89 lines
2.8 KiB
Groff
89 lines
2.8 KiB
Groff
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.\" Copyright (c) 2016 Microsoft Corp.
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.\" All rights reserved.
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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 AUTHOR 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 AUTHOR 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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.\" $FreeBSD$
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.Dd October 12, 2016
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.Dt HV_VSS_DAEMON 8
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.Os
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.Sh NAME
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.Nm hv_vss_daemon
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.Nd Hyper-V Volume Shadow Copy Service Daemon
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.Sh SYNOPSIS
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.Nm
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.Op Fl dn
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.Sh DESCRIPTION
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The
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.Nm
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daemon provides the ability to freeze and thaw the file system for
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.Fx
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guest partitions running on Hyper-V.
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.Pp
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Hyper-V allows administrators to backup or restore the
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.Fx
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guest partition.
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Administrators can
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use Windows Powershell scripts to backup or restore the
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.Fx
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VM.
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.Pp
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The
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.Nm
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accepts file system freeze and thaw requests from the
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.Xr hv_utils 4
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driver and performs the actual file-system operation.
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.Pp
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The file system freeze and thaw functionality is
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useful when the Hyper-V host wants to do live backup of
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.Fx
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guest. Hyper-V host sends file system freezing request to
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.Nm
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which conducts the real operation. After successfully freezing file
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system, Hyper-V host takes a snapshot of the VM. In the future,
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Hyper-V host can restore the
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.Fx
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VM through that snapshot.
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.Pp
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The options are as follows:
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.Bl -tag -width indent
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.It Fl d
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Run as regular process instead of a daemon for debugging purpose.
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.It Fl n
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Generate debugging output.
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.El
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.Sh SEE ALSO
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.Xr hv_vmbus 4 ,
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.Xr hv_utils 4 ,
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.Xr hv_netvsc 4 ,
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.Xr hv_storvsc 4 ,
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.Xr hv_kvp 4
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.Sh HISTORY
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The daemon was introduced in October 2016 and developed by Microsoft Corp.
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.Sh AUTHORS
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.An -nosplit
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.Fx
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support for
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.Nm
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was first added by
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.An Microsoft BSD Integration Services Team Aq Mt bsdic@microsoft.com .
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