The UPS associated with our server (at our hosting provider) developed a problem and failed, during an electrical storm. We are running CentOS 5.x.
Subsequently, after cominig back online, our server began crashing randomly but not infrequently. There seemed to be a problem with Interrupt 169 which pertains to the raid controller. The controller was replaced, but another crash occurred. The kernel was then rebooted with irqpoll. There was one additional 'soft lockup', but no crash, since that point.
Could a UPS failure cause this sort of problem?
(I'm new at this posting-questions thing, so have probably left a lot out.)