[mythtv-users] Anyone running a diskless frontend?
usenet at wingert.org
usenet at wingert.org
Thu Feb 13 13:09:57 EST 2003
Unfortunately, this is a real expensive way to go. I've looked at this
already. Reader + Card > Low GB Harddrive
One option is to boot off the HD and then turn it off.
Another is to boot off a CDROM. You would need either two CDROMs or have to
swap out the boot CDROM to play a DVD.
I think turning off the HD is the way to go.
>
> Also, has anyone looked at using a very small distro and booting off a
> CF card. It's pretty easy to attach a CF card to an IDE slot and have
> the computer think it is a disk. http://www.pcengines.ch/cflash.htm You
> can get a 128M cf card for less then $40
> http://store.yahoo.com/digi4me/12commemcart.html.
>
> I want to do this, but I have a long way to go before I can get all this
> figured out.
>
> Ben
>
>
> -----Original Message-----
> From: mythtv-users-bounces at snowman.net
> [mailto:mythtv-users-bounces at snowman.net] On Behalf Of
> usenet at wingert.org
> Sent: Thursday, February 13, 2003 3:14 PM
> To: mythtv-users at snowman.net
> Subject: Re: [mythtv-users] Anyone running a diskless frontend?
>
>
> One more thing.
>
> There are X procotol compressors available (in ssh for example).
> However, these usually do gzip/bzip type compression as opposed to the
> DCT type compression (yielding worse results).
>
>
> >
> > Personally, I would not run X over ethernet. I would export the root
> > of a filesystem and run X locally on the diskless machine (much less
> > bandwith given the raw bulk of video). Although I export mythtv
> > sessions all the time from one of PVRs for testing purposes,
> > performance is fine.
> >
> > If you are exporting the streams as opposed to X, the following should
> > yield your performance.
> >
> > I haven't had much experience with the codec that MythTV uses (I am
> > using TiVos for recording devices). If I remember correctly 1 hour is
> around 2 GBs.
> > This is about 582 kB/s.
> >
> > A good 100BT connection can sustain about 90 Mb/s (11 MB/s), in an
> > optimal
> > environment.
> >
> > Given this performance 100BT should be able to sustain approximately
> > 19 streams. This does not include the disk bottleneck though.
> >
> > Since X exports images in a more raw format, you essentially lose your
>
> > codec compression rate. So you could divide the number of streams by
> > your compression rate to achive the number of X streams.
> >
> > BTW - 100BT has a lot of bandwidth.
> >
> > HTH
> >
> > >
> > > Further to this discussion, I have been thinking about this.
> > > <Disclaimer>
> > > this is a question, not a suggestion. I haven't tried it and doubt
> it will
> > > be very efficient.</Disclaimer>
> > >
> > > How about running the backend *and* frontend somewhere in a storage
> > > room or
> > > whereever you can't hear it. Then next to your TV you have a
> Pentium 200 or
> > > some such just running X -query mythserver? Vanilla pentiums used
> to be
> > > quiter than a mouse. Double that with a nfs-root and you have a
> dead silent
> > > "frontend" that only has a network card and a TV-out PCI card. The
> video
> > > card of course must have xv support. You have to take care of
> audio. How
> > > about nas?
> > >
> > > Would the traffic choke a 100MB switch? Is this even feasable to
> > > attempt?
> > >
> > > Thanks,
> > > IvanK.
> > >
> > > On Thursday 13 February 2003 04:09 am, Bruce Markey wrote:
> > > > Aaron Stewart wrote:
> > > > > I dunno.. It seems like network transfer of data is adding
> > > > > another level of complexity that could be avoided, but if sound
> > > > > dampening is necessary, then it's a necessary evil :).
> > > > >
> > > > > My understanding was that an uncompressed mpeg2 stream ran at
> > > > > 18mbits/sec, which translates to:
> > > > >
> > > > > send->18mbit
> > > > > recv<-18mbit
> > > > > buffer->18mbit (for delayed playback)
> > >
> > > _______________________________________________
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> > >
> > >
> >
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