Chen, No, console remained connected, the screen goes from displaying the DASD to a Linux boot. I was in such shock as it happened; I failed to capture a screen shot.
Our terminal settings were/are: LINEND # BRKKEY PA1 Alan, Martin, Mauro & Rob Van der Heij, Thanks very much for your feedback, I think what you added to this discussion is the solution. All of you give great value to this List Serv. This being a production system, I cannot test it right way out of the risk of job security, but I am in the process of setting up a test server attached to a large number of "unused" DASD devices and see if I can recreate the problem and then test your solution. I plan to test it with and without an ORACLE RAC. James Chaplin Systems Programmer, MVS, zVM & zLinux -----Original Message----- From: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of Eddie Chen Sent: Friday, March 18, 2011 5:10 PM To: LINUX-390@VM.MARIST.EDU Subject: Re: Server rebooting after doing a CP Q DA from the console After you issue the cp query, did you disconnect? -----Original Message----- Mauro Souza <thoriu...@gmail.com> wrote: I saw this problem some time ago with an Oracle RAC guest. It haven't set the CP SET RUN ON, and as soon as the client issued some #CP Q SOMETHING, the server froze down, and linux rebooted. Looks like Oracle RAC have some kind of watchdog, and as CP MODE stops running Linux kernel for a little moment, the watchdog thinks the system froze down, and reboots the system. Setting RUN ON solved the problem. You can try this, it won't hurt, and I think RUN ON should be the default. Martin Schwidefsky <schwidef...@de.ibm.com> wrote: There is the important hint: if you have Oracle RAC and the watchdog is running the z/VM guest may not stop for longer periods of time. My guts feeling is that the large output of the #CP Q <xyz> command stopped the linux guest for too long. Once the output completed the guest continued and the Oracle watchdog did what it is programmed to do: reboot. Alan Altmark <alan_altm...@us.ibm.com> wrote: Regardless, when output comes to the console, there is no buffering, even if it thousands of lines long. That's ok since the output doesn't go through the virtual machine OS, but directly from CP to the 3270. Only the 3270 PA1 key (the default "break" key) will stop the output. CP QUERY TERMINAL to look at the BRKKEY setting. Pressing the break key will cause CP to put up a CP READ, canceling any pending output. If #cp had in fact been caught by CP, not Linux, there would have been no buffering, no error message, and no server abend. Ergo, #cp was not caught by CP. Rob van der Heij <rvdh...@gmail.com> wrote: So we're talking about virtual-MP in both cases? Are both also using cpuplugd to vary off CPUs maybe? Setting RUN ON will only prevent the CP READ upon reconnect. You should not need to reconnect a perfectly runing system. With RUN ON you may get buried in console output that prevents you from doing what you came for. I recommend to have RUN OFF and be aware of the CP READ when you have to reconnect. -----Original Message----- From: Linux on 390 Port [mailto:LINUX-390@VM.MARIST.EDU] On Behalf Of CHAPLIN, JAMES (CTR) Sent: Friday, March 18, 2011 5:07 PM To: LINUX-390@VM.MARIST.EDU Subject: Server rebooting after doing a CP Q DA from the console Found a problem today with CP QUERY command that caused our Linux Server to reboot. Using vmcp from a zLinux server, I issued the following command: vmcp q dasd | less Binary file (standard input) matches Error: output (21282 bytes) was truncated, try --buffer to increase size This guest has a large number of DASD attached to it (Oracle database) causing this problem. (Should have used the 'vmcp -b nnnn q dasd | less') But I thought I would try the same command from the guest console (#CP Q DA), and got the following response just before the server rebooted: DASD 4886 ON DASD 4886 R/W VI1304 SUBCHANNEL = 014C DASD 4887 ON DASD 4887 R/W VI1305 SUBCHANNEL = 014D Error: output (21282 bytes) was truncated, Two questions as I am a VM rookie, How to you modify the buffer from the console for the CP command? How do you display the buffer size available for a CP command? Also: Why would a query command on a console bring down a linux guest, but vmcp query does not? Is this a know bug? James Chaplin Systems Programmer, MVS, zVM & zLinux ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/ Please consider the environment before printing this email. Visit our website at http://www.nyse.com **************************************************** Note: The information contained in this message and any attachment to it is privileged, confidential and protected from disclosure. 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