Thank you, we’ve already compared TCPIP configurations, and they are identical
Dave Jousma Vice President | Director, Technology Engineering From: IBM Mainframe Discussion List <[email protected]> on behalf of rpinion865 <[email protected]> Date: Thursday, March 28, 2024 at 8:47 AM To: [email protected] <[email protected]> Subject: Re: Slow FTP's z/OS TCP/IP is not my area of expertise. I would check to insure the ITRACE and PKTTRACE are turned off, and take a look at TCPCONFIG TCPMAXRCVBUFRSIZE TCPRCVBUFRSIZE TCPSENDBFRSIZE And, another possibility D TCPIP,tcpipname,NETSTAT,DEV Look z/OS TCP/IP is not my area of expertise. I would check to insure the ITRACE and PKTTRACE are turned off, and take a look at TCPCONFIG TCPMAXRCVBUFRSIZE TCPRCVBUFRSIZE TCPSENDBFRSIZE And, another possibility D TCPIP,tcpipname,NETSTAT,DEV Look for CHECKSUMOFFLOAD YES Sent with Proton Mail secure email. On Thursday, March 28th, 2024 at 8:30 AM, Jousma, David <[email protected]> wrote: > All, > > Grasping at straws here, IBM support center is baffled too. > > To clone z/OS maintenance to various disconnected sysplex’s I do a DFDSS > dump, and FTP it everywhere it needs to be. Its roughly a 50Gb file transfer. > There is some environmental issue causing slow file transfers to some systems > (40mb’s a sec) and fast file transfers (150Mb/sec) to other systems on the > same CEC. With IBM support help, we’ve narrowed down the problem to the > specification of MODE B and EBCDIC on the transfer since it is a DSS dump. > Remove those, and the transfer is fast on the slow systems, and still fast on > the fast systems. Obviously that isn’t a solution though. > > So, we are a GDPS shop. The oddity is that all the “fast” transfers are to > the K systems(control systems), and all the “slow” transfers are to the > traditional application systems. TEST, DEV, PROD makes no difference, nor > does LPAR busy or not busy. > > It seems there is something configured differently on the “slow” systems that > is affecting mode b, ebcdic file transfers, but for the life of me, I cannot > put my finger on what, nor can the support center, except that the issue is > at the remote end, in that the OS cannot offload the data fast enough, so > TCPIP/FTP is slowing the transfer pace. > > A virtual adult beverage of choice to the one that can point in a direction > to look…. > > > Dave Jousma > Vice President | Director, Technology Engineering > > > > > > This e-mail transmission contains information that is confidential and may be > privileged. It is intended only for the addressee(s) named above. If you > receive this e-mail in error, please do not read, copy or disseminate it in > any manner. If you are not the intended recipient, any disclosure, copying, > distribution or use of the contents of this information is prohibited. Please > reply to the message immediately by informing the sender that the message was > misdirected. After replying, please erase it from your computer system. Your > assistance in correcting this error is appreciated. > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN This e-mail transmission contains information that is confidential and may be privileged. It is intended only for the addressee(s) named above. If you receive this e-mail in error, please do not read, copy or disseminate it in any manner. If you are not the intended recipient, any disclosure, copying, distribution or use of the contents of this information is prohibited. Please reply to the message immediately by informing the sender that the message was misdirected. After replying, please erase it from your computer system. Your assistance in correcting this error is appreciated. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
