NFSManager
Expert Options panel 
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Use this panel to set mounting and buffering parameters when you import a directory.

The default values appear when you first open this panel. If you change them, the new values appear in the opts property for the directory. The default values are never listed for opts. 

You click the Expert Options button in the Imported Directories window to open this window. 

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Mount timeout is represented by mmttimeo.
Mount retries is represented by retry.

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NFS timeout is represented by timeo.
NFS retries is represented by 
retrans.
Read buffer size is represented by rsize.
Write buffer size is represented by wsize.