Robert Mustacchi sent a response about just this, they have the subsystem components:-

"We have some bits that add the underlying ioctl for the solid state
detection here:

https://github.com/joyent/illumos-joyent/commit/281d692636513b749e11b75b758cd009114b2216

I'll work on getting that up into illumos shortly which should get you
what you need at least for solid state support. I don't have anything at
the moment for exposing the rpm, but I can certainly try to help with that."

So I'll wait for this and then wire it up yes :)

   Regards
   Steve

----- Original Message ----- From: "Matthew Ahrens" <[email protected]>
To: "illumos-zfs" <[email protected]>
Cc: "Steven Hartland" <[email protected]>; "developer" 
<[email protected]>
Sent: Thursday, November 21, 2013 4:24 AM
Subject: Re: [OpenZFS Developer] [zfs] Review: 4334 Improve ZFS N-waymirrorread 
performance


I assume that this is just a preliminary review, and before pushing you'll
be adding code to detect if the device is a SSD and set vdev_rotation_rate
to VDEV_RATE_NON_ROTATING?

--matt


On Wed, Nov 20, 2013 at 4:23 PM, Steven Hartland <[email protected]>wrote:

Webrev updated as per feedback:
http://cr.illumos.org/~webrev/steveh/illumos-4322/

Changes:
* Renamed lastoffset vars and methods so they are
 less like the new lastoffset vars added in the
 queuing rework.
* Removed static declaration on tunables.
* Corrected vdev_queue_length calculation to be
 compatible with latest multi queue logic.
* Added requested comments.


   Regards
   Steve


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