Hi,

Sorry for interrupting with stupid questions.. Would'nt a NAS do a better job in this case?


René


On 11.08.2016 11:57, Matthias Bodenbinder wrote:
I tried it, but it did not help. ionice -c2 or ionice -c2. No
difference.

Anyways, I now have a record hook in place which moves finished
recordings from SD card to USB drive. SD is now acting like a cache.
That works so far.

Thanks Matthias

Am 10.08.2016 um 21:15 schrieb Stephan Loescher:
Hi!

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.

Regards, Stephan.


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:

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


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