This applies to both interfaces and all nodes in the cluster. Additionally, you can configure how many ARP ping timeouts are received before marking the interface as down. Note: The ARP timeout value is configurable from the network settings page for each interface. If there is still no response, the PCS marks the interface as down.
If after 5 seconds, no response is received, the PCS begins a wait period of 45 seconds. The PCS will wait up to 5 seconds for a response. This ARP message is sent every 5 seconds. What are the ports used for PCS clustering?ĭo the active nodes monitor the state of their own interface?Įach node monitors both of it's interfaces by sending an ARP who-has (ARPing) to the default gateway. This does not allow for session or user data synchronization. This option allows for only the configuration elements to be synchronized. Session IDs and user data are synchronized, if enabled. Node-specific options, such as IP addresses, VLANs, et cetera (please see the admin guide for full list), will NOT synchronize among nodes and will be used only locally. Synchronization still takes place in A/A and can be configured with configuration sync only. In an A/A configuration, there is no VIP, and the PCS relies on an external load balancer if the load is to be distributed among PCS nodes. In the event that a node has not sent an update (timeout being the gateway's ARPing timeout + 5 seconds) the standby node in an Active/Passive cluster will assume the VIP (failover).
Status is reported on the clustering page. Each node in a cluster is in near-constant communication with the other to ensure they are all active and there is data synchronization as well, so all nodes know each other's status and all nodes have the latest configuration, including user sessions (DSID cookie values), bookmarks, system settings, etc. The other node in the cluster would be slave node at this time.
In an A/P configuration, the PCS uses a Virtual IP (VIP) which floats among the nodes and is owned by only one node - the master.
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