'\" t
.\"     Title: vfs_shadow_copy2
.\"    Author: [see the "AUTHOR" section]
.\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
.\"      Date: 04/11/2016
.\"    Manual: System Administration tools
.\"    Source: Samba 3.6
.\"  Language: English
.\"
.TH "VFS_SHADOW_COPY2" "8" "04/11/2016" "Samba 3\&.6" "System Administration tools"
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.SH "NAME"
vfs_shadow_copy2 \- Expose snapshots to Windows clients as shadow copies\&.
.SH "SYNOPSIS"
.HP \w'\ 'u
vfs objects = shadow_copy2
.SH "DESCRIPTION"
.PP
This VFS module is part of the
\fBsamba\fR(7)
suite\&.
.PP
The
vfs_shadow_copy2
VFS module functionality that is similar to Microsoft Shadow Copy services\&. When setup properly, this module allows Microsoft Shadow Copy clients to browse "shadow copies" on Samba shares\&.
.PP
This is a 2nd implementation of a shadow copy module\&. This version has the following features:
.sp
.RS 4
.ie n \{\
\h'-04' 1.\h'+01'\c
.\}
.el \{\
.sp -1
.IP "  1." 4.2
.\}
You don\*(Aqt need to populate your shares with symlinks to the snapshots\&. This can be very important when you have thousands of shares, or use [homes]\&.
.RE
.sp
.RS 4
.ie n \{\
\h'-04' 2.\h'+01'\c
.\}
.el \{\
.sp -1
.IP "  2." 4.2
.\}
The inode number of the files is altered so it is different from the original\&. This allows the \*(Aqrestore\*(Aq button to work without a sharing violation\&.
.RE
.sp
.RE
.PP
This module is stackable\&.
.SH "CONFIGURATION"
.PP
vfs_shadow_copy2
relies on a filesystem snapshot implementation\&. Many common filesystems have native support for this\&.
.PP
Filesystem snapshots must be mounted on specially named directories in order to be recognized by
vfs_shadow_copy2\&. The snapshot mount points must be immediate children of a the directory being shared\&.
.PP
The snapshot naming convention is @GMT\-YYYY\&.MM\&.DD\-hh\&.mm\&.ss, where:
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
YYYY
is the 4 digit year
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
MM
is the 2 digit month
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
DD
is the 2 digit day
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
hh
is the 2 digit hour
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
mm
is the 2 digit minute
.RE
.sp
.RS 4
.ie n \{\
\h'-04'\(bu\h'+03'\c
.\}
.el \{\
.sp -1
.IP \(bu 2.3
.\}
ss
is the 2 digit second\&.
.RE
.sp
.RE
.PP
The
vfs_shadow_copy2
snapshot naming convention can be produced with the following
\fBdate\fR(1)
command:
.sp
.if n \{\
.RS 4
.\}
.nf
	TZ=GMT date +@GMT\-%Y\&.%m\&.%d\-%H\&.%M\&.%S
	
.fi
.if n \{\
.RE
.\}
.SH "OPTIONS"
.PP
shadow:snapdir = SNAPDIR
.RS 4
Path to the directory where snapshots are kept\&.
.RE
.PP
shadow:basedir = BASEDIR
.RS 4
Path to the base directory that snapshots are from\&.
.RE
.PP
shadow:sort = asc/desc, or not specified for unsorted (default)
.RS 4
By this parameter one can specify that the shadow copy directories should be sorted before they are sent to the client\&. This can be beneficial as unix filesystems are usually not listed alphabetically sorted\&. If enabled, you typically want to specify descending order\&.
.RE
.PP
shadow:localtime = yes/no
.RS 4
This is an optional parameter that indicates whether the snapshot names are in UTC/GMT or in local time\&. By default UTC is expected\&.
.RE
.PP
shadow:format = format specification for snapshot names
.RS 4
This is an optional parameter that specifies the format specification for the naming of snapshots\&. The format must be compatible with the conversion specifications recognized by str[fp]time\&. The default value is "@GMT\-%Y\&.%m\&.%d\-%H\&.%M\&.%S"\&.
.RE
.PP
shadow:fixinodes = yes/no
.RS 4
If you enable
shadow:fixinodes
then this module will modify the apparent inode number of files in the snapshot directories using a hash of the files path\&. This is needed for snapshot systems where the snapshots have the same device:inode number as the original files (such as happens with GPFS snapshots)\&. If you don\*(Aqt set this option then the \*(Aqrestore\*(Aq button in the shadow copy UI will fail with a sharing violation\&.
.RE
.SH "EXAMPLES"
.PP
Add shadow copy support to user home directories:
.sp
.if n \{\
.RS 4
.\}
.nf
        \fI[homes]\fR
	\m[blue]\fBvfs objects = shadow_copy2\fR\m[]
	\m[blue]\fBshadow:snapdir = /data/snapshots\fR\m[]
	\m[blue]\fBshadow:basedir = /data/home\fR\m[]
	\m[blue]\fBshadow:sort = desc\fR\m[]
.fi
.if n \{\
.RE
.\}
.SH "CAVEATS"
.PP
This is not a backup, archival, or version control solution\&.
.PP
With Samba or Windows servers,
vfs_shadow_copy2
is designed to be an end\-user tool only\&. It does not replace or enhance your backup and archival solutions and should in no way be considered as such\&. Additionally, if you need version control, implement a version control system\&.
.SH "VERSION"
.PP
This man page is correct for version 3\&.2\&.7 of the Samba suite\&.
.SH "AUTHOR"
.PP
The original Samba software and related utilities were created by Andrew Tridgell\&. Samba is now developed by the Samba Team as an Open Source project similar to the way the Linux kernel is developed\&.
