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

V13
2004-08-07T10:29:55Z

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.

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