Re: [PATCH 8/9] nvme: implement multipath access to nvme subsystems

[+Cc Hannes ]

Keith Busch [off-list ref] writes:

On Mon, Sep 25, 2017 at 03:40:30PM +0200, Christoph Hellwig wrote:

quoted

The new block devices nodes for multipath access will show up as
=20
	/dev/nvm-subXnZ

Just thinking ahead ... Once this goes in, someone will want to boot their
OS from a multipath target. It was a pain getting installers to recognize
/dev/nvmeXnY as an install destination. I'm not sure if installers have
gotten any better in the last 5 years about recognizing new block names.

We discussed (Hannes, Christoph and me) this as well offline this week
and it should eithr be possible with some udev magic (fake a
/dev/mapper/WWID symlink) or a shim device-mapper target that prevents
dm-mpath from attaching to the underlying block devices and creates a
real /dev/mapper/WWID device node (Christoph especially dislikes
this). None of them are pretty, but probably all we can do so far.

Byte,
        Johannes

--=20
Johannes Thumshirn                                          Storage
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