[Info-vax] SBB power supplies failing slowly

[abrsvc]

On Monday, March 28, 2022 at 5:24:53 AM UTC-4, Phillip Helbig (undress to reply) wrote:
> I've seen this before, about a year ago, then it happened again in 
> another BA356: Disks go offline and into mount verification, then come 
> back after a minute or so. The process repeats every ten minutes. Of 
> course, being VMS, the cluster continues and practically nothing else is 
> affected, but it is annoying. 
> 
> Replacing the power supply solves the problem. 
> 
> I understand that a power supply can fail, but why is it failing in this 
> manner? Maybe overheating and shutting off then coming back on? 
> 
> Being VMS, I dismounted the shadow-set members in the box with the flaky 
> power supply. Thanks to minicopy, things were quickly back to normal 
> after replacing the power supply. To do that, I turned off the box, 
> replaced the power supply, and turned it back on. The node whose 
> system-disk shadow set was in the box didn't crash. 
> 
> I like VMS. 
> 
> Now to find a few more replacement power supplies. When collecting 
> SBBs, I concentrated on disks, and I think that I have enough of them. 
> Since the first power-supply failure wasn't until about a year ago, I 
> hadn't explicitly looked for them, but fortunately got a few with BA356 
> and other SBBs (mostly disks). 
> 
> I need the Top Gun Blue (that's really the official colour!) 180W 
> versions. If anyone has any in Scandinavia, Germany, Benelux, England, 
> Switzerland, Austria, Slovenia, or northwestern Croatia I could probably 
> collect them sometime this year, probably before autumn. Rest of the 
> Balkan: next year. 
> 
> I also plan to be in the southeast USA soon so would be happy to collect 
> there as well. (Apparently they run on 50 or 60 Hz and anything between 
> 100 and 240 volts.) 
> 
> It's mainly the power supplies I need, but I'll take any blue SBBs.

I have spares and can send you one.  Can you send me the failing one?  I can check to see the failure cause and hopefully repair it.
Contact me offline.

Dan