可用性指数 容错 Business continuance site 99999 4-Node Cluster 9999 Windows datacenter Server Replication 高 99.5 Application Data Management H 990 2-Node cluster 8.0 RAID/storage management 增强 Mirrored Set 965 基本 95.0 Backup 成本 2001可用性指数 95.0 96.5 98.0 99.0 99.5 99.99 99.999 100 % 基本 增强 高 容错 Backup Mirrored Set Mirrored Set Volume Management Volume Management 2-Node Cluster Node Cluster Application Data Management Application Data Management 4-Node Cluster Node Cluster Windows Datacenter Server Windows Datacenter Server Replication RAID/storage management RAID/storage management Business Continuance Site 可用性 成本