> For the first two hours of transfer, the transfer rate was 1GB/30 minutes.
> After 28hours of transfer, it was 35GB completed. After another 15 hours,
> it was only 45GB. Which mean, the transfer rate now is 1GB/1.5hours.
>
> Both systems are not running any program.
You might want to collect some statistics at various points during
the transfer: the status of the vm, disks and the network. See
{vm,net,io}stat man pages.
One possibility is that over time, the data coming over the network
pollute the page cache causing the system to swap. If you see any
swap activity, that's surely the culprit.
Might also want to check the block sizes on both the boxes. To narrow
down the problem, you might want to try a different OS (say Solaris,
FreeBSD) at either end to find the culprit.
-Arun
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