[mythtv-users] Are there any throttling features in Mythtv?

[Josh White]

On Tue, Feb 3, 2009 at 1:32 PM, Cymen Vig <cymenvig at gmail.com> wrote:

> On Tue, Feb 3, 2009 at 11:51 AM, Mike Perkins
> <mikep at randomtraveller.org.uk> wrote:
> > Kevin Kuphal wrote:
> > I have also been keeping my mysql database on a different drive. I have
> two
> > identical recording drives. I wanted to get to a situation of 1 drive (or
> > more) per tuner, but the finances won't allow that yet. Actually, if
> money
> > were no object, I'd have one mobo + drive per tuner, probably all in 1U
> rack
> > cases, but that's not going to happen this side of hell freezing over, so
> I
> > have to go with what I've got.
>
> You don't say what your gear is but there may also be the option of
> throwing better tuner/encoders at the problem. I'm down to only
> recording over the air which works out great as ATSC is fairly
> lightweight compared to the files I had coming out of my PVR-500 when
> on cable. In both cases, the compression would be MPEG-2 but there is
> a huge difference. Similarly, there are options now for encoding
> analog to H.264/MPEG-4 which should also lower the bitrate (assuming
> recording same content).
>
> But even a fairly lightweight backend with a low end Core Duo or
> equivalent AMD and inexpensive SATA drives should be able to handle
> quite a few streams (assuming combined frontend/backend). It might be
> the configuration of your hardware. Say you're recording four streams
> and the resulting files are 8 GB/hr:
>
>  8 GB x 4 = 32 GB / 60 = .533 GB / minute =~ 550 MB / minute = 9.2 MB /
> second
>
> There will of course be more over head but assuming you're writing 4
> streams and reading 1 most typical SATA drives should be able to
> handle it without breaking a sweat. Now if you add in other processes
> that are reading/writing large amounts of data (ie commflagging, etc)
> then...
>
> Cymen
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>


FWIW,

I can handle 5x recordings (2x PVR-500 & 1 PVR-250, analog cable) & 5x
playbacks (of 5 different recordings) all on a old Dell Dimension.  It's a
2.8ghz, 400mhz FSB P4, 1.0GB RDRAM, has all ATA-100 drives (my recordings
are on an LVM made of a 120gb and a 60gb drive, my OS & databse are on a
40GB drive) all connected via 100mbit netowrk (which is a $40 netgear
wireless router & $20 linksys switch).  It's a bit slow to start playback on
the last few frontends that start, but it eventally plays.  There may be a
stutter or two on occasion, but it's certianly watchable.  Granted, this
never happens to my machine in practice, but it worked well enough for my
stress test.  I kept this going for about an hour (my recordings all started
at about the same time, but it took some time to start the playback on the
various frontends strewn about my house).

I'm not sure if that means anything in your case, but it is an example of
what myth can do with my hardware.

Good luck,

 Josh
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