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ftp slow with largefiles

Valued Contributor

ftp slow with largefiles

Hi guys,

i have a problem with ftp.

This is the scenario:


I must do ftp from my hpux 11.11 server to aix server.

Aix  have a 10Gigabit and work fine with all system

My Hpux have a : 

HP AB545-60001 PCI/PCI-X 1000Base-T 4-port 1000B-T Adapter


I have a direct connection between aix and myhp without network switch router etc etc ...

No network error


Aix all parameter ok


MyHpux :


# ulimit -a
time(seconds) unlimited
file(blocks) unlimited
data(kbytes) 1953124
stack(kbytes) 131072
memory(kbytes) unlimited
coredump(blocks) 4194303
nofiles(descriptors) 500


myhpux:/ # ndd -get /dev/tcp tcp_recv_hiwater_def


myhpux:/ # ndd -get /dev/tcp tcp_recv_hiwater_max


myhpux:/ # ndd -get /dev/tcp tcp_xmit_hiwater_max


myhpux:/ # ndd -get /dev/tcp tcp_conn_request_max


myhpux:/ # ndd -get /dev/tcp tcp_ip_abort_interval


myhpux:/ # ndd -get /dev/tcp tcp_xmit_hiwater_def


rmdtwh20:/ # ndd -get /dev/tcp tcp_rexmit_interval_initial




If i do  ftp :

IDLE 70 %    file 796 MB

7.68 seconds (101234.30 Kbytes/s)            BEST



IDLE 70 %    file 1500 MB

14.56 seconds (100620.94 Kbytes/s)          BEST


IDLE 70%      file  1987 MB

2083012608 bytes sent in 99.17 seconds (20512.23 Kbytes/s)       SLOW !!!!!!!!


This is the problem with a largefiles .  If i copy a file more larger than 1987 MB,

the performance are degraded .


I use a :


ftp -B 1024 aixsystem:



put ....


Any idea ? 

Help me 

Thanks a lot ....



P.S. This thread has been moved from HP-UX > System Administration to HP-UX > networking







Steven Schweda
Honored Contributor

Re: ftp slow with largefiles

Valued Contributor

Re: ftp slow with largefiles

Hi stev thanks a lot for response.
Good question.

- i had try a scp, sftp, rcp, but All are slowest of ftp . Ftp is fastest
- tomorrow in the Office i get a info form my server but for now
Hpux 11.11 with patch deve ber 2010
Aix is on new hardware info tomorrow
Exactly only cable dedicated connection from my hp And aix for application migration
I asked Aix parameter to aix sistema engeen. I think that are Good because aix haven't problem with
Other systems
The source And the destination are the same for small And big file.
I had test a copy also from a another cluster node And work very fine(100 mb) but also with 800 mb files
Tomorrow i test file >2gb


Valued Contributor

Re: ftp slow with largefiles

Are there any kernel parameter to' improve my network copy?
My ndd parameter are ok ?
Valued Contributor

Re: ftp slow with largefiles

any idea ?