Oliver Neukum wrote:
I should be more specific.
Yes...
The SCSI is different for several reasons:
- we are talking about bus as well as device detection
- there's no common way to probe for devices
(the probing of LUNs works only on conventional busses)
So the SCSI stack needs to support more than one model for
device/bus detection. This can't be news. And some of them
have to handle "conventional" busses, like USB and PCI; maybe
even handle booting off them...
- many SCSI devices are not really SCSI devices. They just use
the command set
SCSI hotplug detection doesn't work for the same reason that USB
can handle only detection of devices by itself. Busses on the other
hand are not handled by USB itself.
Just how is it that USB doesn't handle USB? "B" == "Bus" ... :)
If you mean that HCs hook up to a different bus (often PCI), with its
own hotplug support, that doesn't seem so different from SCSI HBAs
hooking up to such busses (often PCI) and cascading the same hotplug
support...
Erm ... which of the three SCSI layers are you talking about? I was
talking about the highest level,..
In SCSI view device and bus disconnection is recognised by the lowest
level. As it knows nothing about the high layers, it notifies the midlayer
So you were talking past what I said about notifying that highest level,
not disagreeing with it.
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