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Date: Wed, 25 Feb 2009 20:44:04 -0500
From: "Larry Hall (Cygwin)" <reply-to-list-only-lh AT cygwin DOT com>
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To: cygwin AT cygwin DOT com
Subject: Re: special name for vss shadow copy device?
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Greg Freemyer wrote:
> On Wed, Feb 25, 2009 at 6:01 PM, Larry Hall (Cygwin)
> <reply-to-list-only-lh AT cygwin DOT com> wrote:
>> Greg Freemyer wrote:
>> <snip>
>>
>>> Time to experiment with Cygwin 1.7
>>>
>>> I know the whole package is still considered test.  How stable is the
>>> actual dll(s).  Especially as relates to this type of functionality.
>> Difficult to say since this functionality isn't on a typical use path
>> and no specific efforts have been made to 'integrate' it into Cygwin,
>> whatever form that integration might take.  What is clear, however, is if
>> there is a problem using this functionality in 1.7, now would be the time
>> to find out.  Since the 1.7 DLL is near its final form for release, any
>> hope of fixing problems before the release requires that they be found
>> first.
> 
> Okay,  (trouble report, see the end of the email.  Successes first :)
> 
> I've got the latest 1.7 release.  I'm testing right now on Vista Home.
> 
> Just as an FYI, this machine has 32 snapshots in place.  Going back to
> Thanksgiving.  All of these were created automatically by Vista.  I
> don't think I did any config work etc. to make it happen.
> 
> I can see these from the Vista Command Prompt by running "vssadmin
> list shadows".
> 
> Very cool.
> 
> dd seems to be working great, but I've only done a couple quick tests.
> 
> dd if=<global-device-path> | od -cv | less
> 
> is showing what looks like good data.
> 
> I tried the same with snapshot instance 33.  As hoped dd came back
> with an error message since that snapshot does not exist.
> 
> I currently have 5 dd's running against 5 different snapshots and the
> output going to /dev/null.    Per task manager all are actively
> reading data.  Very cool.  They are reading very slowly, but then
> again I'm beating the heck out of the drive.
> 
> I tried the "dosdev" trick from one of the links to mount the snapshot
> as V:.  Apparently that is a XP only trick.  Or at least Vista does
> not have it.
> 
> From the Vista command prompt I can do:
> mklink /d C:\shadow_copy21 \\?\GLOBALROOT\Device\HarddiskVolumeShadowCopy21\
> 
> and then cd into that directory and see my old snapshot data.  I can
> also see it from the Vista file explorer.
> 
> From cygwin's shell if I try to do so I get:
> $ cd /cygdrive/c/shadow_copy21
> bash: cd: /cygdrive/c/shadow_copy21: No such file or directory
> 
> I assume that should work?

Dunno.  I can't get the 'cd' or 'dir' to work from the Vista command
prompt.  For me, 'dir foo' (I named the link 'foo') gives me 'File Not
Found'.  So in my case, what you see from Cygwin makes sense since it's
consistent with what Windows tells me.

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

_____________________________________________________________________

A: Yes.
 > Q: Are you sure?
 >> A: Because it reverses the logical flow of conversation.
 >>> Q: Why is top posting annoying in email?

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