ERROR: writefd_unbuffered failed to write ... when COMPRESS

Matthias Meyer Matthias.Meyer at
Fri Dec 5 17:41:54 GMT 2008

Am Freitag 05 Dezember 2008 schrieb MATV:
> Hello,
> (Sorry, my english is no good)
> I've been searching for solutions but I don't find it.
> I'm using last version of cygwin (1.5.25-15) on Windows 2003 Server for
> transfer a Virtual Machine Backup (<2 GB .vmdk files; VCBMOUNTER) to a
> remote site with same rsync version.
> Sometimes this rsync task fails to transfer a file with compress (z) but
> doesn't fail without this argument. My frame of time for transfers is
> reduced and, at this moment, I'd need compress.
> Anybody knows why or how to solve it?  Is compress the random problem? 
> be a programming bug?
> This error happen with compress but not always.
> Where can I find values for  --compress-level   parameter?
> I hope to have explained it.
> Thanks in advance, Miguel.
I've this feature too.
In my experience you have no chance. -c did not work on windows clients.
But you can try a ssh-tunnel and let ssh do the compression job.

Don't Panic

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