On Tue, 27 Nov 2012 13:17:11 -0600, Andy Wood <[email protected]> wrote:
>On Mon, 26 Nov 2012 10:01:38 -0600, Mark Zelden <[email protected]> wrote: > >>. . . Things >>like PSA overlays, UCB overlays etc. Of course over the years IBM has added >>lots of code and features to repair critical control blocks and there are >>captured >>UCBs etc., so it less frequent. . . . > >The introduction of captured UCBs was a backward step from a system >reliability point of view, as it increased the chances of a UCB being >overlaid, and could make it very difficult to catch the culprit. The much >later Captured UCB Overlay Protection restored the reliability status quo. > Thanks for the clarification. That was what I was referring to. Yes, captured UCBs are ancient at this point. Without researching, I'm pretty sure it was MVS/ESA 5.2, but it could have been MVS/ESA 5.1 or OS/390 R1. -- Mark Zelden - Zelden Consulting Services - z/OS, OS/390 and MVS mailto:[email protected] Mark's MVS Utilities: http://www.mzelden.com/mvsutil.html Systems Programming expert at http://expertanswercenter.techtarget.com/ ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
