I think the word 'theoretically' is key here. From the
anecdotes I've seen regarding speed, about 60 MBytes/sec
would be about the best you could hope for with a single GbE
NIC.
However, if that is the best case scenario then, in theory,
there will be many cases that are worse than this speed.
There's probably quite a lot of overhead though in the CIFS
protocol and this may reduce network throughput for real
data.
I remember when I used iSCSI to transfer 4GB from one
Solaris box to another using a single GbE NIC, I got around
73 MBytes/sec, but note that: (1) this was a small transfer
and so to get real figures I would have to do a much larger
transfer like 100GB and (2) this was with very large video
files specially chosen to get fast speeds. To see this
experiment, see the very bottom of this post: http://breden.org.uk/2008/03/12/home-fileserver-backups/
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