On Tue, 31 Jan 2006, 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.
The netapp r200 we have serving user data pushes a peak of around 150MB/s,
it has periods where the ten minute average will approach 100MB/s. Qith a
similar sized r200 and a smaller number of clients in the POC lab at
netapp while evaling the hardware we got the thing to deliver order of
220MB/s. This is 56 x 300GB drives. certainly they sell bigger faster
filers than the ones we presently have.
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.
Disks aren't infinitely fast and do play a substantial part in the whole
problem space, frankly if replacing them with silicon was cost
effective I would, as it is we use bigger slower disks for almost all
of our file server applications, just because we need the capacity/cost
equation to balance out...
There are a lot of impediments to decent nfs performance, if you have an
issue you get to play hunt the bottleneck, test, tune and repeat.
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).
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