Slow File Transfers with 100 MBit Network
I have a Novell 4.1 Server on a 100 MBit network using Cogent EM/PCI
card. I use 4-4GB Baracudda Drives and a Q-Logic PCI SCSI Card. The
file transfer rate to a DOS Client is 2.8 MBytes/sec the first time and
no more than 4.0 MBytes/sec any additional time. This transfer rate
seems incrediblly slow. The PERFORM3 numbers are 6-7 MBytes/sec. These
two machines are the only things on the network. Is this number the
best I can expect or is something wrong. Anybody out there have a
similar setup or some other numbers?? I have tried a Windows/NT Server
3.51 with the same hardware and the numbers are even worse clocking in
at no more than 1.7 MBytes/sec. Any ideas would be appreciated.
ApprenticeRating: 0%, 0 votes
33% only on a congested full used network, not on an empty lan. At our lan
which is often very quiet, I am able to get 1000k/s (perform3) over 10
Mbit. He and we're only a bunch of students :)
My guess us that at 100 Mbit/s the net isn't the only thing bottleneck
anymore. Maybe it is possible to get more than one client using perform3
and see if how much the server can get on the net. I think that 6-7 MB with
perform3 is quite ok.
Greetz,
Sjoerd
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ApprenticeRating: 0%, 0 votes
Let's try some arithmetic here. 100 Mb/sec works out to 12.5 MB/sec.
Although I don't know the Cogent card right offhand, I assume it to be
a CSMA/CD using the same media access as traditional Ethernet. That
would mean you're getting about 33% of the theoretical bandwidth,
which turns out to be about right. Frankly, I don't see the problem.
--
Roger Kresge, Master CNE/CNI Internet:
Inacom Information Systems Compuserve: 71023,447
Lancaster, PA
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