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Date:	Mon, 23 Dec 2013 10:36:18 +0100
From:	Corinna Vinschen <corinna-cygwin AT cygwin DOT com>
To:	cygwin AT cygwin DOT com
Subject:	Re: "Device or resource busy" during read (rsync)
Message-ID:	<20131223093618.GA19257@calimero.vinschen.de>
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References:	<C14924774373A047BE1F8EF948922F493EEF3E6A AT UM-MBX-T03 DOT um DOT umsystem DOT edu> <20131222215504 DOT d590c9d0fad214acdeaf6bf5 AT nm DOT ru>
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On Dec 22 21:55, Mikhail Usenko wrote:
> On Sun, 22 Dec 2013 00:02:10 +0000
> Winkel, Richard J. <...> wrote:
>=20
> > I have a hard time believing this is an unusual question but I swear=20
> > I've been googling everywhere without an answer!  :)
> > I'm using rsync (under cygwin) to backup windows servers to a linux box=
=20
> > and it's working wonderfully, except that if a file is open rsync can't=
=20
> > access it even for reading.   I know some windows-based backup programs=
=20
> > don't have the problem so I'm hoping there's some way to avoid it in=20
> > cygwin.  I've looked at the cygwin mount options but don't see anything=
=20
> > obvious.  Is there a way around it?
>=20
> Hello, Richard
> You need to use VSS which stands for 'Volume Shadow copy Service' (or  'V=
olume Snapshot Service') on Windows. It is based on copy-on-write technolog=
y below the NTFS level and is used by Windows to make backups of the runnin=
g system including of opened and locked files. (Also VSS utilizes a number =
of 'writers' that helps to make a consistent backup of opened database file=
s for instance.) The shadow copy may be created by using different userspac=
e tools:
> * vshadow.exe (http://msdn.microsoft.com/en-us/library/bb530725(VS.85).as=
px)
> * vssadmin.exe (on the server OSes)
> * wmic.exe
> * by calling COM WMI objects from windows script host (http://support.mic=
rosoft.com/kb/188135) - VBA or JS scripts or from Windows PowerShell script=
s.
>=20
> The easiest way to access the created shadow snapshot:
>  http://blogs.msdn.com/b/adioltean/archive/2008/02/28/a-simple-way-to-acc=
ess-shadow-copies-in-vista.aspx

You can access the shadow copies in Cygwin via /proc/sys:

  $ cd /proc/sys/Device
  $ ls -l HarddiskVolumeShadowCopy*
  lr--r--r-- 1 Administrators SYSTEM      0 Dec 23 10:32 HarddiskVolumeShad=
owCopy{0f7ef985-69b8-11e3-8264-ccdf67e6642d} -> /proc/sys/Device/HarddiskVo=
lumeShadowCopy2
  brwxrwx--x 1 Administrators SYSTEM 0, 250 Dec 23 10:32 HarddiskVolumeShad=
owCopy2
  $ cd HarddiskVolumeShadowCopy2/

Note the trailing slash in the last cd command!  It's required due to
the dualism of the HarddiskVolumeShadowCopy2 entry, being a device *and*
the root dir of a drive.  ANyway, after this, you can access the shadow
copy just like your normal drive:

  $ ls
  $Recycle.Bin            hiberfil.sys         swapfile.sys
  bootmgr                 pagefile.sys         Symbols
  BOOTNXT                 PerfLogs             System Volume Information
  Config.Msi              Program Files        Users
  cygwin                  Program Files (x86)  Windows
  cygwin64                ProgramData
  Documents and Settings

> Then rsync can be used to copy files from the shadow snapshot after which=
 the snapshot can be deleted.

Right.


Corinna

--=20
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Maintainer                 cygwin AT cygwin DOT com
Red Hat

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