On Fri, Mar 30, 2018 at 09:04:46AM +0000, Eric H. Chang wrote: > We internally call PCIe-retimer as HBA. It's not a real Host Bus Adapter that > translates the interface from PCIe to SATA or SAS. Sorry for the confusion.
Please don't call a PCIe retimer an "HBA"! :) While your experiment is setup to benefit from round-robin, my only concern is it has odd performance in a real world scenario with IO threads executing in different nodes. Christoph's proposal will naturally utilize both paths optimally there, where round-robin will saturate node interlinks. Not that I'm against having the choice; your setup probably does represent real use. But if we're going to have multiple choice, user documentation on nvme path selectors will be useful here.
