Hello, The problem was coming from our OSA card port that was configured Autonegociate and running 100 Mbps half duplex. The router is configured 100 Mbps full duplex and there was a lot of communication collisions because of this mismatch. I configured the OSA card port at 100 Mbps full duplex and now with FTP I could reach 8000 K/sec with Linux and Windows server as well. I don't know why but the impact of this problem was more severe with LINUX.
Thanks! François Paré tél.: 4013 -----Message d'origine----- De : IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] De la part de Rob Schramm Envoyé : 19 juin 2008 17:40 À : IBM-MAIN@BAMA.UA.EDU Objet : Re: Slow FTP transfer from z/OS to Unix François, Honestly, I am not sure what to make of the problem. But for general problem solving, I would ensure that files being transferred are all the same. That the direction is the same. I am always suspicious of files, ftp options, network paths (thru routers, cables and firewalls) and MTU. I have seen or been part of a number of bizarre TCP/IP problems over the years and anything you can do to normalize your testing/verification will help yield tests that will uncover the real culprit. problems... firewall rules gone bad, firewall loose cables, tar pits, packet fragments not being accepted, bad routing, excessive retransmitting, ftp bugs, osa bugs, windows bugs (exhausted windows resource causing the IP stack to report errors) .. I am sure that there are some choice ones I am forgetting... like s0c4 on a vba file ftp, port scanners for security killing boxes. Rob p.s. You might also consider running TRACE on the LINUX box as well. -----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of François Paré Sent: Monday, June 16, 2008 2:15 PM To: IBM-MAIN@BAMA.UA.EDU Subject: Slow FTP transfer from z/OS to Unix Hello, I'm running a batch job that does a FTP transfer from a z/OS mainframe to a LINUX server and the transfer rate is about 20K/sec. If I do the same FTP transfer to a Windows server I got a transfer rate of about 900K/sec. The mainframe OSA card is running at 100 Mb/sec full. Since the Windows and the LINUX server are on the same switch and got the same throughput capability I suppose that there is an optimal setting that is done automatically when the transfer is done with a Windows server but this setting is not done automatically with a LINUX server. I tried PASV but it didn't change the bad transfer rate. Could you tell me what this setting could be? Thank you! ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
