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Status Is a defect
Workspace z/TPF Product Family
Categories z/TPF
Created by Guest
Created on Nov 16, 2016

RELATED IDEAS

Allow z/TPF to run without consoles

Allow TPF to run if no consoles are available and an attempt to fallback to the HMC is not successful. Do not crash TPF, instead, send all console data to the RTA tape via TOURC for later on analysis. We have had conditions where TPF took a catastrophic CTL-A3 dump even though we have HMC fallback enabled and have successfully tested it, yet, there are times (during console flooding conditions for example) when a CTL-A3 dump may occur and no fallback to the HMC occurs, in which case, TPF goes down. We do not want TPF to go down.

If TPF detects that consoles are not available, TPF will set a condition that allows it to operate without consoles. If that condition is set and TPF soft-IPL's, TPF will continue to attempt to come back up to NORM state (if that was the state it was in prior to going down), and continue to send console writes to tape. Any console writes that occur before the system reaches NORM state are thrown away.

(e.g console writes by IPL, dump processing, during system restart, are just discarded and not written to tape). TPF just comes up if it can.

In order to bring consoles back to TPF a hard-IPL must be performed, in which case, TPF will need to find a console or the HMC in order to get through IPL.

Idea priority Medium
  • Guest
    Reply
    |     Jul 25, 2018

    This is not a defect. This is a request to remove the CTL-A3 catastrophic and ensure TPF can run if TOS servers are not reachable and does not establish proper communication with the HMC. TPF should consider doing what other robust mainframe operating systems do - those systems maintain a "log" of console messages that can viewed anytime. They do not require a console (but a console can be attached if desired). At the minimum TPF should either write console messages to a file or throw the message away, but TPF should *never* crash because it cannot find a console. The philosophy of TPF is "high availability", and having to go down when a console issue arises is counter to that direction. Thanks

  • Guest
    Reply
    |     Jan 13, 2017

    We need to determine why a CTL-A3 dump is received and no fallback to the HMC occurs. The dump is required for diagnosis.

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