Re: [Qemu-devel] [PATCH 10/13] Implement scsi device destruction

[Markus Armbruster]

Artyom Tarasenko <address@hidden> writes:

> 2009/9/25 Markus Armbruster <address@hidden>:
>> Gerd Hoffmann <address@hidden> writes:
[...]
>>> To extend that question:  While playing with that I've noticed linux
>>> does not automagically find the a scsi disk hot-plugged in.  After
>>> reboot (and the scsi bus rescan triggered by that) it finds the
>>> disk. Reloading the driver module probably would have worked too.  We
>>> don't signal the guest in any way it got a new disk, so this isn't
>>> exactly surprising.  Is this just a emulation limitation?  Or a
>>> limitation of the emulated scsi host adapters?
>>
>> What appens when you hotplug or just switch on a real SCSI device?  Does
>> Linux pick it up automatically?  Long ago when I last tried that, I
>> think I had to do a magic write to sysfs to make it look for the device.
>
> I guess it wasn't magic, but an official way of doing it. At least
> SCSI-2 controllers didn't get any notification signal on a hot-plug.
> I used to do it with
> echo "scsi add-single-device 0 0 3 0" > /proc/scsi/scsi

Call it "official magic" then ;)