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Full Discussion: using stat() on an NFS mount
Top Forums Programming using stat() on an NFS mount Post 302255106 by Perderabo on Wednesday 5th of November 2008 10:37:14 PM
Old 11-05-2008
Why do you care? If you hang you should jump for joy. After all, that is the behavior you requested when you mount an NFS filesystem with both the hard and nointr options. If you want different behavior, maybe you should just select the options you actually want.

It is possible to check to get a fairly good idea that an NFS operation should succeed. But this introduces a race condition. You check and see that all is cool. Then the server crashes. Then you try your NFS operation and hang. This is why this approach will never work 100%.

If you really want to go this route, you can use an rpc call to contact the NFS server to inquire of it's health. Calling procedure 0 is a common way to do this. Procedure 0 always succeeds and just exits to prove that the server is alive. The rpcinfo can do this. You can either invoke that program or download the source code from opensolaris to see how to do it.

But I would just set the intr option.
 

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LEARN ABOUT REDHAT

rpc.nfsd

rpc.nfsd(8)						      System Manager's Manual						       rpc.nfsd(8)

NAME

       rpc.nfsd - NFS server process

SYNOPSIS

       /usr/sbin/rpc.nfsd [-p port] nproc

DESCRIPTION

       The  rpc.nfsd program implements the user level part of the NFS service. The main functionality is handled by the nfsd.o kernel module; the
       user space program merely starts the specified number of kernel threads.

       The rpc.mountd server provides an ancially service needed to satisfy mount requests by NFS clients.

OPTIONS

       -p port
	      specify a diferent port to listen on for NFS requests. By default, rpc.nfsd will listen on port 2049.

       nproc  specify the number of NFS server threads. By default, just one thread is started. However, for optimum performance  several  threads
	      should be used. The actual figure depends on the number of and the work load created by the NFS clients, but a useful starting point
	      is 8 threads. Effects of modifying that number can be checked using the nfsstat(8) program.

SEE ALSO

       rpc.mountd(8), exportfs(8), rpc.rquotad(8), nfsstat(8).

AUTHOR

       Olaf Kirch, Bill Hawes, H. J. Lu, G. Allan Morris III, and a host of others.

								    31 May 1999 						       rpc.nfsd(8)
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