[oclug] Setting up MythTV
lists at L8R.net
Tue Mar 29 17:05:57 EST 2005
On Tue, 29 Mar 2005 16:56:28 -0500
Roger Messier <en916 at ncf.ca> wrote:
> To anyone that has a MythTV box, is it OK if MythTV is on a server box
> with other stuff running (e.g. Apache, MySql, NFS, etc) if the hardware
> is fast enough, or should it be on its own box no matter what the
This is a difficult question to answer.
I/O may be your biggest problem here. Even with some of the, erm,
"better" I/O elevators in 2.6 (and, 2.6 on a server?! No thanks!). Myth
might skip on playback a bit, if you have a lot of disk contention.
Providing a dedicated ide hard drive, on a dedicated channel, would
probably be sufficient, even under I/O load. With a PVR250, you won't be
using any noticeable CPU in terms of capturing, and a pause in I/O won't
hurt the capture process (with enough ram to buffer), so my statements
above primarily refer I/O for playback.
> I don't actually have the server box yet (it's a server that's being
> decommissioned at work), so I can't give you the exact specs, but it's a
> dual proc system (at least P3, maybe Xeon, not sure of the speed), at
> least 1 GB of RAM, two SCSI disks (not sure of the size). Given these
> (very) approximate specs, do you think that it'll be enough if I use a
> tuner card with hardware encoding like the PVR-250?
Dedicate one of those SCSI disks to I/O, and you'll be quite fine. Are
you going to use the same box for playback of video, btw? If so, you
*may* want to make MythTV realtime, but I shudder to think it.
After all, a race in Myth would take that whole box down. Not
preferable for a server. However, playback is a very time dependant
thing. Writing fields to video cards, or performing de-interlace
operations, as well as getting them to be displayed at just the right
time, does require constant CPU availability.
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