[mythtv-users] truncated recording

[Gary Greener]

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>________________________________
>
>

>________________________________
> From: George Mari <george_mythusers at mari1938.org>
>To: mythtv-users at mythtv.org 
>Sent: Monday, February 17, 2014 9:42 PM
>Subject: Re: [mythtv-users] truncated recording
>  
>
>
>On 2/17/14, 8:40 PM, Mark Wedel wrote:
>> On 02/17/14 03:30 AM, Mike Perkins wrote:
>>> On 17/02/14 02:45, Mark Wedel wrote:
>>>>
>>>>   A few nights ago, my recording of OTA olympic recording was 
>>>> truncated.  It
>>>> would end after about 15 
>REMOVE ME FROM YOUR MAIL LIST. MYTHTV.ORG HAS REPEATEDLY
>REFUSED TO REMOVE ME FROM THEIR LIST. USERS BEWARE !!!
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>>________________________________
>>minutes.
>>>>>
>>>>>   Since I started watching it while it was still on, mythtv was 
>>>>> claiming the
>>>>> space used was increasing, and after it finished recording, 
>>>>> statedthe recorded
>>>>> size was about 25 GB.
>>>>>
>>>>>   However, using the info to find out the file name, and then 
>>>>> finding the actual
>>>>> file in the filesystem, it was about 1 GB.  Mythtv itself did not 
>>>>> state any
>>>>> errors with the recording.
>>>>>
>>[deleted]
>>>  There are no errors in the log messages or anything else to indicate 
>>> a disk problem, though that isn't to say that might not be the cause.
>>>
>>>  But in that case, I would expect that mythtv would see an error 
>>> writing the data out, and thus not presume the file was recorded OK.  
>>> Mythtv clearly believed it was writing out data, yet the file itself 
>>> does not reflect that.
>>[deleted]
>>
>>I know you said you didn't find any errors in the log files, but this 
>>sounds exactly like the problem I've been trying to resolve on my system 
>>the last couple of weeks.  In my case it's not exactly a disk problem, 
>>but a disk system performance problem.  It's very clearly spelled out in 
>>the error messages stored in the logs - I usually get several of these 
>>messages:
>>
>>Feb  9 03:26:26 poseidon mythbackend[2644]: 2014-02-09 03:26:26.416829 W 
>>TFW(/video/recordings/2051_20140209060000.mpg:83): write(65424) cnt 63 
>>total 3851744 -- took a long time, 2936 ms
>>Feb  9 03:26:31 poseidon mythbackend[2644]: 2014-02-09 03:26:31.448490 W 
>>TFW(/video/recordings/2051_20140209060000.mpg:83): write(12408) cnt 45 
>>total 2815864 -- took a long time, 1484 ms
>>Feb  9 03:26:42 poseidon mythbackend[2644]: 2014-02-09 03:26:42.383568 W 
>>TFW(/video/recordings/2051_20140209060000.mpg:83): write(46248) cnt 80 
>>total 4935940 -- took a long time, 2503 ms
>>
>>...followed by this:
>>
>>Feb 11 23:06:36 poseidon mythbackend: 2014-02-11 23:06:36.478976 E 
>>TFW(/video/recordings/2021_20140212043500.mpg:75): Maximum buffer size 
>>exceeded.
>>Feb 11 23:06:36 poseidon mythbackend: file will be truncated, no further 
>>writing will be done.
>>Feb 11 23:06:36 poseidon mythbackend: This generally indicates your disk 
>>performance
>>Feb 11 23:06:36 poseidon mythbackend: is insufficient to deal with the 
>>number of on-going
>>Feb 11 23:06:36 poseidon mythbackend: recordings, or you have a disk 
>>failure.
>>
>>Sounds like the exact symptoms you're seeing - file is truncated, and 
>>shows much larger size on in the MythFrontend UI than what is actually 
>>on the disk.  I have 4 ATSC tuners recording to a single, 4-disk RAID5 
>>array, and have recently done some tuning of the array and disks to 
>>pretty much eliminate the problem when multiple tuners are recording.
>>
>>Is it possible your mythbackend messages are being logged somewhere 
>>other than where you are looking?
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>>    
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