[mythtv-users] Recording/playing back same file via NFS

George Mari george_mythusers at mari1938.org
Mon Aug 13 13:09:52 UTC 2007

Billy Macdonald wrote:
> On 8/12/07, Brad DerManouelian <myth at dermanouelian.com> wrote:
>> I know the drive's limits aren't being reached because I can record 1
>> HD + 2 SD recordings and watch HD all at the same time from this one
>> drive as long as the HD program I'm watching is not the one that's
>> recording. Also, this problem happens when recording only 1 SD
>> program locally on the master backend and trying to watch it from the
>> remote frontend.
>> It seems like there's some weird seek latency while reading from and
>> writing to the same file over NFS or while streaming from the master
>> backend. I was hoping for some magic setting that I missed that would
>> improve NFS caching to fix that or whatever.
> This sounds like more of an issue with MySQL and the seek table than
> with NFS or networking.  I don't have a solution for you
> unfortunately, but I would suggest that it's not an issue with your
> network speed.
> The one network issue is does your NFS mount go through the external
> IP?  I notice that the machine name in your fstab resolves to an
> external address for me.  does your frontend resolve that to an
> external address as well?  It should likely go to an internal address.
> Good luck.
Yeah, I hadn't thought of MySQL - that could be a factor, also.  You 
could try re-building/repairing your tables, if you haven't already.

Another idea - to confirm or rule out NFS, you could try playback 
without NFS, just using the MythTV protocol.

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