Just a random thought: if two devices have same IDs and seem to work in
turns,
are you certain you have a mirror and not two paths to the same backend?
A few years back I was given to support a box with "sporadically failing
drives"
which turned out to be two paths to the same external array, and
configuring
MPxIO failover properly helped the system detect them as being actually one
device and stop complaining as long as one path works.
On another hand, you might have some "dd if=disk1 of=disk2" kind of cloning
which may have puzzled the system...
HTH,
//Jim
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