New
#11
@ sygnus21: it was APC Powerchute. Now that I know what the problem was (and it has not resurfaced since I took the RAID array off its power-down), I will probably reinstall it. I know that the greener setting is just an option, and I can keep the RAID active, even with the UPS software installed. I like the idea of checking the battery, and compiling failure stats.
@NoN: I never disabled the disk caching, because this system has always been on a UPS. The crazy thing about UPSs, you will have noticed, is that it is sometimes cheaper to replace the a unit with a new one, than it is to replace the battery of an older one. Lousy idea from an ecological standpoint, but that's capitalism as currently played. Anyway, this was a replacement system, and an upgrade to APC from a no-name system.
It is important also, I think, to note that the RAID 1 array was the one that generated the spurious? errors. My RAID 1 array slept without problems.