# Time taken to copy a file using 1GB network card

I have 2 servers connected back to back using cross cable.
The 2 servers have 1 Gbps LAN card.
I need to transfer 6.5 TB of data
How much approximate time it will take for the data transfer
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Commented:
807.146 minutes.

I used http://www.calctool.org/CALC/prof/computing/transfer_time to find out .
Commented:
I'm guessing you've got SATA (or even SCSI) hard disk drives in them, in which case the bottleneck on the transfer is the 1Gbps LAN cable.

Now I hope I've done the math right:

6.5 x 1,000,000,000,000 bytes ÷ ( 1,000,000,000 ÷ 8 ) bytes
= 52,000 secs
= 866.67 mins
= 14.44 hrs
Commented:
It's difficult to say because there are other factors...ie if you have a few large files it will copy quicker than many smaller files...as a rough estimate I'd say about 15-18 hours (if that network card is dedicated to only that)

This calculator is pretty good, but obviously a rough one.

http://www2.arnes.si/~kriskem1/hihi/calc_trans.htm
Commented:
I'd like to add that that calculation is based on theory, so in reality you're looking at about 20-25% more time than that to safely account for overheads.

so 52,000 x 1.2
= 62,400 secs
= 1040 mins
= 17.33 hrs
Commented:
No way to tell for sure. It depends on what program use to copy, windows or 3rd party. Windows is slow, it caches. Some 3rd party utilities use CRC checking, thus slowing it down. Robocopy is a good choice. I also had good experience with syncback se.
Here's a secret, don't tell anyone. Use FTP. It's the quickest. Setup an FTP site on the receiving server and use a FTP client on the sending server to perform the upload.

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