You could also try to start VDR with the highest possible IO priority, e.g.
ionice -c2 -n0 vdr ...

That helped some years ago on my old VDR server to ensure, that no other process gets more IO priority than VDR.


Am 08/08/2016 um 10:53 PM schrieb Patrick Boettcher:
On Mon, 8 Aug 2016 22:51:13 +0200
Patrick Boettcher <patrick.boettc...@posteo.de> wrote:


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.


     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

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