On Tue, 2018-07-24 at 08:00 +-0200, Hannes Reinecke wrote: +AD4- So, have you tested that request-based multipathing works on a partition +AD4- +AF8-at all+AF8-? I'm not sure if partition mapping is done correctly here+ADs- we +AD4- never remap the start of the request (nor bio, come to speak of it), so +AD4- it looks as if we would be doing the wrong things here. +AD4- +AD4- Have you checked that partition remapping is done correctly? I think generic+AF8-make+AF8-request() takes care of partition remapping by calling blk+AF8-partition+AF8-remap(). generic+AF8-make+AF8-request() is called by submit+AF8-bio(). Is that sufficient to cover all dm drivers? Bart.