NFS Buffering

[Samuel Kidman]

On Tue, Sep 28, 2010 at 10:07 PM, Simon Andrews
<simon.andrews at bbsrc.ac.uk>wrote:

> I have a fedora 13 box on which I have a remote mounted nfs share over a
> fairly slow (10Mb/s) link.  I'm then transferring data onto this share
> from a different machine using scp.
>
> The problem is that after scp reports that it's 100% complete the
> program will hang for ~20 mins before it will move on to another file.
> At this point it can't be killed.
>
> It looks like the nfs daemon is caching write data (around 2GB of it)
> which lets scp think its finished when actually there's loads of data
> sitting in a write buffer.  The hanging is presumably the time it takes
> to flush the buffer (there is a process called nfsiod which is active
> during this time and df shows data is still being written).
>
> Does anyone know how to either make this buffer smaller, or get rid of
> it all together so the scp can accruately report on its progress?
>
> Thanks
>
> Simon.
>
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This Article <http://nfs.sourceforge.net/nfs-howto/ar01s05.html> contains
information on how to adjust the buffer size of NFS and optimise file
transfers. Also scp has a -C option to enable compression.
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