11-06-2009
IMO 'NFS as a unix service' means the NFS shares are supplied by a Unix server, 'NFS attached to NAS' means the shares are supplies by a NAS device (typically NetApp).
Direct NFS means the Operating Stack is bypassed and Oracle uses a raw TCP/IP socket and to handle NFS itself, which can lead to quite significant performance increases.. Direct NFS is also only supported with NFS attached to NAS.
Since you are setting up a test, you can set it up any way you like whether it is supported by Oracle or not. Just do not carry that setup over to production.
S.
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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)