[mythtvnz] NFS performance not good enough?

[Pieter De Wit]

Hi,

On 5/06/2014 19:15, Worik Stanton wrote:
> I have a problem with my recordings not finishing.  On examining the
> logs I see that it is due to disk performance.  I am writing to a disk
> over NFS.  It should be able to take it, I thought, and these problems
> have only started recently.
>
> (See below for my logs and why I thing this is the problem)
>
> So I have 2 questions for this list:
>
> (1) Should I expect NFS to manage?  Searching the internet does not turn
> up many other people having problems.  I have got file caching turned on
> (using the 'fsc' option and cachefilesd.  (I'm turning that off now to
> see if it helps)
It should manage, but you need to tell us *way* more about your setup.
> (2) I have a local 32G ssd drive that is hardly used.  Can I get Myth to
> record to it and move the recordings later as a scheduled job to the NFS
> system?
Personally, I would avoid this as the ssd will wear out
> For example I recorded Back Benches and at 16:17 the recording just stops.
>
> The recording started at 22:29
>
> The log said (mythbackend.log):
>
> Jun  4 22:29:00 gently mythbackend[1425]: I Scheduler scheduler.cpp:2514
> (HandleRecordingStatusChange) Tuning recording: "Back Benches": channel
> 1010
> on cardid 5, sourceid 1
> Jun  4 22:29:01 gently mythbackend[1425]: I CoreContext
> scheduler.cpp:637 (UpdateRecStatus) Updating status for "Back Benches"
> on cardid 5 (Tuning =>
> Recording)
> Jun  4 22:29:01 gently mythbackend[1425]: I TVRecEvent tv_rec.cpp:3989
> (TuningNewRecorder) TVRec(5): rec->GetPathname():
> '/media/Recordings/1010_20140604222900.mpg'
>
> I assume it is writing to 1010_20140604222900
>
> I get a few messages like:
>
> Jun  4 22:42:50 gently mythbackend[1425]: W TFWWrite
> ThreadedFileWriter.cpp:499 (DiskLoop)
> TFW(/media/Recordings/1010_20140604222900.mpg:62): write(58280) cnt 90
> total 5226776 -- took a long time, 14230 ms
>
> Then the last mention of the file is:
>
> Jun  4 22:51:33 gently mythbackend[1425]: E DVBRead
> ThreadedFileWriter.cpp:216 (Write)
> TFW(/media/Recordings/1010_20140604222900.mpg:62): Maximum buffer size
> exceeded.#012#011#011#011file will be truncated, no further writing will
> be done.#012#011#011#011This generally indicates your disk performance
> #012#011#011#011is insufficient to deal with the number of on-going
> #012#011#011#011recordings, or you have a disk failure.
> Jun  4 22:51:40 gently mythbackend[1425]: W TFWWrite
> ThreadedFileWriter.cpp:499 (DiskLoop)
> TFW(/media/Recordings/1010_20140604222900.mpg:62): write(58092) cnt 2308
> total 134209816 -- took a long time, 16819 ms
>
>
> Worik
>
>
>
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