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Hardware problems (Score:2)
Years ago, some friends of mine had a couple of PDP-11s (mostly PDP-11/34's but there was enough to run a PDP-11/44 or two from various parts). The main RK07 disk controller worked fine, but it would flake out every few weeks.
How to fix it? Replace the mostly-working RK07 controller with the RK07 Voodoo Controller(tm). Boot once, and watch the Voodoo Controller fail. Replace the Voodoo controller with the mostly-working controller and reboot. Then stand back an
probably a marginal CPU (Score:2)
I had a sparc 20 watchdog every night for a month on a particular SAS job...finally replaced both CPUs and that did the trick. Next time ask them for a t-patch for the kernel to trap the exceptions or just have them replace the CPUs up front as it's a waste of time hunting down this sort of problem that, while rare, isn't so rare as to wish the waste of time hunting it down. Also, you could, if you had multiple CPUs either bind the installer to a CPU or, using psradm, pull them offline one at a time to see