Re: [Qemu-devel] Re: [PATCH] virtio-blk: add SGI_IO passthru support

[Jamie Lokier]

Christoph Hellwig wrote:
> On Thu, Apr 30, 2009 at 10:49:19PM +0100, Paul Brook wrote:
> > Only if you emulate a crufty old parallel scsi bus, and that's just silly.
> > One of the nice things about scsi is it separates the command set from the 
> > transport layer. cf. USB mass-storage, SAS, SBP2(firewire), and probably 
> > several others I've forgotten.
> 
> It has nothing to do with an SPI bus.  Everything that resembles a SAM
> architecture can have multiple LUs per targer, and multiple targers per
> initiator port, so we need all the complex queing code, and we need
> error handling and and and.

If you're using virtio-block to connect to lots of LUNs on lots of
targets (i.e. lots of block devices), don't you need similar queuing
code and error handling for all that too?

-- Jamie