Xsan: Inconsistent or missing name server records could result in unexpected Xsan Admin behavior (Apple KB)

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Xsan Admin and the file system manager (fsm) for Xsan may exhibit unexpected behaviors such as: Being unable to reach some clients; commands to unmount volumes, add clients, or remove clients take an unexpectedly long period of time; status updates take longer than expected before allowing further user control.

Read more: https://support.apple.com/en-us/HT200274