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b54c313c33
In cases when the destination storage is slower than the normal VM storage and the VM does intensive I/O to the disk a block copy job may never converge. Switching it to synchronous mode will ensure that all writes done by the guest are propagated to the destination at the cost of slowing down I/O of the guest to the synchronous speed. This patch adds the new API flag and implements virsh support. Signed-off-by: Peter Krempa <pkrempa@redhat.com> Reviewed-by: Ján Tomko <jtomko@redhat.com>