If you are using a mirrored root under Disksuite and wish to enable mpxio I wish you well. It is a devil of a job, mainly due to the fact that stmsboot won't recognise your metadevice as a STMS device and so won't enable it.
So to fix it here is the answer:
- Back everything up. EVERYTHING
- Follow the guide here to undo the mirrored root
- Run stmsboot -e and reboot immediately
- Everything should now be correctly multipathed using mpxio
- Rebuild all the mirrored root and other devices
and next time, do the multipathing first and the mirroring afterwards!
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