[mythtv-users] Tips for user jobs on NFS mounts over Wi-Fi?

Dave MythTV dave.mythtv at gmail.com
Tue May 5 23:33:05 UTC 2015


Hello everyone.

Of course a fast wired network would be greatly preferred, but does anyone
have any tips for running high-bandwidth user jobs (transcoding, etc) on
remote backends which are connected via a Wi-Fi network?



My primary MythTV machine is a Frontend/Backend combo, with all of the
tuners, storage, etc, and it is working great.  However, I'm working on a
side project to transcode many years of recordings (~3 TB) to H.264 for
longer term archival and better compatibility with our tablets and other
portable devices.

In doing this, I'm going to be temporarily running tunerless remote
backends (really just mythjobqueue) on several other machines in the house
to help work through the backlog.  These machines are much more powerful
(2-5x so), but will only have a Wi-Fi connection to the master backend with
the storage drives.


I have one remote backend up and running, but I'm starting to suspect that
network I/O will ultimately limit the scalability and overall transcoding
speed - particularly once I get a second remote backend configured.


I'm thinking of modifying my user job scripts, so that instead of
transcoding directly to/from the NFS mounted drive, they instead copy the
entire recording to local storage, do the transcode locally, and then copy
the entire transcoded result back to the NFS share.   My theory is that
this will make the network transfer more efficient, and prevent the
transcoding processes from stalling constantly while waiting on network
I/O... but it's just a theory.  I could also see it being slower in some
cases, as it has to wait for the entire file to be received before it can
start any of the CPU-heavy transcoding work.  So I'm not sure which would
be more effective.


Has anyone worked within this situation, and do you have any advice?  :-)

Thanks
- Dave
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