Attributes cached several hours. Time-based cache consistency may cause inconsistencies to occur. Attributes cached 3-30 seconds. Network traffic reduced by callbacks, large buffers. Network traffic increased by limited caching.
Replicas spread the load among preferred servers.
No replication to reduce load. No replication to reduce load. Excellent performance in wide-area configurations. Inefficient in wide-area configurations. Availabililty Read-only replication by volume.