On Dec 22 21:55, Mikhail Usenko wrote: > On Sun, 22 Dec 2013 00:02:10 +0000 > Winkel, Richard J. <...> wrote: > > > I have a hard time believing this is an unusual question but I swear > > I've been googling everywhere without an answer! :) > > I'm using rsync (under cygwin) to backup windows servers to a linux box > > and it's working wonderfully, except that if a file is open rsync can't > > access it even for reading. I know some windows-based backup programs > > don't have the problem so I'm hoping there's some way to avoid it in > > cygwin. I've looked at the cygwin mount options but don't see anything > > obvious. Is there a way around it? > > Hello, Richard > You need to use VSS which stands for 'Volume Shadow copy Service' (or > 'Volume Snapshot Service') on Windows. It is based on copy-on-write > technology below the NTFS level and is used by Windows to make backups of the > running system including of opened and locked files. (Also VSS utilizes a > number of 'writers' that helps to make a consistent backup of opened database > files for instance.) The shadow copy may be created by using different > userspace tools: > * vshadow.exe (http://msdn.microsoft.com/en-us/library/bb530725(VS.85).aspx) > * vssadmin.exe (on the server OSes) > * wmic.exe > * by calling COM WMI objects from windows script host > (http://support.microsoft.com/kb/188135) - VBA or JS scripts or from Windows > PowerShell scripts. > > The easiest way to access the created shadow snapshot: > > http://blogs.msdn.com/b/adioltean/archive/2008/02/28/a-simple-way-to-access-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
HarddiskVolumeShadowCopy{0f7ef985-69b8-11e3-8264-ccdf67e6642d} ->
/proc/sys/Device/HarddiskVolumeShadowCopy2
brwxrwx--x 1 Administrators SYSTEM 0, 250 Dec 23 10:32
HarddiskVolumeShadowCopy2
$ 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
--
Corinna Vinschen Please, send mails regarding Cygwin to
Cygwin Maintainer cygwin AT cygwin DOT com
Red Hat
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