On Wed, May 16, 2012 at 12:05:51PM +0900, MORITA Kazutaka wrote: > > flushing the cache, we already have mechanism to to do this, qemu-io -c > > "flush". > > IMHO, the uppler layer should assume that the underlying one provides > a block storage semantic to simplify the implementation. And > actually, there is no other block driver in QEMU and OpenStack which > needs a flush request to read the latest data from another node. Actually there is in QEMU - it's file backed images on NFS for certain coner cases, and they are a massive PITA to handle, last time I checked with Redhat-private patches not even in upstream qemu for live migration. |