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e3ace39
(Get the code!)
> as I have known Linux, IDE disk devices have always been entirely predictable
They can switch around due to cabling, BIOS and driver changes. You've encountered the last one...
> Looks like you have to know the device names before you can assemble a RAID array - so UUIDs don't help much here.
Only if you are assembling the array by hand (e.g. a disk has been dropped). The final filesystem can be labelled like any partition (assuming the /dev/md? device was built). If md is working correctly it will be able to assembled the underlying partitions itself automatically (so it won't matter if you switch disks around etc).
Old documentation won't talk about filesystem labelling or UUIDs (because it wasn't around) so take a look at the age of the documents.