Should NVME_SC_INVALID_NS be translated to BLK_STS_IOERR instead of BLK_STS_NOTSUPP so that multipath(both native and dm) can failover on the failure?

[Christoph Hellwig]

On Tue, Jan 30, 2024 at 01:29:33PM +0200, Sagi Grimberg wrote:
> As mentioned, afair (Hannes can correct me if I'm wrong) you can
> make an nvmet subsystem span more than 1 server assuming that the
> backend device is consistent (i.e. using drbd). The only thing that
> you need to pay attention is that the cntlid range is not overlapping
> in each of the servers that expose the nvmet subsystem (cntlid_min/max
> configfs attributes).

You can even make a subsystem span multiple "servers" without shared
storage, but in that case you'd better now allow simultaneous access to
any given namespace through path pointing to the different "servers".
ANA comes in pretty handy for that.