[Beowulf] how fast can NFS run?

Bruce Allen ballen at gravity.phys.uwm.edu
Tue Jan 31 23:13:21 EST 2006


I'd like to know the fastest that anyone has seen an NFS server run, over 
either a 10Gb/s ethernet link or a handful of link aggregated 
(channel-bonded) Gb/s ethernet lines.

This would be with a small number of clients making large file sequential 
reads from the same NFS host/server.  Please assume that the NFS server 
has 'infinitely fast' disks.

I am told by one vendor that "NFS can't run faster than 100MB/sec".  I 
don't understand or believe this.  If the server's local disks can 
read/write at 300MB/s and the networking can run substantially faster than 
100 MB/s, I don't see any constraint to faster operation.  But perhaps 
someone on this list can provide real-world data (or say why it can't 
work).

Note: I am free to use modern versions of the NFS protocol, jumbo frames, 
large rsize/wsize, etc.

Cheers,
 	Bruce
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