ftp transfer rate issue..between two unix hosts

[chindi]

Hi ,
We have two rx6600 servers with 1000base T lan cards..1000FD /auto-neg on settngs ...
the same settngs are at the switch ports too..

But even afetr that we are nt gettng the desired speed...the link is of 45 Mbps..

The speed between two windows machine in the same WAN is about 3.5 - 4 MB/s...
Whereas betwenn two unix hosts it is 1.2MB/s..

Do we need to tune any netwrok parameter at O.S end..like tcp/ip...using ndd..
o.s 11i23 , 16gb Ram...
kindly suggest...

[Torsten.]

First you need to tell what OS is running.

If 11.31, use

# nwmgr -c lan0 -v

to get the current link speed (adjust lan0, please).

[chindi]

Hi Torsten ,

Its 11i23..

[chindi]

Hi Torsten ,
Kindly suggest

[Torsten.]

Try


lanadmin -x 1 (for lan1)

[chindi]

Hi Torsten ,

At both server as well as switch end the speed set is 1000FD Auto-neg on ...

also the latency between two unix boxes is 30ms OVER THE WAN...
Still m not able to achieve the transfer speed as that of two windows boxes....on SAME WAN..

[Jose Mosquera]

Hi,

Have you reviewed if the absence, or incorrect definition of any static route are causing that your data packages are going by a long way path to reach your target server. You can verify this probability with "traceroute" command from each side of your servers.

Use "netstat -rn" command to view your current routing tables definitions.

Rgds.

[chindi]

Hi Jose ,

The hops are the same for both windows and hp boxes..

Can we look from ndd paremetrs point of view...???

[Earl_Crowder]

I would suggest increasing the buffer space for ftpd and ftp using the "-B" argument. Start with 2048 (a 2MB buffer), and see if that improves performance.

Modify inetd.conf on the server side:
ftp stream tcp6 nowait root /usr/lbin/ftpd ftpd -l -B 2048

From the client side:
ftp -B 2048 server

Earl

[Alzhy]

So you have 2 sites. Each with WIndows and rx6600 servers. Both are connected Gigabit to local switches. The two sites are connected vi a WAN of 45Mbps (an OC3?).

Ad you are wondering why WIndows to WIndows xfers are 3.5 to 4MB/s (Full OC3/WAN Speed). Whilst UNIX to UNIX are a measly 1.2MB/s.

And you are testing via FTP.

Possibilities between the disparity are:

- HOW you test. (Use NULL Ftp on UNIX that does not involve disk if it helps)
- Have you ensured that during your UNIX ftp test that there are no other load on the WAN?
- Last, check with your Network Folks -- if they have somewhting set up on the WAN config that limits certain networks or hosts to be restricted not to use the entire expensive WAN pipe.