On Thu, May 31, 2018 at 11:37:20AM +0300, Sagi Grimberg wrote: >> the same host with PCI NVMe could be connected to a FC network that has >> historically always been managed via dm-multipath.. but say that >> FC-based infrastructure gets updated to use NVMe (to leverage a wider >> NVMe investment, whatever?) -- but maybe admins would still prefer to >> use dm-multipath for the NVMe over FC. > > You are referring to an array exposing media via nvmf and scsi > simultaneously? I'm not sure that there is a clean definition of > how that is supposed to work (ANA/ALUA, reservations, etc..)
It seems like this isn't what Mike wanted, but I actually got some requests for limited support for that to do a storage live migration from a SCSI array to NVMe. I think it is really sketchy, but if doable if you are careful enough. It would use dm-multipath, possibly even on top of nvme multipathing if we have multiple nvme paths.
