SMB performance much lower than FTP
davecb at canada.sun.com
Tue Nov 27 05:16:11 GMT 2001
I have a colleague seeing a very odd behavior with copies
done from a pc client to either a Samba or a Sun "Cascade"
The SMB copies are roughly ten times slower than ftp (!)
Louis Caron writes:
| Their application is write intensive - copying
| several largish (1-2GB ) files up to the file server.
| File copies (to the server) are approx. 7-10 times faster with
| FTP vs. PC Netlink
[PC Netlink is the Sun/AT&T SMB server. In off-line
discussion, this same effect was seen with Samba --dave]
| (FTP is 70-80 mbits/sec, PC Netlink is 7-10 m/bits/ sec).
| The customer is running: SunFire server 4800, Solaris 8 latest
| version & patches, NT4 server, SP6. All servers have 100mbits
| network card, full-duplex. The file transfer that was tested
| is from the NT4 server to the SF4800 server.
[The tests were run from the command-line using
the copy command, and there were no unusual network
symptoms: errors and collisions were both minuscule]
| We also tested file transfer from one NT4 server to another
| NT4 server, and we don't notice any performance problem !!!
This is puzzling: usually we see network problems
when the performance is much lower, and we diagnose
them by seeing that the ftp speed is comparable to
Samba. In this case, we've a real difference between
SMB and FTP...
Before we set up a testing process, can anyone
suggest why SMB would be orders of magnitude slower
than FTP on large transfers?
David Collier-Brown, | Always do right. This will gratify
Americas Customer Engineering, | some people and astonish the rest.
SunPS Integration Services. | -- Mark Twain
(905) 415-2849 | davecb at canada.sun.com
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