[OpenAFS] WAN speed

Lars Schimmer l.schimmer@cgv.tugraz.at
Thu, 22 Mar 2012 08:42:16 +0100

Hash: SHA1

On 2012-03-22 00:53, jukka.tuominen@finndesign.fi wrote:
> Forgot one thing:
> ...
>> For me the slowness in WAN is about latency.
> ...
> I've tried to address this with faster DNS, installing BIND etc,
> but with no notable improvement. Is this especially critical with
> OpenAFS, or possibly when transferring a high number of small files
> (like Firefox writing things to HD?).

For each file OpenAFS has to do at least one lookup on the fileserver
(across the local file cache on client). The more little files you
use, the more stats are in network queue, the longer it takes.
My 2 MB/sec was with files >2 GB which do still fit in local cache.
With very much small files the speed goes down to 100 kb/sec and less.

> Any idea how to improve this? At some point the system wasn't
> working outside LAN compaining DNS-related issues. Still, I'm not
> confident these settings are optimal.

My OpenAFS filkeserver options are:
parm /usr/lib/openafs/fileserver -L -udpsize 131071 -sendsize 131071
- -rxpck 700 -p 128 -b 600 -nojumbo -cb 1500000
parm /usr/lib/openafs/volserver -nojumbo -udpsize 131071

> br, jukka

Lars Schimmer
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TU Graz, Institut f=C3=BCr ComputerGraphik & WissensVisualisierung
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