红帽全球峰会第 4 章 基于 ABAP 平台 1709 或更早版本的 NetWeaver 或 S/4 的 HA 解决方案
4.1. 独立 Enqueue Server 1 (ENSA1)
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使用旧的 Standalone Enqueue Server (ENSA1)时，ASCS 实例必须故障转移运行活跃 ERS 实例的集群节点，且必须确保关闭 ERS 实例并移到其在线时运行 ASCS 实例的节点。这是因为 ASCS 实例必须访问共享内存，其中 ERS 实例维护 enqueue 锁定表的副本，以继续跟踪活动事务的 enqueue 锁定。pacemaker 中支持 ENSA1 作为双节点集群配置，主要是因为 ASCS 实例必须"跟进" ERS 实例的限制。
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