NAME
scsi_id - retrieve and generate a unique SCSI identifier
SYNOPSIS
scsi_id [options]
DESCRIPTION
scsi_id queries a SCSI device via the SCSI INQUIRY vital product data
(VPD) page 0x80 or 0x83 and uses the resulting data to generate a value
that is unique across all SCSI devices that properly support page 0x80
or page 0x83.
If a result is generated it is sent to standard output, and the program
exits with a zero value. If no identifier is output, the program exits
with a non-zero value.
scsi_id is primarily for use by other utilities such as udev that
require a unique SCSI identifier.
By default all devices are assumed black listed, the --whitelisted
option must be specified on the command line or in the config file for
any useful behaviour.
SCSI commands are sent directly to the device via the SG_IO ioctl
interface.
In order to generate unique values for either page 0x80 or page 0x83,
the serial numbers or world wide names are prefixed as follows.
Identifiers based on page 0x80 are prefixed by the character 'S', the
SCSI vendor, the SCSI product (model) and then the the serial number
returned by page 0x80. For example:
# /lib/udev/scsi_id --page=0x80 --whitelisted --device=/dev/sda
SIBM 3542 1T05078453
Identifiers based on page 0x83 are prefixed by the identifier type
followed by the page 0x83 identifier. For example, a device with a NAA
(Name Address Authority) type of 3 (also in this case the page 0x83
identifier starts with the NAA value of 6):
# /lib/udev/scsi_id --page=0x83 --whitelisted --device=/dev/sda
3600a0b80000b174b000000d63efc5c8c
OPTIONS
--blacklisted
The default behaviour - treat the device as black listed, and do
nothing unless a white listed device is found in the scsi_id
config-file.
--device=device
Send SG_IO commands to device, such as /dev/sdc.
--config=config-file
Read configuration and black/white list entries from config-file
rather than the default /etc/scsi_id.config file.
--whitelisted
Treat the device as white listed. The --whitelisted option must
be specified on the command line or in the scsi_id configuration
file for scsi_id to generate any output.
--page=0x80|0x83|pre-spc3-83
Use SCSI INQUIRY VPD page code 0x80, 0x83, or pre-spc3-83.
The default behaviour is to query the available VPD pages, and
use page 0x83 if found, else page 0x80 if found, else nothing.
Page pre-spc3-83 should only be utilized for those scsi devices
which are not compliant with the SPC-2 or SPC-3 format for page
83. While this option is used for older model 4, 5, and 6 EMC
Symmetrix devices, its use with SPC-2 or SPC-3 compliant devices
will fallback to the page 83 format supported by these devices.
--replace-whitespace
Reformat the output : replace all whitespaces by underscores.
--export
Export all data in KEY=<value> format used to import in other
programs.
--verbose
Generate verbose debugging output.
--version
Display version number and exit.
FILES
/etc/scsi_id.config
Configuration of black/white list entries and per device options:
# one config per line, short match strings match longer strings
# vendor=string[,model=string],options=<per-device scsi_id command line options>
vendor="ATA",options=-p 0x80
SEE ALSO
udev(7)
AUTHORS
Developed by Patrick Mansfield <patmans@us.ibm.com> based on SCSI ID
source included in earlier linux 2.5 kernels, sg_utils source, and SCSI
specifications.
December 2003