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? Matthias Am 08.08.2016 um 22:53 schrieb Patrick Boettcher: > 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, > _______________________________________________ vdr mailing list vdr@xxxxxxxxxxx https://www.linuxtv.org/cgi-bin/mailman/listinfo/vdr
