Re: cygwin and rsync

["Brett Serkez" <techie at serkez dot net>]

Ken,

The rsync protocol actually does check-suming of blocks to efficiently
detect and transfer files.  While it may look like it is hung, it may
actually be just transfering check sums on each file.  When I perform
long transfers it looks hung from time to time, but my use of the extra
v switches helped me better understand the protocol.

When it stops at a different directory and file, is it always
further along?

It may well be hung, but be sure.  Interesting that it works the other
way without having to build a custom rsync.  I've found this behavior
consistent, but then again, I always install Cygwin with the same set of
packages.  Do you do a full install of Cygwin?  I usually perform a
default install and just add vi, tcsh, openssh and rsync.

Brett

On Thu, 05 Jan 2006 19:37:22 -0500, "Ken Senior"
<seniork@gmail.com> said:
> Thanks Brett for the quick reply.  The multiple -v is a handy thing to
> remember.
>
> In fact this is not my problem though.  It looks like the listing of
> files just hangs midstream.  Some local directories are created and
> sometimes a few files make it too, but it just hangs.  For example:
>
>   . . .
>     recv_generator(MATLAB/wavelab/Papers/SpinCycle/cspinfo03.m,8425)
>     recv_generator(MATLAB/wavelab/Papers/SpinCycle/cspinfo04.m,8425)
>     recv_generator(MATLAB/wavelab/Papers/SpinCycle/cspinfo05.m,8425)
>
> None of these files were actually transferred and there are plenty
> more of these similarly-named files well beyond cspinfo05.m, leaving
> me no additional info.  Moreover, there are no special characters or
> spaces in these files to suggest a problem in the file or directory
> name. Also, each launch seems to stop at a different directory and
> file.  Bizarre. I don't know how to use strace or I'd try that.  -K
>
>
> Brett Serkez wrote:
>
> >Ken,
> >
> >I run rsync both Windows and Linux to Linux, Linux always being the
> >'server'.  In my case I found the hang to be up front, before secure
> >shell even attempted to access the network and also in my case
> >changing from a local socket to a local pipe resolved the issue:
> >
> >http://cygwin.com/ml/cygwin/2005-12/msg01096.html
> >
> >Have you tried adding more v switches to your command line, like:
> >
> >rsync -avvz user@[REMOTE/Windows]:/path/to/stuff/ dest/on/local/
> >rsync -avvvz user@[REMOTE/Windows]:/path/to/stuff/ dest/on/local/
> >rsync -avvvvvz user@[REMOTE/Windows]:/path/to/stuff/ dest/on/local/
> >
> >Each time you a a v switch, it increases the debug output, I think up
> >to 4 or 5.  This would help to narrow the issue as you'll see how far
> >your getting in the protocol which might help narrow the problem.
> >
> >Is it at all possible to go the other way?  I know if you are
> >willing to build your own rsync with the socketpair() called
> >disabled it will work.
> >
> >Brett
> >
> >
> >
> >On Thu, 05 Jan 2006 18:46:04 -0500, "Ken Senior"
> ><seniork@gmail.com> said:
> >
> >
> >>Hi.
> >>
> >>I posted the message listed below to the rsync list, but one of the
> >>readers there suggested I post it here indicating that there's a
> >>known/common problem in cygwin of data loss in local pipes (whatever
> >>that means I am not sure).  I find my rsync command hanging, whether
> >>or not I run it over SSH, that is with our without the --rsh='ssh -l
> >>username'.  I searched and read the archived mail on the cygwin list
> >>archives and though there are six pages of "rsync hanging" issues, I
> >>didn't find much help.  Unfortunately, the logs are saying nothing
> >>and I couldn't get the strace business to work---no doubt because
> >>I've never used it.  Can anyone here suggest anything?  -Thanks
> >>
> >>
> >>
> >>----
> >>
> >>I just installed the latest version of cygwin (1.5.18-1) from
> >>www.cygwin.com on my Windows XP machine.  I have had a lot of
> >>success with rsync between Linux boxes but after many months of
> >>mixed results I have had much less than perfect luck with rsync from
> >>a Linux box [LOCAL] to a windows box [REMOTE]---that is, constant
> >>hanging.
> >>
> >>I have tried to follow the rsync FAQ on using strace to figure out
> >>why things are hanging, but I'm not understanding what gets launched
> >>where and in what order.  I created the rsync-debug script (below)
> >>as suggested, but it's unclear how to use it.  Would you guys mind
> >>giving a step-by-step on how to get this strace info?
> >>
> >>For example, let's say on [LOCAL/Linux] I want to issue the command:
> >>
> >>rsync -avz user@[REMOTE/Windows]:/path/to/stuff/ dest/on/local/
> >>
> >>Do I first launch the rsync-debug on [REMOTE/Windows]?  Do I modify
> >>the above command in order to get things rolling?
> >>
> >>Cheers and thanks in advance.
> >>
> >>-Ken
> >>
> >>----
> >>
> >>rsync-debug script:
> >>
> >>ulimit -c unlimited strace -f rsync --daemon --no-detach 2>/tmp/rsync-
> >>$$.out
> >>
> >>
> >>
> >>
> >>
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> >>
> >>
> >>
> >----------------------------------------------------------------
> >Brett C. Serkez, Techie
> >
> >
> >
> >
>
----------------------------------------------------------------
Brett C. Serkez, Techie



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