  an  option  (e.g.  '-:-:-:-'  is  illegal).	'*' needs to be escaped from the shell. A leading '[' and trailing ']' are permitted (e.g.
       '[1:0:0]' matches all luns on 1:0:0). May also be used to filter --hosts in which case only the H is active and may be either a	number	or
       in the form "host<n>" where <n> is a host number.

       By  default  in this utility device node names (e.g. "/dev/sda" or "/dev/root_disk") are obtained by noting the major and minor numbers for
       the listed device obtained from sysfs (e.g. the contents of "/sys/block/sda/dev") and then looking for a match  in  the	"/dev"	directory.
       This  "match by major and minor" will allow devices that have been given a different name by udev (for example) to be correctly reported by
       this utility.

       In some situations it may be useful to see the device node name that linux would produce by default, so the --kname option is provided.	An
       example of where this may be useful is kernel error logs which tend to report disk error messages using the disk's default kernel name.

       Information about this utility including examples can also be found at: http://sg.danny.cz/scsi/lsscsi.html .

OPTIONS

       -c, --classic
	      The output is similar to that obtained from 'cat /proc/scsi/scsi'

       -d, --device
	      After  outputting  the  (probable)  scsi	device	name  the  device  node  major	and  minor  numbers  are  shown  in brackets (e.g.
	      "/dev/sda[8:0]").

       -g, --generic
	      Output the scsi generic device file name. Note that if the sg driver is a module it may need to be loaded otherwise '-' may appear.

       -h, --help
	      Output the usage message and exit.

       -H, --hosts
	      List the SCSI hosts currently attached to the system. If this option is not given then SCSI devices are listed.

       -k, --kname
	      Use linux default algorithm for naming devices (e.g. block major 8, minor 0 is "/dev/sda") rather  than  the  "match  by	major  and
	      minor" in the "/dev" directory as discussed above.

       -L, --list
	      Output  additional information in <attribute_name>=<value> pairs, one pair per line preceded by two spaces. This option has the same
	      effect as '-lll'

       -l, --long
	      Output additional information for each SCSI device (host). Can be used multiple times for more output  in  which	case  the  shorter
	      option  form  is	more  convenient  (e.g. '-lll'). When used three times (i.e. '-lll') outputs SCSI device (host) attributes one per
	      line; preceded by two spaces; in the form "<attribute_name>=<value>".

       -p, --protection
	      Output additional data integrity (protection) information.

       -t, --transport
	      Output transport information. This will be a target related information or, if --hosts is given, initiator related information. When
	      used  without  --list,  a  name  or identifier (or both) are output on a single line, usually prefixed by the type of transport. For
	      devices this information replaces the normal vendor, product and revision strings. When the --list option is also given  then  addi-
	      tionally multiple lines of attribute_name=value pairs are ouput, each indented by two spaces. See the section on transports below.

       -v, --verbose
	      outputs directory names where information is found. Use multiple times for more output.

       -V, --version
	      outputs version information then exits.

       -y, --sysfsroot=PATH
	      assumes sysfs is mounted at PATH instead of the default '/sys' . If this option is given PATH should be an absolute path (i.e. start
	      with '/').

NOTES

       Information for this command is derived from the sysfs file system, which is assumed to be mounted at /sys unless  specified  otherwise	by
       the  user.   SCSI  (pseudo)  devices  that have been detected by the SCSI mid level will be listed even if the required upper level drivers
       (i.e. sd, sr, st, osst or ch) have not been loaded. If the appropriate upper level driver has not been loaded then  the	device	file  name
       will  appear as '-' rather than something like '/dev/st0'. Note that some devices (e.g. scanners and medium changers) do not have a primary
       upper level driver and can only be accessed via a scsi generic (sg) device name.

       lsscsi version 0.21 or later is required to correctly display SCSI devices in linux kernel  2.6.26  (and  possibly  later)  when  the  CON-
       FIG_SYSFS_DEPRECATED_V2 kernel option is not defined.

TRANSPORTS

       This  utility lists SCSI devices which are known as logical units (lu) in the SCSI Architecture Model (ref: SAM-4 at http://www.t10.org) or
       hosts when the --hosts option is given. A host is called an initiator in SAM-4. A SCSI command travels out via an  initiator,  across  some
       transport  to  a  target  and then onwards to a logical unit. A target device may contain several logical units. A target device has one or
       more ports that can be viewed as transport end points. Each FC and SAS disk is a single target that has two ports and contains one  logical
       unit.  If both target ports on a FC or SAS disk are connected and visible to a machine, then lsscsi will show two entries. Initiators (i.e.
       hosts) also have one or more ports and some HBAs in Linux have a host entry per initiator port while others have a host entry per initiator
       device.

       When  the  --transport  option is given for devices (i.e.  --hosts not given) then most of the information produced by lsscsi is associated
       with the target, or more precisely: the target port, through which SCSI commands pass that access a logical unit.

       Typically this utility provides one line of output per "device" or host.  Significantly more information can  be  obtained  by  adding  the
       --list  option. When used together with the --transport option, after the summary line, multiple lines of transport specific information in
       the form "<attribute_name>=<value>" are output, each indented by two spaces.  Using a filter argument will reduce the volume of output if a
       lot of devices or hosts are present.

       The transports that are currently recognized are: IEEE 1394, ATA, FC, iSCSI, SAS, SATA, SPI and USB.

       For  IEEE 1394 (a.k.a. Firewire and "SBP" when storage is involved), the EUI-64 based target port name is output when --transport is given,
       in the absence of the --hosts option. When the --hosts option is given then the EUI-64 initiator port name is output. Output on the summary
       line specific to the IEEE 1394 transport is prefixed by "sbp:".

       to  detect  ATA	and SATA a crude check is performed on the driver name (after the checks for other transports are exhausted). Based on the
       driver name either ATA or SATA transport type is chosen. Output on the summary line is either "ata:" or "sata:". No  other  attributes  are
       given.  Most device and hosts flagged as "ata:" will use the parallel ATA transport (PATA).

       For  Fibre  Channel (FC) the port name and port identifier are output when --transport is given. In the absence of the --hosts option these
       ids will be for the target port associated with the device (logical unit) being listed. When the --hosts option is given then the  ids  are
       for the initiator port used by the host. Output on the summary line specific to the FC transport is prefixed by "fc:".

       For iSCSI the target port name is output when --transport is given, in the absence of the --hosts option. This is made up of the iSCSI name
       and the target portal group tag. Since the iSCSI name starts with "iqn" no further prefix is used. When the --hosts option  is  given  then
       only "iscsi:" is output on the summary line.

       For  Serial  Attached SCSI the SAS address of the target port (or initiator port if --hosts option is also given) is output. This will be a
       naa-5 address. For SAS HBAs and SAS targets (such as SAS disks and tape drives) the SAS address will be world wide unique. For  SATA  disks
       attached to a SAS expander, the expander provides the SAS address by adding a non zero value to its (i.e. the expander's) SAS address (e.g.
       expander_sas_address + phy_id + 1). SATA disks directly attached to SAS HBAs seem to have an indeterminate SAS address. Output on the  sum-
       mary line specific to the SAS transport is prefixed by "sas:".

       For  the  SCSI Parallel Interface (SPI) the target port identifier (usually a number between 0 and 15 inclusive) is output when --transport
       is given, in the absence of the --hosts option. When the --hosts option is given then only "spi:" is output on the summary line.

       When a USB transport is detected, the summary line will contain "usb:" followed by a USB device name. The USB  device  name  has  the  form
       "<b>-<p1>[.<p2>[.<p3>]]:<c>.<i>"  where <b> is the USB bus number, <p1> is the port on the host. <p2> is a port on a host connected hub, if
       present.  If needed <p3> is a USB hub port closer to the USB storage device. <c> refers to the configuration number while <i> is the inter-
       face  number. There is a separate SCSI host for each USB (SCSI) target. A USB SCSI target may contain multiple logical units. Thus the same
       "usb: <device_name>" string appears for a USB SCSI host and all logical units that belong to the USB SCSI target associated with  that  USB
       SCSI host.

AUTHOR

       Written by Doug Gilbert

REPORTING BUGS

       Report bugs to <dgilbert at interlog dot com>.

COPYRIGHT

       Copyright (C) 2003-2009 Douglas Gilbert
       This  software  is distributed under the GPL version 2. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PUR-
       POSE.

SEE ALSO

       lspci lsusb

lsscsi-0.23							   November 2009							 lsscsi(8)