Sorry, the title and content are wrong. I mean libvirt, not librbd. Ming-Hung Tsai <mingnus@xxxxxxxxx> : > > I'm curious that why librbd sets this limitation? The rule first > appeared in librbd.git commit d57485f73ab. Theoretically, a > write-through cache is also safe for VM migration, if the cache > implementation guarantees that cache invalidation and disk write are > synchronous operations. > > For example, I'm using Ceph RBD images as VM storage backend. The Ceph > librbd supports synchronous write-through cache, by setting > rbd_cache_max_dirty to zero, and setting > rbd_cache_block_writes_upfront to true, thus it would be safe for VM > migration. Is that true? Any suggestion would be appreciated. Thanks. _______________________________________________ libvirt-users mailing list libvirt-users@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvirt-users
