A bit of black magic: How to assign drive letters to VSS shadow copies... on Windows XP !

re: A bit of black magic: How to assign drive letters to VSS shadow copies... on Windows XP !

Denys — Tue, 19 Sep 2006 09:34:05 GMT

Thanks Adi. This is so perfect. For those of us struggling with backups in the XP environment, the combination of rsync (plus ssh) and vshadow creates the most efficient solution for local and offsite backups I can find. Highly recommended. I just added the rsync command into the vss-exec.cmd file after "Try to execute some commands".
(rsync seems so dangerous with open files; in my experience it overwrites exisiting files with new copies of open files that are damaged (failed verification - update retained). .pst files overwritten in this way cannot be opened (although they can be substantially recovered with scanpst).
Grateful for any additional thoughts on rsync integration with vshadow.

Assign drive letters to VSS shadow copies under Windows XP

Aaron Tiensivu's Blog — Tue, 19 Sep 2006 16:21:27 GMT

I didn't think it was possible, previously, but apparently it is. I won't cut and paste here because I'd rather send you to the source.

A great Microsoft blog writeup on it

re: A bit of black magic: How to assign drive letters to VSS shadow copies... on Windows XP !

Denys — Tue, 19 Sep 2006 18:20:57 GMT

Only slightly disappointing feature of rsync is that it seems to copy the whole shadow copy file rather than just the changed blocks (as it would do on a closed file without vshadow).
I can't prove this; and I am not sure why the shadow copy would radically change the block structure so that this happens. But it does seem to copy much more data than before on a closed .pst file, for instance (of course .pst files are strange animals)

re: A bit of black magic: How to assign drive letters to VSS shadow copies... on Windows XP !

AdiOltean — Wed, 20 Sep 2006 01:06:38 GMT

PST replication is weird - many resyncing techologies are not getting it right.

In Windows Server 2003 R2, there is a new replication technology called RDC (Remote Differential Compression) that can have amazing performance reductions on PST file replication. In this slide (slide 18 at http://download.microsoft.com/download/3/0/a/30a7c570-2d14-4e87-90cf-dead9151a9e4/2003%20Windows%20Server%202003%20R2.ppt) you can see savings of up to 400% for PST files up to 300 MB. (savings compared to the full copy)

re: A bit of black magic: How to assign drive letters to VSS shadow copies... on Windows XP !

Denys — Wed, 20 Sep 2006 09:08:33 GMT

Thanks. I will check this out.

A simple way to access Shadow Copies in Vista

Antimail — Thu, 28 Feb 2008 21:37:19 GMT

In the past, I presented various ways to browse these mysterious device objects called "shadow copies".

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