[mythtv-users] Highest number of simultaneous streams recorded?

[Alex Brekken]

Steve, is there any way to add an LVM on an up-and-running system, or must
it be done during the OS install when partitioning the disk? (sorry, I don't
mean to hijack this thread but I figured this would be a quick answer)
Thanks!

On 10/14/05, Steve Adeff <adeffs at gmail.com> wrote:
>
> On Friday 14 October 2005 10:16, Brandon Beattie wrote:
> >
> > The current limitations on number of streams has to do with what
> > hardware you choose to use. This includes tuner cards, hard drives,
> > network cards, and CPU. I think it would still be rather easy to get
> > 10+ streams recording and 4-5 being played back (1 local, 3-4 remote)
> > before you see any problems. To do this you would need either hardware
> > assisted analog encoders, or an HD tuner because they won't use more
> than
> > 3% or so CPU. To reach a 10Rec 5Play number, you would want a good
> > processor and memory, something 3.4Ghz or over would be fine -- If
> > you're not going to watch video locally though, I bet you could do all
> > this with 2Ghz or less. Disk usage is the next issue. Using raid
> > 0, 5 or 10 would help in this areas you may be able to do 15 streams
> > total with 2-3 striped drives I would bet. Networking will be the final
> > issue. HD streams run up to just under 20Mb/s. As much as we wish to
> > get 1Gb/s speeds all the time, expecting much over 400Mb/s constant is
> > not always possible. Myth struggles to play video smoothly unless it
> > feels like it has room to breath and almost no packet loss.
>
>
> another option if you find yourself recording this much is to use LVM
> (logical
> volume manager). It would allow you to connect, say four 300gig drives and
> use them all as one AND stripe data across them (like RAID 0). Or you
> could
> use 3 striped and the 4th as a parity drive in case one dies.
> This would most definitely give you the drive speed required to not only
> record 4+ streams at once, but play back equally as many.
>
>
> Steve
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