Re: Hot plugging of SATA disks doesn't seem to work under NetBSD-4.x?

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Tue, Apr 15, 2008 at 07:19:33PM +0000, Jonathan A. Kollasch wrote:
> On Tue, Apr 15, 2008 at 01:29:37PM +0200, Manuel Bouyer wrote:
> > On Mon, Apr 14, 2008 at 01:59:45PM -0700, Brian Buhrow wrote:
> > > 2.  If not, has anyone looked at what changes are required to make this
> > > functionality work?
> > 
> > For controllers exposing the native SATA interface, I'm not sure yet
> > what would the best way of doing it. The PHY will signal devices going
> > in and out and we could use this, just as with USB. But this could mean that
> > a trancient connection error could end up with a drive going away and
> > back, which is bad for the system (for the system this would just be a new
> > drive, and mounted filesystems wouldn't be connected to the drive any
> > more).
> > The other option is to implement an atactl detach/scan, just as scsictl
> > does. I started working on this some years ago and some bits are there.
> > I didn't complete it because I didn't find a sane way to handle a rescan of
> > a PATA bus with master/slave, with one of the devices already present.
> > As SATA is p2p, this makes this part easier.
> 
> What about what the IEEE 1394 subsystem does at least with
> sbp(4) devices?   The bus has to be reset a few times before
> an attached sbp(4) disappears.

I guess we could do it for SATA too, it's easy to do at the PHY level.
What I'm not sure is how this would work with a port replicator.

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
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