A obsolete MQ channel option saved the day

After recovering from a site-wide power failure and restart, something then went wrong with my AIX system so that I could no longer log into it. It seemed that the ssh service had died. And none of the other standard Unix services like telnet were enabled for security reasons. I’ll show how I was able to recover, and how an obsolete MQ channel option saved the day.

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This post was last updated on February 24th, 2022 at 11:10 am

Same location, different times

I was talking to someone tonight who said that it looked like there would be a new layer of bureaucracy applied to how their z/OS system was managed. It made me think of way back, when I first worked for IBM … Hursley’s “production” systems had a level of process and change control. Though as those boxes were all used for development activity it was still less hidebound than you might get (or hope for) in a banking datacentre. But our department had its own mainframe, under more local control. The sysprogs lived on the same corridor, and would do pretty much whatever you needed. Especially after a lunch meeting at the Dolphin.

And then I realised that our MVS system – probably an IBM 4381 if I remember right – was likely sited at pretty much where my desk is now. A desk which I’ve only seen a couple of times over the last year, but where I had to go yesterday after an area-wide power outage that had taken out an old desktop Linux box that would blow away that 4381 with its processing capability. Some of what’s now desks used to be a mini-machine room.

Linux desktop in Hursley
The Linux PC with more power than the mainframe that once sat here