Verifique se o host atualizado ainda tem o compartilhamento NFS montado e que não está apenas gravando no disco local?
Você também pode tentar a opção noac
para o mount:
In addition to preventing the client from caching file attributes, the noac option forces application writes to become synchronous so that local changes to a file become visible on the server immediately. That way, other clients can quickly detect recent writes when they check the file's attributes.
Using the noac option provides greater cache coherence among NFS clients accessing the same files, but it extracts a significant performance penalty. As such, judicious use of file locking is encouraged instead.