Yes, dm-cache is not new, but it just had a major new release. It now has a feature to allow many vms to share one cache. I can't speak for the flashcache team

Yes, dm-cache is not new, but it just had a major new release. It now has a feature to allow many vms to share one cache. I can't speak for the flashcache team, but I do know that one goal of the dm-cache team is to get it into the upstream for the linux kernel(I know this b/c I worked with dm-cache team last year).