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Re: [Xen-devel] Exporting "SD" device.

P M, Priya wrote:
We have Intel VT enabled system loaded with Xen 3.0.2 and qemu based FC5+linux 2.6.16 as a guest operating system. We want to export the disk to the domain 1 (FC5_linux 2.6.16) as "SD" device. But we are not able to export the SCSI disk as a SD device, we could export as a "HD" device. In the Configuration file,

disk = [ 'file:/home/adteam/linux_fc5_2.6.16,ioemu:hda,w',*'phy:/dev/sdd,ioemu:hdb,w'* ]

if we use ioemu:hdb, then the device is exported to the domain 1 and we could see the device.

ioemu:hdb is the syntax for FV devices. For FV, we only currently support exposing as IDE devices.

If we use

disk = [ 'file:/home/adteam/linux_fc5_2.6.16,ioemu:hda,w',*'phy:/dev/sdd,/dev/sdb,w'* ]

This is only valid syntax for PV domains.

/dev/sdb, then the device is not seen on domain 1.

Are we missing something. Is it not possible to export an SD device to domain 1? Is there any limitiation in qemu based domain 1, because our domain 0 is qemu based operating system.

Is there any performance difference between "hda" and "sda" exported devices???

There is no support for SCSI emulator ATM. It is on the Roadmap though and it ought to have a pretty significant performance impact. It's going to take a fair bit of time to realize that though.


Anthony Liguori



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