You can also have look at: https://www.ovirt.org/develop/troubleshooting-nfs-storage-issues.html
There is an nfs-check.py utility to help troubleshoot

On Fri, Feb 15, 2019 at 8:08 AM Jinesh Ks <jinu999@gmail.com> wrote:
Host Node3 cannot access the Storage Domain(s) <UNKNOWN> attached to the Data Center Default. Setting Host state to Non-Operational.

VDSM Node3 command ConnectStoragePoolVDS failed: Cannot find master domain: u'spUUID=a171b7d6-2c10-11e9-acee-10604b98fee8, msdUUID=bb73461e-02a2-45a6-85fa-5e39d860485c'

The error message for connection 10.0.10.11:/exports/data returned by VDSM was: Problem while trying to mount target
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we have 3 Nodes, using NFS  for storage domain... using shared data center.

Anybody can help me?
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