[mythtv-users] how many concurrent recordings possible? in HD?
John P Poet
jppoet at gmail.com
Fri Dec 9 18:26:09 EST 2005
On 12/9/05, mrwester <mrwester at gmail.com> wrote:
> My mythtv system has 1xPVR-350, 1xPVR-500 using ivtv 0.4, and a newly added
> DViCO FusionHDTV 5 Lite using DVB drivers. 1x200GB seagate+1x300GB seagate
> HD LVM with XFS for /video and 1x40GB seagate for FC4 OS. I have DMA
> enabled. DVI out via fx5200 at 1280x768. Chaintech nforce2 mobo, AMD2900
> with 1gb ram. All 4 tuners can capture on their own with no problems. I
> can capture with all 3 Hauppauge tuners at the same time no problems.
> Trying to capture HDTV while capturing with the Hauppuge cards results in
> normal analog recordings but the digital recording has dropouts and
> scrambled bars across it. I need to double check if capturing digital NTSC
> with the DViCO card also has the dropouts when one or more PVR cards are in
> I'm new to the HDTV part of mythtv and looking for feedback to tell me if
> what I'm trying to do is realistic or not. And if it is realistic, where
> should I look to troubleshoot. Thanks for any insight.
I have four HD-3000 cards writing to a 5 disk software RAID5 formatted
as XFS. I can record on all four cards simultaneously without any
problem. I do *not* use LVM -- which I believe adds some overhead.
Software raid5 on a 3GHz Pentium 4 system results in very good disk
As a test, I tried turning OFF hyperthreading on my 3.0GHz P4, and
started having problems recording more than two HD programs at a time.
Don't know how Athlons perform, but HT is a win for Pentiums.
Another datapoint - My raid5 had to rebuild one of the disks. During
this rebuild, I could still record one HD stream without a problem,
but two resulted in a LOT of corruption, and a lot of messages about
it taking a LONG time to get data from the HD tuner card.
I noticed that Daniel add a ringbuffer into myth's DVB processing
today, so that should help any system which is marginal.
Don't know if any of this helps you, but thought it might...
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