Hi Experts, We have upgraded SQL Server 2014 Alwayson and we are getting issues on cluster sudden failures. the cluster fail-over happening suddenly and getting resolved automatically after sometime. please see the below cluster event error messages and guide me how can I resolve those issues.
1. Cluster node 'ABC' was removed from the active failover cluster membership. The Cluster service on this node may have stopped. This could also be due to the node having lost communication with other active nodes in the failover cluster. Run the Validate a Configuration wizard to check your network configuration. If the condition persists, check for hardware or software errors related to the network adapters on this node. Also check for failures in any other network components to which the node is connected such as hubs, switches, or bridges.
2. File share witness resource 'File Share Witness' failed to arbitrate for the file share '\\xyz20p\srv23pQuorum$'. Please ensure that file share '\\xyz20p\srv23pQuorum$' exists and is accessible by the cluster.
3. Cluster resource 'File Share Witness' of type 'File Share Witness' in clustered role 'Cluster Group' failed. Based on the failure policies for the resource and role, the cluster service may try to bring the resource online on this node or move the group to another node of the cluster and then restart it. Check the resource and group state using Failover Cluster Manager or the Get-ClusterResource Windows PowerShell cmdlet.