Re: libata: set queue SSD flag for SSD devices

Jens Axboe
2008-10-11T06:47:03Z

On Fri, Oct 10 2008, Arjan van de Ven wrote:
> On Fri, 10 Oct 2008 22:05:28 +0200
> Jens Axboe <jens.axboe@oracle.com> wrote:
> >
> > In this specific patch, it'll do no harm at least since I very much
> > doubt we'll see a false positive. And even if, the consequences wont
> > be dire. But it does want the version check, of course.
> >
>
> also, is "is an ssd" the right question or is "doesn't have seek
> latency" the right one?
> (difference is.. well EMC boxes with lots of ram etc)

The block layer uses the 'non rotational' nomenclature for this, but
that's not perfect either. And neither is 'no seek', a single
"parameter" is not enough to describe the device. But it's good enough I
think, it'll be expanded later with a (bit) fuller profile.

--
Jens Axboe