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Mastering VMware® Infrastructure3But what if the node with the missing heartbeat was not really missing? What if the heartbeat was missing but the node was still running? And what if the node with the missing heartbeat is still locking the virtual machine files on SAN LUN, thereby preventing the other nodes from powering on the virtual machines? Let's look at two particular examples of a situation VMware refers to as a split-brained HA cluster. Let's assume there are three nodes in an HA cluster: Silo101, Silo102, and Silo103. Each node is configured with a single virtual switch for VMotion, and a second virtual switch consisting of a Service Console port and a virtual machines port group, as shown in Figure 10.38. Figure 10.38 ESX Server hosts in an HA cluster using a single virtual switch for Service Console and virtual machine communication. To continue with the example, suppose that an administrator mistakenly unplugs the Silo101 Service Console network cable. When each of the nodes identifies a missing heartbeat from another node, the discovery process begins ...» | Код для вставки книги в блог HTML
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