Sorry, the title and content are wrong. I mean libvirt, not librbd. Ming-Hung Tsai <ming...@gmail.com> : > > 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.
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