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This commit is based on the s390-tools-1.39.0 version. Changes on top of s390-tools-1.39.0: - Add MIT license to all source files - Add LICENSE file - Transform REAMDE to README.md (markdown) - Add AUTHORS.md file - Add CONTRIBUTING.md file - Move changelog from README to CHANGELOG.md file Reviewed-by: Stefan Haberland <sth@linux.vnet.ibm.com> Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
136 lines
3.7 KiB
Groff
136 lines
3.7 KiB
Groff
.\" Copyright 2017 IBM Corp.
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.\" s390-tools is free software; you can redistribute it and/or modify
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.\" it under the terms of the MIT license. See LICENSE for details.
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.\"
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.TH CHCCWDEV 8 "Apr 2006" "s390-tools"
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.SH NAME
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chccwdev \- modify generic attributes of channel attached devices.
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.SH SYNOPSIS
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.TP 9
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.B chccwdev
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.B -h
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.TP
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.B chccwdev
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.RB "[ (" -a
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.IB <name> = <value>
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.RB "| " -e " | " -d " | " -s " | " -f ") [...]]"
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.br
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.I <range>
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.RI "[, " "<range>" " [...]]"
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.TP
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.B chccwdev
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.B -v
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.SH DESCRIPTION
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The chccwdev command is used to set generic attributes for devices that
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are controlled by the common I/O subsystem. Attributes are set in the order
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they are specified on the commandline except the online attribute which is
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special.
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.P
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If the same attribute is given more than one time the value that was set
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last will be used. This is also true (while not that obvious) when mixing
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the generic
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.BR -a " and the " -e ", " -d ", "-s" and " -f " arguments."
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.P
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All attributes will be set in the following order:
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.RS
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.TP 4
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1.
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All attributes except online. If the device is offline there will be no
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error if the attribute doesn't exist.
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.TP
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2.
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Set the online attribute to the desired value ((forced) online or
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(safe) offline).
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.TP
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3.
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Set all the attributes that havn't been set, yet. At this point invalid
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attribute names will always cause an error.
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.RE
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.P
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If any error occurs the execution is terminated. So if using ranges only
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devices before the current one have been modified. There is no automatic
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rollback. All attributes that already have been changed will stay that way.
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.SH OPTIONS
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.TP 8
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.BR -h | --help
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Print help text.
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.TP 8
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.BR -v | --version
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Print the version of the s390-tools package and the command.
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.TP
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.BR -a | --attribute " \fI<name>\fR=\fI<value>\fR"
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Try to set the attribute named \fIname\fR to the given value. After writing
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the attribute it will be read to check whether the setting was accepted.
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.TP
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.BR -e | --online
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Try to set the specified devices online.
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.TP
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.BR -f | --forceonline
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Same as online but for devices that support this (DASD devices), it can
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be used to bring it online regardless of any reserved states.
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.TP
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.BR -d | --offline
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Try to set the specified devices offline. The --online, --forceonline,
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--offline, and --safeoffline options are mutually exclusive.
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.TP
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.BR -s |--safeoffline
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DASD only: For each specified device, wait until all outstanding I/O
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requests have completed, and then try to set the device offline. The
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--online, --forceonline, --offline, and --safeoffline options are
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mutually exclusive.
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.TP
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\fB<range>\fR = <bus ID>\fB[-\fR<bus ID>\fB]\fR
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.TP
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\fB<bus ID>\fR = ([0-9]+\\.[0-9]+\\.)?[0-9a-f]{1,4}
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Note that bus IDs specified in short form (i.e. without leading "0.<n>.")
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will be interpreted as "0.0.<bus ID>".
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Example: "0192" becomes "0.0.0192".
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.SH EXAMPLES
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\fBchccwdev --online 0.0.0192,0.0.0195-0.0.0198\fR
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.RS
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After completing all outstanding I/O requests for the devices with bus
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ID 0.0.0192, 0.0.0195, 0.0.0196, 0.0.0197 and 0.0.0198, tries to set
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the device offline.
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.RE
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.P
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.B chccwdev --attribute readonly=1 --attribute online=1 0.0.0192
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.RS
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This will try to set the device with bus ID 0.0.192 online with readonly
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attribute set to one (read-only mode).
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.RE
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.P
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.B chccwdev --attribute cmb_enable=1 0.0.0195-0.0.0198
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.RS
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Set the cmb_enable attribute of the devices 0.0.0195, 0.0.0196, 0.0.0197 and
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0.0.0198 to one. This would for example activate the usage of the channel
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measurement block facility.
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.RE
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.P
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.B chccwdev --safeoffline 0.0.0192,0.0.0195-0.0.0198
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.RS
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Will try to set the devices with bus ID 0.0.0192, 0.0.0195,
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0.0.0196, 0.0.0197 and 0.0.0198 offline and finish all outstanding I/O
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requests before.
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.RE
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.SH AUTHOR
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.nf
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This man-page was written by Stefan Bader <shbader@de.ibm.com>.
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.SH "SEE ALSO"
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.BR lscss (8)
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.fi
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