rsync replacement

[Mike Jackson]

Jamie,

We are not claiming superiority, just that we provide performance  
gains over TCP when going over wan or congested networks.  In-fact,  
we have a ftp server set up in Singapore if you would like to compare  
our technology to your ftp solution.  you can find the client  
download on our site.

Mike



On Jul 17, 2007, at 5:03 AM, Jamie Lokier wrote:

> Matt McCutchen wrote:
>>>   Does anyone have any experience with 'syncdat' from Data
>>> Expedition?  How does it compare to rsync?
>>
>> I looked at the syncdat feature list (
>> http://www.dataexpedition.com/syncdat/features.html ).  Aside from  
>> the
>> claim of much better performance, syncdat appears to be equivalent to
>> a combination of rsync, unison, and ssh.  Mike, am I missing  
>> something
>> that syncdat can do but rsync and unison can't?  And is more
>> information available about the benchmark that found that syncdat is
>> "Up to ten times faster than rsync" (
>> http://www.dataexpedition.com/syncdat/ )?
>
> I looked at their web site, and they're claiming that their patented
> MTP/IP protocol is so much superior to TCP/IP over wide area networks
> that it makes data transfer faster - due to handling congestion
> better.  If you're transferring over a LAN, or uncongested network, it
> offers no advantage.
>
> I read their patent; it's written in impenetrable bullshitese, and
> seems to resemble a sort of transaction-oriented TCP SACK.  If I had
> to trial their program, I'd compare with HTTP, FTP or rsync/similar
> over a modern TCP or SCTP implementation with a few of the esoteric
> TCP congestion control modules in 2.6 Linux, and ensure I wasn't CPU
> bound.
>
> Their FAQ indicates that their program does not compress
> automatically, and I saw no indication of a delta-transmission
> protocol equivalent to the rsync algorithm.
>
> They have a product which tunnels any TCP/IP stream over their MTP/IP.
> I'm guessing running rsync over that would give the same gains as
> using their file transfer utility, assuming there are gains, and the
> added benefit of rsync delta-transmission.
>
> -- Jamie

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