Re: PATCH: cdrecord: avoiding scsi device numbering for ide devices

[Bill Davidsen]

V13 wrote:
> On Saturday 07 August 2004 02:15, Martin Mares wrote:
>
> > Hello!
> >
> >
> > > Let me lead you to the right place to look for:
> > >
> > > 	The CAM interface (which is from the SCSI standards group)
> > > 	usually is implemeted in a way that applications open /dev/cam and
> > > 	later supply bus, target and lun in order to get connected
> > > 	to any device on the system that talks SCSI.
> > >
> > > Let me repeat: If you believe that this is a bad idea, give very good
> > > reasons.
> >
> > There is one: hotplug. The physical topology of buses where all the
> > SCSI-like devices (being it ATAPI devices, iSCSI, USB disks or other such
> > beasts) are connected is too complex, so every attempt to map them to the
> > (bus, target, lun) triplets in any sane way is destined to fail.
>
>
> Just to add on this, how is someone supposed to distinguish between two 
> identical USB recorders using the scanbus/X:Y:Z method? I suppose he'll have 
> to try writting to both drives each time he replugs them instead of 
> having /dev/cdr-red /dev/cdr-blue or something similar using hotplug/udev.

cat /proc/scsi/usb-storage/*

There is a utility (name escapes me) which allows binding of a NIC to a 
name by MAC address, it would be nice to be able to bind by serial 
number for IDE/SCSI/USB devices. However, until you do that, a simple 
script to create a few symlinks after discovery will solve your problem. 
Doesn't bug me enough to bother, but that's how.
--
   -bill davidsen (davidsen@xxxxxxx)
"The secret to procrastination is to put things off until the
 last possible moment - but no longer"  -me
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