為什么80%的碼農都做不了架構師？>>> ??

早期的RAC，可能會出現因為private IP所用的網卡有問題，導致節點脫離集群，或者因為受網卡帶寬的限制，影響集群的性能。11.2.0.2版本開始，最多可支持4個冗余的private IP。防止單點故障的同時，也同時進行網絡傳輸的負載均衡。

You can define multiple interfaces for Redundant Interconnect Usage by classifying the interfaces as private either during installation or after installation using the oifcfg setif command. When you do, Oracle Clusterware creates from one to four (depending on the number of interfaces you define) highly available IP (HAIP) addresses, which Oracle Database and Oracle ASM instances use to ensure highly available and load balanced communications. The Oracle software (including Oracle RAC, Oracle ASM, and Oracle ACFS, all 11g release 2 (11.2.0.2), or later), by default, uses these HAIP addresses for all of its traffic, allowing for load balancing across the provided set of cluster interconnect interfaces. If one of the defined cluster interconnect interfaces fails or becomes non-communicative, then Oracle Clusterware transparently moves the corresponding HAIP address to one of the remaining functional interfaces.

轉載于:https://my.oschina.net/huayd/blog/127127

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