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07544a93d6
Changes to scsi_id to support the udev %N and %p substitutions: - Update version from .7 to .8 - change TMP_DIR back to /tmp - if DEVPATH is set assume hotplug_mode (use syslog for logging, and does not output some warnings) - Always output a newline after the id is printed - Allow command line options to override settings when hotplug_mode is set - update man page - update generator script to use the %N and %p substitutions.
154 lines
4.4 KiB
Groff
154 lines
4.4 KiB
Groff
.TH SCSI_ID 8 "December 2003" "" "Linux Administrator's Manual"
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.SH NAME
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scsi_id \- retrieve and generate a unique SCSI identifier
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.SH SYNOPSIS
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.BI scsi_id
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[\fIoptions\fP]
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.SH "DESCRIPTION"
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.B scsi_id
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queries a SCSI device via the SCSI INQUIRY vital product data (VPD) page 0x80 or
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0x83 and uses the resulting data to generate a value that is unique across
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all SCSI devices that properly support page 0x80 or page 0x83.
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If a result is generated it is sent to standard output, and the program
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exits with a zero value. If no identifier is output, the program exits
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with a non\-zero value.
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\fBscsi_id\fP is primarily for use by other utilities such as \fBudev\fP
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that require a unique SCSI identifier.
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By default all devices are assume black listed, the \fB\-g\fP option must
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be specified on the command line or in the config file for any useful
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behaviour.
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SCSI commands are sent directly to the device via the SG_IO ioctl
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interface.
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In order to generate unique values for either page 0x80 or page 0x83, the
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serial numbers or world wide names are prefixed as follows.
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Identifiers based on page 0x80 are prefixed by the character 'S', the SCSI
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vendor, the SCSI product (model) and then the the serial number returned
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by page 0x80. For example:
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.sp
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.nf
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# scsi_id -p 0x80 -s /block/sdg
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SIBM 3542 1T05078453
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.fi
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.P
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Identifiers based on page 0x83 are prefixed by the identifier type
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followed by the page 0x83 identifier. For example, a device with a NAA
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(Name Address Authority) type of 3 (also in this case the page 0x83
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identifier starts with the NAA value of 6):
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.sp
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.nf
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# /sbin/scsi_id -p 0x83 -s /block/sdg
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3600a0b80000b174b000000d63efc5c8c
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.fi
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.P
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.SH OPTIONS
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.TP
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.BI subsystem
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Deprecated method: when called with only a single argument without a
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leading \-, runs in a hotplug mode, and expects the environment variable
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DEVPATH to specify the corresponding sysfs device. See section below on
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usage with \fBudev\fP.
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.TP
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.BI \-b
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The default behaviour \- treat the device as black listed, and do nothing
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unless a white listed device is found in the scsi_id config\-file.
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.TP
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.BI \-d "\| device\^"
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Instead
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of determining and creating a device node based on a sysfs dev
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entry as done for the \fB\-s\fP, send SG_IO commands to
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\fBdevice\fP, such as \fB/dev/sdc\fP.
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This argument should also be used when invoked via udev to avoid problems
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with creation of temporary files on not-yet writable directories.
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.TP
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.BI \-f "\| config\-file"
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Read configuration and black/white list entries from
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.B config\-file
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rather than the default
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.B /etc/scsi_id.config
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file.
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.TP
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.BI \-g
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Treat the device as white listed. The \fB\-g\fP option must be specified
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on the command line or in the scsi_id configuration file for
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.B scsi_id
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to generate any output.
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.TP
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.BI \-i
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Prefix the identification string with the driver model (sysfs) bus id of
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the SCSI device.
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.TP
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.BI \-p "\| 0x80 | 0x83"
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Use SCSI INQUIRY VPD page code 0x80 or 0x83. The default behaviour is to
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query the available VPD pages, and use page 0x83 if found, else page 0x80
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if found, else nothing.
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.TP
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.BI \-s "\| sysfs\-device"
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Generate an id for the
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.B sysfs\-device.
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The sysfs mount point must not be included. For example, use /block/sd,
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not /sys/block/sd.
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.TP
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.BI \-u
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Reformat the output : replace all whitespaces by underscores
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.TP
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.BI \-v
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Generate verbose debugging output.
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.TP
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.BI \-V
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Display version number and exit.
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.RE
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.SH USAGE WITH UDEV
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If \fBscsi_id\fP is invoked with one argument without a leading \-, it
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assumes it is called for a hotplug event, and looks for the sysfs device
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in the DEVPATH environment variable. This mode is deprecated, but
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available for backwards compatibility.
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If the DEVPATH environment variable is set, scsi_id assumes it has been
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invoked via udev (or some other hotplug program), and all errors or
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warnings are sent using syslog.
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To determine the specific value needed in a RESULT key, use the \-s option,
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for example:
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.sp
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.nf
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/sbin/scsi_id -s /block/sda
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.fi
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.P
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An example \fBudev\fP rule using \fBscsi_id\fP, that will name a block
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device and any partitions for the device matching the \fBscsi_id\fP output
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of 312345:
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.sp
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.nf
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BUS="scsi", PROGRAM="/sbin/scsi_id -d %N -s %p", RESULT="312345", NAME="disk%n"
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.fi
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.P
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.SH "FILES"
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.nf
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.ft B
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.ft
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/etc/scsi_id.config configuration and black/white list entries
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.fi
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.LP
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.SH "SEE ALSO"
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.BR udev (8), hotplug (8)
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.SH AUTHORS
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Developed by Patrick Mansfield <patmans@us.ibm.com> based on SCSI ID
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source included in earlier linux 2.5 kernels, sg_utils source, and SCSI
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specifications.
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