[PATCH/RFC] NVMe: add support for doing offline/online of attached namespaces

[Christoph Hellwig]

On Fri, Jan 23, 2015 at 10:39:38AM -0700, Jens Axboe wrote:
> For the per dev host/sdev busy counters, those could be further improved if
> they turn out to be a problem. I've got various "things" here that'll do
> 1-2M IOPS per dev, so some test/profiling would not be a problem to do.

We've tested up to 3M IOPS and it wasn't an issue, but none of these
systems had more than two sockets.

> First issue is support for > 1 hw queue in SCSI, though.

We've added > 1 queue support for virtio-scsi and srp, but most HBAs lack
the hardware support for it.