Re: devfs persistence

From: Rodger Wilson {I/O Software} (Rodger.Wilson@central.sun.com)
Date: Sat Apr 29 2000 - 23:39:39 EST


On Sat, 29 Apr 2000, Richard Gooch wrote:

> Matthew Jacob writes:
> > > > This is why I stand by what I said- the driver (or some midlayer)
> > > > has got to either assure a address constant to the app or fs layer
> > > > while the system is running or send back an I/O error if it can't.
> > >
> > > But will the disc *I* plug in have the same host,bus,target,lun?
> > > And if not, how on earth do I find out what the unique identifier is?
> > > I've just walked downstairs and plugged in 5 new discs, meantime
> > > someone in another building has plugged in another 5 new discs.
> > >
> > > Which are mine?
> >
> > The ones with the WWNs you've written down :-).. Seagate && other
> > folks should be putting WWNs on the disks themselves- I haven't seen
> > them there, but maybe they're starting to do this- some HBA vendors
> > do this for their cards' WWNs.
>
> *IF* the WWNs are written on the discs, then we're fine. All (ha!)
> that is needed is that the SCSI subsystem detects insert and remove
> events and can probe the WWN. Then it's trivial to expose in
> /dev/scsi/wwn/

Exactly!!!

Rodger>

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