[Sysadmins] NFS

[Avramenko Andrew]

man exports:
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      async:  This  option  allows  the NFS server to violate the NFS protocol and reply to requests before any changes 
made by that request have been committed to stable storage (e.g. disc drive).
              Using this option usually improves performance, but at the cost that an unclean server restart (i.e. a crash) can  cause  data to be lost or corrupted.

       sync:   Reply to requests only after the changes have been committed to stable storage (see async above).
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Какую использовать - решать Вам. Соответственно прописываются они в /etc/exports :)