Jan Engelhardt schrieb am 2006-02-03:
> >
> >> You CAN'T have multiple cdrecord processes burning the same disc at the
> >> same time; the very idea makes no sense. The O_EXCL just prevents you
> >> from trying such foolishness and creating a coaster.
> >
> >It does not prevent you from creatig a coaster in case you connect e.g.
> >two ATAPI writers to the same ATA cable.
> >
> Apart from transfer speed issues and potential buffer underruns coming
> along with that, is there anything technically impossible with writing to
> two ATAPI drives at the same time?
Bus locking while waiting for command completion. If you start a
long-lasting operation on one device, the other device on the same cable
is blocked so you cannot feed the other.
Same holds for SCSI if one of the devices involved doesn't disconnect
from the bus for that long-lasting command.
Try for instance "eject /dev/hdc" while writing to /dev/hdd, or same
stuff with sr0 and sr1. Been there, done that, got a coaster.
--
Matthias Andree
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