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. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
