![]() SMB clients from older OS versions will continue relying upon the SMB Witness to move to a more optimal server.Īs a note here, I wanted to point out when a move would and would not occur in a stretch scenario and it will depend on the storage you are using. Synchronous client redirection required changes in the SMB client, so only Windows Server 2019 and Windows 10 Fall 2017 clients can use this new functionality when talking to a Windows 2019 Failover Cluster. If it is redirected I/O, it will move the connection to the coordinator before I/O starts. If direct I/O is possible, it passes the connection on. The SMB Server service determines if direct I/O on the volume is possible. In Windows Server 2019, we are much more efficient. The SMB Witness service detects this lack of direct I/O and moves the connection to a coordinator. ![]() When using Storage Spaces on Windows Server 2016 and older, this behavior can be inefficient: if the connection is routed to a cluster node that is not the owner of the Cluster Shared Volume (aka the coordinator node), all data redirects over the network to another node before returning to the client. Scale-Out File Server (SOFS) relies on DNS round robin for inbound connections sent to cluster nodes.
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