Hello Patrick,

I tried it. But it was not successful.

With "hdparm -W 0" iotop shows 3,3-3,7 M/s write speed, with "hdparm -W 1" it 
is 9,7-10,3 M/s. And the error message about "ring buffer overflow" stays the 
same with "-W 0" and the recordings are still broken.

Interesting: I made a good recording yesterday directly onto the SD flash card. 
When I copy that recording to the USB SSD i can play it back with 700-1100 K/s 
(iotop) without issue. 

Any other idea? Could I configure the flash SD card as cache and automoatically 
copy the recording to the SSD after it is finished?


Am 08.08.2016 um 22:53 schrieb Patrick Boettcher:
> On Mon, 8 Aug 2016 22:51:13 +0200
> Patrick Boettcher <patrick.boettc...@posteo.de> wrote:
>> Hi,
>> On Mon, 8 Aug 2016 20:30:33 +0200
>> Matthias Bodenbinder <matth...@bodenbinder.de> wrote:
>>> Hello Christoph,
>>> based on your feedback I made another test. The USB HD performance
>>> seems to be ok (see my other reply). But anyways I made a test with
>>> recording directly to the Flash SD card. And that works pretty well.
>>> 15 min without issue. So it looks like it is indeed an issue with
>>> USB on the Raspberry PI 2. Any idea how to solve that?  
>> It _could_ be the write-cache-flush which saturates the bus and then
>> dramatically decreases I/O of the overall system.
>> Try
>>     hdparm -W 0 /dev/<partition>
> You could also try iotop, which should I/O activity of all processes,
> maybe there is something going on.
>     sudo apt install iotop
>     sudo iotop
> Thanks,

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