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Multipath doesn't handle this, and won't in RHEL6, at least. There's too many corner cases where things could go horribly wrong. That being said, while I don't that you should do this, you could see if running # service mulitpathd reload gets you the correct results. That deals with all the paths at once. However, multipath is designed around it's devices always having the same wwid, and breaking that assumption is not something you should do. You must remove the multipath device before changing the wwid of the path devices, for multipath to work correctly.