Il 31/05/2012 10:44, Roni Luxenberg ha scritto: > a continuous replication application expects to get all IOs in the same order > as > issued by the guest irrespective of the (rate of the) flushes done within the > guest.
Does real hardware give such consistency, unless you disable caching? > This is required to be able to support more advanced features like cross VM > consistency > where the application protects a group of VMs (possibly running on different > hosts) > forming a single logical application/service. > Does the design strictly maintain this property? No. But this is only a problem with the implementation, not with the API. > under this design and assuming async implementation, is a same block > that is written few times in a raw by the guest guaranteed to be > received by the continuous replication agent the same exact number of > times without overriding any of the writes? No. Paolo
