[svlug] help transfering data over 1394 cable

[Christian Einfeldt]

hi

On Tue, May 6, 2008 at 2:33 PM, Scott Hess <scott at doubleu.com> wrote:

> If you're only getting 700kbps over your subnet, you're probably doing
> something very wrong in the first place.


No surprises there.    :-/


> You don't indicate what kind
> of network you have,


Cat 5 cable and a Netgear en108tp:

http://kbserver.netgear.com/products/EN108TP.asp


> but if it's 100mbit Ethernet, you should be
> getting ~10 megabytes/second.  If you can saturate that, it would take
> perhaps a day and a half to transfer the full 1.5T.  While that's a
> long time, it's probably faster than getting a firewire network
> working if you're starting from scratch!  Maybe you're somehow going
> through a wireless node or something?


Not likely.  I have cat 5 directly to the netgear device above from both
machines.


> I'd just run rsync between them and leave it alone for awhile,
> monitoring by running df or du periodically on the target.


Sorry to ask a stupid question, but what are the commands there? Just

$ rysnc

and

$ df

and

$ du


> Later,
> check in and run rsync again - this time it should be much faster.


Can you please tell me a little more?  What does rsync do?  It seems
remarkable that a command as simple as

$ rysnc

could solve my problems, but I am willing to believe it.  I just don't want
to overlook the obvious, which I often do.


> You might want to tweak things to use rsyncd rather than ssh, or to
> use blowfish or some other more efficient encryption - but if the
> boxes are 6 months old, their CPUs might be fast enough to saturate
> the network with no tweaking at all.


yeah, AMD 3800 on the rb and 4200 on the tbb, AKFAIK.  You can find the
output of lshw for the tbb lshw here:

http://www.archive.org/details/LshwForTbb

You can find the output for the rb lshw here:

http://www.archive.org/details/LshwForRb


>
>
> You might try plugging a crossover Ethernet cable directly between the
> boxes to make sure nothing else is screwing your networking up.


I can get a crossover cable and be back here at my office within 4 hours.
If you don't mind letting me know what I should do when the xover cable is
in place, that would be great.  Please bear in mind that i have only one
ethernet jack on each machine, so I would need to be off of the Internet
while deploying this diagnostic tool.


> If
> you're lucky, you'll find that both boxes can do gigabit Ethernet, and
> everything will go faster.  Don't know if you can snag a crossover
> cable at Fry's or not.


Got one at the school.


> Having a 16T box implies that it's perhaps got 1T drives?  You might
> be better off just pulling one of those drives and using a sneakernet
> to copy things over.


Not really a tenable solution, because I need to move lots and lots of data
back and forth frequently.  Thanks for the thought, though!

-- 
Christian Einfeldt,
Producer, The Digital Tipping Point
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