On High Availability Systems

On High Availability Systems Item / Mechanism Backups M/S MM 2PC Paxos Consistency Weak Eventual Eventual Strong Strong Transactions No Full Local Full Full Latency Low Low Low High High Throughput High High High Low Medium Data loss Lots Some Some None None Failover Down Read only Read only Read/write Read/write This table essentially covers the foundational solutions for high-availability systems today. M/S and MM are not hard to implement, but have many issues. 2PC suffers from poor performance, while Paxos is too complex and difficult to implement.