Few more misc questions … Number of times re-architected ? My: 2 times – 1 time slave, 1 time memcached SN: site depend (many times over the year) FR: 2.5 (various clusters federated) FL: many cached replacements (about to do one change now) WK: Never (Spaghetti) FB: Every Tuesday, continual YT: Pretty continual, 2-3 times (replication, sharding, federation) What happens if server fails ? what act