06-15-2005
I am not quite sure whether we are on the right track, without further metrix posted. Even a default ext3 config is not likely to be the bottleneck of this wait i/o issue. What about RAID strip unit size? What about NFS options (noac, cache, rsize, wsize, etc)? Especially noac. I am quoting related section from nfs man page:
----------------------------------------------------------------------
noac Disable all forms of attribute caching entirely. This
extracts a server performance penalty but it allows two
different NFS clients to get reasonable good results
when both clients are actively writing to common
filesystem on the server.
-------------------------------------------------------------------------
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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)