Daniel P. Berrange wrote:
That doesn't work in the case of setting up a clustered filesystem
shared between guests. That requires that the disk be opened writable,
but with a shared (F_RDLOCK) lock.
If you'd like data corruption :-)
qemu -drive file=/dev/hda,lock=shared # clustered file system
qemu -drive file=/dev/hda,lock=shared # clustered file system
qemu -drive file=/dev/hda,lock=shared -snapshot # i have no awareness
of the last two.
The 3rd invocation is totally fine. /dev/hda is shared (but the
expectation is read-only).
Better to stick with on/off. That gives much easier to understand
semantics.
Regards,
Anthony Liguori
