IBM Mainframe Discussion List <[email protected]> wrote on 12/19/2006 10:52:44 AM:
> This did not happen to me, but the APAR sounds fairly serious. > > Apparently there is a problem where ACTIVATE can cause overlays within the > IOSAS address space. The APAR includes the RESTART/BOOT/IPL flag. > > The scope of the problem appears to be the latest z9 machines, and use of > the alternate subchannel set, and a circumstance happening where the code > needs to issue a message with the incorrect length set, and then overlaying > storage. > > I just hate for anyone to get into trouble (perhaps causing themselves an > outage) using a "routine" dynamic change facility within z/OS. For that > reason, Heads Up. The "who it happened to" was one of our z9 test systems (one where we do a lot of ACTIVATE testing, including very large changes affecting many thousands of devices). After the first instance of the overlay, I turned on the (undocumented) CSVRENTPROTECT trap. And despite running the ACTIVATE back and forth between the same two IODFs many times, it was several weeks before the problem reoccurred and hit the trap. So at least thus far, the problem has not been highly pervasive. But it is rather high impact (have to reIPL to get IOSAS functions working), so we thought it prudent to flag the APAR as HIPER. And if you intend to be doing ACTIVATEs which affect PAV aliases in the alternate subchannel set (which requires a z9 and at least z/OS 1.7), it would be prudent to install the PTF. Jim Mulder z/OS System Test IBM Corp. Poughkeepsie, NY ---------------------------------------------------------------------- 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
