IIRC, PING is answered by the adapter. There does not need to be an active operating system, so that points to the network. What does a TRACERTE from the host to each server show? Are all the paths (hops) the same? How about a TRACERTE from each server to the host? Do the failure occur at specific times, such as when a large FTP is in progress?
Intermittent failures may suggest exhaustion of a key network resource. Have your network folks look at dropped packet counts. Don't know if it applies in this scenario, but network folks love to constrain ports. Could be you are running out. Is there a server in the path? -----Original Message----- From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of Sabo, Frank Sent: Thursday, May 13, 2010 2:49 PM To: [email protected] Subject: FTP and systems PING question. FTP and systems PING question. Environment: We have Z9 J01 with one processor with three LPARS, production, test and tech, all three shares one OSA adapter. The systems are running z/OS 1.9. Looking at my monitor's, the production lpar is only 29.5% busy while the test lpar is 2.2% the tech lpar does not come into play since it my sand box. IO and paging are not very heavy at the time. I talked with network personnel and the see not issues on the network at the time failure. Problem: We have six UNIX boxes that all issue a ping command to the mainframe at the same time before starting the FTP process. Five pings are directed to the production LPAR and one box is directed to the test LPAR. The all five ping's failed pointing to the production side but the test completed successfully. I don't see any TCPIP errors on either LPAR. I can not explain the difference between the two LPARS why one works and the other one fails. We currently do this process about 1500 times a day if not more. The process works fine most of the time but every once in a while it fails. Not sure where to look for the problem the monitors and logs don't show anything that I can see. Any help would be appreciated. Frank W Sabo Jr. SR. Systems Administrator Giant Eagle Inc. Phone: 412 967-3764 Fax: 412 967-6120 Email: [email protected] ---------------------------------------------------------------------- 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 NOTICE: This electronic mail message and any files transmitted with it are intended exclusively for the individual or entity to which it is addressed. The message, together with any attachment, may contain confidential and/or privileged information. Any unauthorized review, use, printing, saving, copying, disclosure or distribution is strictly prohibited. If you have received this message in error, please immediately advise the sender by reply email and delete all copies. ---------------------------------------------------------------------- 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
