NetBSD/usr.sbin/fssconfig/fssconfig.8

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.\" $NetBSD: fssconfig.8,v 1.4 2004/05/25 14:55:47 hannken Exp $ */
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.\"
.\" Copyright (c) 2003 The NetBSD Foundation, Inc.
.\" All rights reserved.
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.\" This code is derived from software contributed to The NetBSD Foundation
.\" by Juergen Hannken-Illjes.
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.Dd May 25, 2004
.Dt FSSCONFIG 8
.Os
.Sh NAME
.Nm fssconfig
.Nd configure file system snapshot devices
.Sh SYNOPSIS
.Nm
.Op Fl cxv
.Ar device
.Ar path
.Ar backup
.Op Ar cluster Op Ar size
.Nm
.Fl u Op Fl v
.Ar device
.Nm
.Fl l Op Fl v
.Op Ar device
.Sh DESCRIPTION
The
.Nm
command configures file system snapshot pseudo disk devices.
It will associate the file system snapshot disk
.Ar device
with a snapshot of
.Ar path
allowing the latter to be accessed as though it were a disk.
Data written through the
.Ar path
will be saved in
.Ar backup
which must not reside on the snapshotted file system.
If
.Ar backup
is a regular file, it will be created with length
.Ar size .
Default size is the size of
.Ar path .
Data is saved to
.Ar backup
in units of
.Ar cluster
bytes.
.Pp
Options indicate an action to be performed:
.Bl -tag -width 3n
.It Fl c
Configures the device.
If successful, references to
.Ar device
will access the contents of
.Ar path
at the time the snapshot was taken.
If
.Ar backup
is a directory, a temporary file will be created in this directory.
This file will be unlinked on exit.
.It Fl l
List the snapshot devices and indicate which ones are in use.
If a specific
.Ar device
is given, then only that will be described.
.It Fl u
Unconfigures the
.Ar device .
.It Fl v
Be more verbose listing the snapshot devices.
.It Fl x
Unlink
.Ar backup
after the
.Ar device
is configured.
.El
.Pp
If no action option is given,
.Fl c
is assumed.
.Sh FILES
.Bl -tag -width /etc/disktab -compact
.It Pa /dev/rfss?
.It Pa /dev/fss?
.El
.Sh EXAMPLES
.Dl fssconfig fss0 /usr /tmp/back
.Pp
Configures the snapshot device
.Pa fss0
for a snapshot of the
.Pa /usr
file system.
Data written through
.Pa /usr
will be backed up in
.Pa /tmp/back .
.Pp
.Dl fssconfig fss1 / /dev/rsd0e 8192
.Pp
Configures the snapshot device
.Pa fss1
for a snapshot of the
.Pa /
file system.
Data written through
.Pa /
will be backed up in
.Pa /dev/rsd0e .
The backup will take place in units of 8192 bytes.
.Pp
.Dl fssconfig -u fss0
.Pp
Unconfigures the
.Pa fss0
device.
.Sh SEE ALSO
.Xr opendisk 3 ,
.Xr fss 4 ,
.Xr mount 8 ,
.Xr umount 8
.Sh HISTORY
The
.Nm
command appeared in
.Nx 2.0 .
.Sh BUGS
The
.Xr fss 4
driver is
.Em experimental .
Be sure you have a backup before you use it.