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Transfer of large files

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by jlm_14 1 view

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I have 2 NT workstations Networked with a crossover cable. One workstation (wks1)is connected to a scanner that is scanning images to .tif files that are 1.5gb. The scanner scans the file to a temp folder on wks1 and I have drives mapped from workstation2 (wks2) and when the image is to be saved to a mapped drive from wks2 the transfer fails with these large files and I get the error "The system was attempting to transfer file data from buffers to \m:\wks1\sd1\*.tif The write operation failed and only some of the data may have been written to the file." Now when saving smaller files the transfer does not fail. Also the 2 workstations are connected by gigabit ethernet cards "Intel Pro/1000 and the transfer between the 2 workstations is no faster than if I were using 10/100 cards. Wks2 also has a 2nd NIC which connects it to the rest of our Network. The 2 gigabit cards are communicating with different IP addresses that are not recognized by the rest of the network which is the way wewant it to be. Why are my transfers slow, and why am I unable to transfer those large files without errors when there is no other traffic going between wks1 and wks2.

7 replies

by maxwell edison

It sounds as though you have a Data Synchronization issue to deal with. I don't have a lot of experience with crossover cable methodology, so I can't suggest anything in particular, but look at the following article for information that may be helpful.

http://www.inmon.com/ha-app-note.htm

REMOVE SPACES from the pasted URL.

In that article, look at setup step number 5 for the data synchronization configuration issues. I realize this article is product specific (not your product), but itmay provide a clue for you. I would guess that in your case, data synchronization is addressed in your NIC configuration program.

I hope this at least steers you in the right direction.

Good luck,

Maxwell

by jlm_14

Thanks for answering my question but after more thought I realized it was not the NIC's at all but it waas the speed of the drives in the machines giving me my bottle neck.

by thechas

If Maxwell's answer doesnot do the job, I would take a look at the available resources on each system.

I suspect for a direct cable file transfer to work, you need enough free real and virtual memory to contain the file.
This means that you may need a 2GB or larger paging file!

Chas

by jlm_14

Thanks for answering my question but after more thought I realized it was not the NIC's at all but it waas the speed of the drives in the machines giving me my bottle neck.

by shmaltz

If you try saving on your local machine does it work even if it's a large file?
If it doesn't than the problem is not with network speed.
When you use crossover cable from computer to computer; if one of the NIC's is capable of doing 100mbps then unless the other computer has already initialized on 1000mbps the NIC will initialize on 100mbps. The reason for this is, because the NIC checks if anyone on the other side of the cable can communicate using 1000mbps, if it doesn't receive an answer (in you case because the other machine is not yet on). The NIC assumes that it didn't receive an answer because the other machine can't communicate using 1000mbps so it defaults to 100mbps. Now when you turn on the second machine it does the same thing, but since the first machine already initialized on 100mbps it can only communicate on 100mbps. Since it's imposible to initialize one machine to 1000mbps without having another mahcine intialized first the only way this will work is if you have a1000mbps hub/switch (one other way might be is to set the NIC's to use 1000 mbps instead of auto, you can set this in the network properties, but I'm not sure it will help much).

by jlm_14

Thanks for answering my question but after more thought I realized it was not the NIC's at all but it waas the speed of the drives in the machines giving me my bottle neck.

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