Hello,

I'm trying to conduct an experiment wherein I measure file-caching
performances over wireless connections. My basic setup includes one
client and two servers. In a nutshell, what the experiment does is to
make the client copy a fixed number of random files from a file pool
found in both servers. The client then caches the files it copies, so
the next time it tries to copy the exact file, it simply reads off the
cache. 

Since I implemented my own caching mechanism, I'd like to now decide on
how the network file transfers are to be made. I initially thought scp
would be sufficient, but I'd like to ask the mailing list's opinion on
using NFS. The problem with NFS however, is that it seems like it
already has it's own caching procedures (which in turn, may screw my
test results just like Coda did).

I heard of the ability to "disable nfs caching" from browsing the net.
However, I'm not sure of what this does exactly and whether it is
sufficient (there may be other caching procedures and NFS-related
factors that may affect my test procedure, not necessarily
file-caching). I plan to do more research on this, but I would highly
appreciate any additional insights. Thank you for your time.

-Paul Patrick Carpio Prantilla
University of the Philippines


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BTW, for those of you interested in what the point of the experiment is:
Everytime a file is cached, a priority value is assigned to the cached
object. This value derived from the  wifi connection strength between
client and server, size of the file, and the number of times the file
has been accessed in the past. The objective of my experiment is to
discover the optimal weights that should be assigned to these factors in
a wireless environment.

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