If NFS volume exported with root= option (allow root write access as root) and root on client cannot write a file on mounted NFS volume, flipping R/W permissions for a folder where NFS mounted may solve the problem.
Example: mysql prod slave mounted NFS from datastorage but during starting mysqd there was an error "Permissions denied" (procedure changes ownership of /var/lib/mysql under root). Setting permissions to 777 and back to 755 solved this problem.
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