In my limited experience, I have found that drastically different ftp put and
get rates are attributable to duplex mis-match problems. I would check and
re-check the duplex settings ... try forcing all ports to 10M/Half, check the speeds;
then set to 10M/Full and check the speeds; and so on all the way up to 100M/Full.
Some hardware just doesn't auto-negotiate correctly, some UNIX machines
don't like to be forced to a particular rate, etc, etc.
On Friday, December 20, 2002, at 03:46 PM, [EMAIL PROTECTED] wrote:
I have a truly puzzling ftp question. Between heterogenous platforms, I am
seeing radically different ftp performance when doing puts than when doing
gets. I am seeing this in two separate instances
Instance #1) From my NT desktop to our P390 Mainframe Emulator I can do an
FTP put of a 100MB file relatively quickly. A get from the mainframe to my
PC of the same file runs extremely slow or hangs altogether. We have
experimented with adjusting MTU size, full or half duplex, etc., to no
useful effect.
Instance #2) From a solaris box in our US office to a solaris box in our UK
office we see radically different times for puts and gets. A put inititated
in our US office to the UK server takes about twice as long as a get of the
same file back from the UK office.
In this second instance, we have have two connections to our UK office, a
128k direct frame link and a 2Mbit ATM link that is shared with our other
European offices. All TCP connections initiated in the US office flow over
the 128k frame link. All connections initiated in the UK office flow over
the 2MBit shared ATM link. FTP transfers initiated from the UK office to the
US office (solaris to solaris, again) take the longest of all, about 3 times
as long as the gets initiated from the US side.
What is going on here? Why in the local office from desktop to mainframe
are puts faster than gets and why on the slower frame link from US to UK are
puts always faster than gets?
Is there some wierdness with the FTP protocol or with individual
implementations of FTP that I am not understanding?
Any help will be greatly appreciated.
:)
Joshua Putnam
Sr. Systems Administrator
Ascential Software, Inc.
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PeteC
Peter Charbonneau
Sr. Network and Systems Administrator
Williams College
(413) 597-3408 (desk)
(413) 822-2922 (cell)
