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148 lines
4.2 KiB
Groff
148 lines
4.2 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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When called with only a single argument without a leading \-, runs in a hotplug
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mode, and expects the environment variable DEVPATH to specify the
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corresponding sysfs device. See section below on 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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.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 \-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.
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This mode is used when run via the \fBudev\fP PROGRAM key. Passing any
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arguments or options as part of the PROGRAM rule breaks this assumption,
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and the results will likely not be as expected.
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When in this mode, all errors and warnings are sent via 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", 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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