Re: really persistent SCSI device naming

[Martin Hicks <mort@wildopensource.com>]

On Thu, 2003-11-20 at 11:54, Greg KH wrote:
> On Thu, Nov 13, 2003 at 10:27:17PM -0500, Martin Hicks wrote:
> > 
> > Hello,
> > 
> > I have a need for very persistent SCSI device naming.  As I understand
> > the current SCSI device naming we have this:
> > 
> > Host:Channel:Target:Lun
> > 
> > If a new SCSI host is inserted into the machine, things move.  The
> > implementation that I'm trying to imitate with udev uses the above four
> > bits of info plus information regarding the position of the SCSI HBA
> > that the device is plugged into.
> > 
> > What is the best way to do this with udev?
> 
> Is there anything unique about your devices you can rely on?  scsi
> serial number?  vendor?  device type?  label id on the filesystem?
> 
> If you can find something, then use that in a udev rule.

I'll take a look at this sometime soon.  I've almost got the
early-userspace pieces working for me.

I think I really do want topology-dependent naming, but to the point
that "Host" (above) isn't good enough.  I don't want the host to change
when a new SCSI card is added into the system.  Replacing a defective
disk should not require fixing up /etc/udev/udev.config

mh

-- 
Martin Hicks                Wild Open Source Inc.
mort@wildopensource.com     613-266-2296




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