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Re: ntfsclone for cygwin 1.7 (issues pointing to shadow copies)


On 07/27/2009 05:48 PM, Rob Bosch wrote:
The issue appears to be with ntfsclone in that it must point to
something  in /proc/partitions. It will not work with any /cygdrive/X (used
dosdev.c from Corinna and typical vshadow to expose as a drive with no luck). I found
this out by commenting out the read-only check and rebuilding
ntfsclone/ntfsinfo. The code apparently uses a win32_io.c file when building
on cygwin. This file creates its own device mappings (e.g. /dev/hda1 instead
of using the existing /dev/sda1). I guess there would be a way to modify it
to use cygwin devices but I don't know how.

If shadow copies could be presented as block devices to this library
then  it would open up a lot of possibilities for creating block-level clones of
partitions without having to boot to a live CD. I guess it is dd piped
through gzip for now. It sure is a waste when you only have 50GB on a 500GB
drive since dd processes the entire drive.

Does anyone have anything else to add? I'm guessing not...

Not much in the way of specific help, no, but I can make two observations:


  1. Using win32_io.c under Cygwin is almost certainly the wrong thing,
     since you'll then be using Win32isms in an environment built to expect
     POSIX mechanisms.

  2. It looks like /proc/partitions isn't populated, so if /proc/partitions
     is the only way that ntfsclone expects to be able to find what it
     wants, then it will be disappointed until a patch is supplied to
     support this.

--
Larry Hall                              http://www.rfk.com
RFK Partners, Inc.                      (508) 893-9779 - RFK Office
216 Dalton Rd.                          (508) 893-9889 - FAX
Holliston, MA 01746

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