Re: FTP /performance issue question

Basically we have an application that currently uses both IP addresses and
we have each IP address attached to it's own nic.



IBM AIX Discussion List <aix-l@xxxxxxxxxxxxx> wrote on 08/14/2006 04:51:32
PM:

If you have 2 adapters on the same subnet why would you not etherchannel
them vs. having separate IP addresses ?

Lamar

-----Original Message-----
From: IBM AIX Discussion List [mailto:aix-l@xxxxxxxxxxxxx] On Behalf Of
Andrew.Townsend@xxxxxxxxx
Sent: Monday, August 14, 2006 2:16 PM
To: aix-l@xxxxxxxxxxxxx
Subject: FTP /performance issue question

Hello,

I'm running a test FTPing files between two AIX servers.

Server proa has two network adapters on the same subnet, both Gig-E.

I've tested with TSM server, FTPing files from the TSM server directly
to
each interface on proa. I've also FTPed files back. Below are some
averages
of transfer times.

X.X.1.11 interface:

Binary: 65536000 bytes sent in 0.7721 seconds (8.289e+04 Kbytes/s)
ascii: 65536000 bytes sent in 2.203 seconds (2.905e+04
Kbytes/s)


X.X.1.12 interface:

Binary: 65536000 bytes sent in 0.7652 seconds (8.364e+04
Kbytes/s)
ascii: 65536000 bytes sent in 2.224 seconds (2.877e+04
Kbytes/s)

FTPing back to the TSM server from proa, the results were pretty
consistent, taking much longer to FTP the files back from proa to TSM
(this
would seem likely considering that I cannot choose which interface to
send
files from):

Binary: 65536000 bytes sent in 1.099 seconds (5.821e+04
Kbytes/s)
ascii: 65536000 bytes sent in 1.297 seconds (4.935e+04
Kbytes/s)

Binary: 6536000 bytes sent in 1.121 seconds (5.707e+04
Kbytes/s)
ascii: 65536000 bytes sent in 1.307 seconds (4.898e+04
Kbytes/s)


I'm trying to troubleshoot why it takes so much longer to send a file to
proa regardless of which adapter I connect to, rather then sending a
file
from proa. I do realize that when sending the file from proa, I cannot
choose which adapter to send from.

The actual command I am using to send the file once I connect using ftp
is:
ftp> put "|dd if=/dev/zero bs=32k count=2000" /dev/null

If anyone would care to shed any light why I may be seeing this symptom,
it
would be much appreciated.

TIA


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