Hmm. Thirteen years ago I was part of a small team (4) bootstrapping multipath support for SAS devices on a new platform. Distributed between Beijing, Melbourne and Brisbane we had a very interesting time discovering some foibles between our default platform and the new one.
My task was to ensure that we could boot with the new drivers. Our boot architecture at the time was ... intricate, and I had to figure out some rather gnarly ways to go from single-path to multi-path and back again without losing device path configuration info.
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