[LSF/MM/BPF TOPIC] Native SCSI multipath support

[John Garry]

At ALPSS 25 I presented a proposal for Native SCSI multipath support. 
Let's discuss this topic at LSFMM.

The idea for this is that SCSI could natively support multipath, like 
how NVMe host driver does today. It is intended as an alternative to 
dm-multipath support.

I have been working on the implementation and I plan to post patches in 
the next cycle. I am looking at a 3-stage approach:
a. create a driver-agnostic multipath library, very heavily based on 
NVMe host multipath support.
The library would support features such as path management, path 
selection/iopolicy, failover recovery, PR, delayed removal, gendisk 
management etc.
b. switch NVMe over to use this library
c. add native SCSI multipath support based on this common library

Thanks,
John