[Beowulf] how fast can NFS run?

[Michael Will]

spec.org has a benchmark that is nfs-specific but it does not give you 
MB/s for a special access pattern.

Instead, it gives you operations per second as well as response time at 
that load
for a mix of different access patterns, filesizes between 1K and 1M.

http://www.spec.org/benchmarks.html#nfs

Bruce Allen wrote:

> 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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