Javier Guerra wrote:
i tried this looong ago and didn't really work because there was some
userspace cache on each QEMU instance. but the -drive option has a
'cache=off' setting that should be enough.
in theory (i haven't tested, but Avi 'blessed' it):
- create a new image with qemu-img
- add it to the command line using -drive file=xxx,cache=off on both
KVM instances
- use a cluster filesystem!
This won't work with qcow images as metadata and allocation is not
synchronized. Use raw images. cache=off is not strictly required,
since the Linux pagecache will maintain coherency.
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
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