persistent dns cache

I'm running pdnsd on 127.0.0.2 and named listening on all interfaces with forwarders set to pdnsd. This way (it seems) I get all the functionality of BIND with persistent disk-backed caching.

I've been thinking about sharing caches between regular BIND 9.x servers. Each server can have a view for all the other servers with no forwarders and a view for clients with forwarders set to all the other servers. This way, with two servers the cache is fully replicated. If one of the servers loses its cache, it's still able to resolve very quickly using the other server's cache.