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Remove /^\.\\"\n\.\\"\s*\$FreeBSD\$$\n/
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Groff
.\" Copyright (c) 2010 The FreeBSD Foundation
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.\" All rights reserved.
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.\"
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.\" This software was developed by Pawel Jakub Dawidek under sponsorship from
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.\" the FreeBSD Foundation.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.Dd September 8, 2016
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.Dt HASTCTL 8
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.Os
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.Sh NAME
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.Nm hastctl
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.Nd "Highly Available Storage control utility"
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.Sh SYNOPSIS
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.Nm
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.Cm create
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.Op Fl d
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.Op Fl c Ar config
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.Op Fl e Ar extentsize
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.Op Fl k Ar keepdirty
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.Op Fl m Ar mediasize
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.Ar name ...
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.Nm
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.Cm role
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.Op Fl d
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.Op Fl c Ar config
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.Aq init | primary | secondary
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.Ar all | name ...
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.Nm
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.Cm list
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.Op Fl d
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.Op Fl c Ar config
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.Op Ar all | name ...
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.Nm
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.Cm status
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.Op Fl d
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.Op Fl c Ar config
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.Op Ar all | name ...
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.Nm
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.Cm dump
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.Op Fl d
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.Op Fl c Ar config
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.Op Ar all | name ...
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.Sh DESCRIPTION
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The
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.Nm
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utility is used to control the behaviour of the
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.Xr hastd 8
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daemon.
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.Pp
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This utility should be used by HA software like
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.Nm heartbeat
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or
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.Nm ucarp
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to setup HAST resources role when changing from primary mode to
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secondary or vice versa.
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Be aware that if a file system like UFS exists on HAST provider and
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primary node dies, file system has to be checked for inconsistencies
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with the
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.Xr fsck 8
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utility after switching secondary node to primary role.
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.Pp
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The first argument to
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.Nm
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indicates an action to be performed:
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.Bl -tag -width ".Cm create"
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.It Cm create
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Initialize local provider configured for the given resource.
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Additional options include:
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.Bl -tag -width ".Fl e Ar extentsize"
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.It Fl e Ar extentsize
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Size of an extent.
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Extent is a block which is used for synchronization.
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.Xr hastd 8
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maintains a map of dirty extents and extent is the smallest region that
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can be marked as dirty.
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If any part of an extent is modified, entire extent will be synchronized
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when nodes connect.
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If extent size is too small, there will be too much disk activity
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related to dirty map updates, which will degrade performance of the
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given resource.
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If extent size is too large, synchronization, even in case of short
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outage, can take a long time increasing the risk of losing up-to-date
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node before synchronization process is completed.
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The default extent size is
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.Va 2MB .
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.It Fl k Ar keepdirty
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Maximum number of dirty extents to keep dirty all the time.
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Most recently used extents are kept dirty to reduce number of metadata
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updates.
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The default number of most recently used extents which will be kept
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dirty is
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.Va 64 .
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.It Fl m Ar mediasize
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Size of the smaller provider used as backend storage on both nodes.
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This option can be omitted if node providers have the same size on both
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sides.
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.El
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.Pp
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If size is suffixed with a k, M, G or T, it is taken as a kilobyte,
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megabyte, gigabyte or terabyte measurement respectively.
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.It Cm role
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Change role of the given resource.
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The role can be one of:
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.Bl -tag -width ".Cm secondary"
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.It Cm init
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Resource is turned off.
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.It Cm primary
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Local
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.Xr hastd 8
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daemon will act as primary node for the given resource.
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System on which resource role is set to primary can use
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.Pa /dev/hast/<name>
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GEOM provider.
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.It Cm secondary
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Local
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.Xr hastd 8
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daemon will act as secondary node for the given resource - it will wait
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for connection from the primary node and will handle I/O requests
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received from it.
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GEOM provider
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.Pa /dev/hast/<name>
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will not be created on secondary node.
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.El
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.It Cm list
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Present verbose status of the configured resources.
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.It Cm status
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Present terse (and more easy machine-parseable) status of the configured
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resources.
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.It Cm dump
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Dump metadata stored on local component for the configured resources.
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.El
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.Pp
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In addition, every subcommand can be followed by the following options:
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.Bl -tag -width ".Fl c Ar config"
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.It Fl c Ar config
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Specify alternative location of the configuration file.
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The default location is
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.Pa /etc/hast.conf .
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.It Fl d
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Print debugging information.
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This option can be specified multiple times to raise the verbosity
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level.
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.El
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.Sh FILES
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.Bl -tag -width ".Pa /var/run/hastctl" -compact
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.It Pa /etc/hast.conf
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Configuration file for
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.Nm
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and
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.Xr hastd 8 .
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.It Pa /var/run/hastctl
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Control socket used by
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.Nm
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to communicate with the
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.Xr hastd 8
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daemon.
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.El
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.Sh EXIT STATUS
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Exit status is 0 on success, or one of the values described in
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.Xr sysexits 3
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on failure.
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.Sh EXAMPLES
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Initialize HAST provider, create file system on it and mount it.
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.Bd -literal -offset indent
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nodeB# hastctl create shared
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nodeB# hastd
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nodeB# hastctl role secondary shared
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nodeA# hastctl create shared
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nodeA# hastd
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nodeA# hastctl role primary shared
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nodeA# newfs -U /dev/hast/shared
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nodeA# mount -o noatime /dev/hast/shared /shared
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nodeA# application_start
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.Ed
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.Pp
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Switch roles for the
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.Nm shared
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HAST resource.
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.Bd -literal -offset indent
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nodeA# application_stop
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nodeA# umount -f /shared
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nodeA# hastctl role secondary shared
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nodeB# hastctl role primary shared
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nodeB# fsck -t ufs /dev/hast/shared
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nodeB# mount -o noatime /dev/hast/shared /shared
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nodeB# application_start
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.Ed
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.Sh SEE ALSO
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.Xr sysexits 3 ,
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.Xr geom 4 ,
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.Xr hast.conf 5 ,
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.Xr fsck 8 ,
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.Xr ggatec 8 ,
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.Xr ggatel 8 ,
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.Xr hastd 8 ,
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.Xr mount 8 ,
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.Xr newfs 8
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.Sh HISTORY
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The
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.Nm
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utility appeared in
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.Fx 8.1 .
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.Sh AUTHORS
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The
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.Nm
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was developed by
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.An Pawel Jakub Dawidek Aq Mt pjd@FreeBSD.org
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under sponsorship of the FreeBSD Foundation.
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