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A Microsoft cluster shared volume (CSV) is a shared data volume that is initially formatted as NTFS or ReFS. When you add the volume to a failover cluster as a CSV, the file system is changed from NTFS or ReFS to Cluster Shared Volume File System (CSVFS).
A CSV enables concurrent read and write access from multiple server nodes regardless of which server node in the cluster owns the CSV.
Network redirection is an integrated resiliency feature that CSVs use to improve fault tolerance. The node that owns a CSV can redirect data I/O over the network to other server nodes if the other server nodes lose data path I/O access to the CSV. However, network redirection injects latency that will degrade performance. Network redirection is meant to be a temporary means of allowing I/O to continue. Resolve the issue that is causing network redirection as soon as possible.
Optimize CSV resiliency when using nonuniform server mappings. Make sure that a server node at the preferred Metro Volume site (Site A) owns the CSV. In this way, if the CSV goes into Network Redirected mode, the CSV owner is already at the preferred site.