[Xen-users] which disk/tap device to use for xen?

[Michael Monnerie <michael.monnerie@xxxxxxxxxxxxxxxxxxx>]

Hi, the docs on
http://tx.downloads.xensource.com/downloads/docs/user/
do not mention at all which tap: should be used for xen. I've ggogled 
that file: is bad/ugly/horrible, and you should use tap:aio instead. But 
my blktapctrl (openSUSE 11.1, kernel 2.6.27.9) can do more:

BLKTAPCTRL[6249]: blktapctrl.c:797: Found driver: [raw image (aio)]
BLKTAPCTRL[6249]: blktapctrl.c:797: Found driver: [raw image (sync)]
BLKTAPCTRL[6249]: blktapctrl.c:797: Found driver: [vmware image (vmdk)]
BLKTAPCTRL[6249]: blktapctrl.c:797: Found driver: [ramdisk image (ram)]
BLKTAPCTRL[6249]: blktapctrl.c:797: Found driver: [qcow disk (qcow)]
BLKTAPCTRL[6249]: blktapctrl.c:797: Found driver: [qcow2 disk (qcow2)]
BLKTAPCTRL[6249]: blktapctrl.c:797: Found driver: [ioemu disk]
BLKTAPCTRL[6249]: blktapctrl.c:797: Found driver: [raw image (cdrom)]

So I guess possible would be tap:aio, tap:sync,and the others are 
specialized. But which one is the "best" to take. Stability/Reliability 
is most important, performance 2nd most.
Has anyone got a hint or link to docs? I'd be interested in qcow 
documentation also.

mfg zmi
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