On Mon, 8 Aug 2016 22:51:13 +0200
Patrick Boettcher <patrick.boettcher@xxxxxxxxx> wrote:
> Hi,
>
> On Mon, 8 Aug 2016 20:30:33 +0200
> Matthias Bodenbinder <matthias@xxxxxxxxxxxxxx> 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,
--
Patrick.
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