On Sat, Oct 28, 2017 at 06:09:46PM +0800, Guan Junxiong wrote:

Does it mean some extra works such as:
1) showing the path topology of nvme multipath device

It's in sysfs.  And Johannes volunteered to also add nvme-cli
support.

2) daemon to implement immediate and delayed failback

The whole point is to not have a daemon.

3) detecting sub-healthy path due to shaky link

We can do this in kernel space.  It just needs someone to implement it.

4) grouping paths besides ANA

We don't want to do non-standard grouping.  Please work with the
NVMe working group for your grouping ideas.