[mythtv-users] Central Storage

jedi jedi at mishnet.org
Fri Mar 6 18:07:28 UTC 2009


On Fri, Mar 06, 2009 at 08:19:14AM -0800, Robert McNamara wrote:
> >
> > *5 family members with diverse tastes
> > *15 upcoming free to air channels ( 5 of which are HD )
> > *presently have at times have 3 VCRs and 3 Mythboxes recording simultaneously and some Mythboxes recording multiple streams.
> >
> 
> Do you intend to record all 15 channels at once or something?  Even if
> that were true...
> 
> Maximum Channel bandwidth:  19 Mbit/s
> 
> 5 family members watching at once at maximum bandwidth:  90 Mbit
> 15 Channels at 19 Mbit: 281 Mbit
> 
> 371 Mbit Total, assuming everyone were watching at once and you were
> recording all your channels at once (which would require at *least*
> 7-8 tuner cards).
> 
> As steve mentioned, you will run into other I/O bandwidth long before
> you saturate a gigE network.

     When my multi-frontend/backend setup is going full bore, the 
"central storage server" seems to give out before the network does.
7 mythjobqueue jobs running with 4 recordings active seems to hammer
the box pretty well. It's enough to leave the master backend with 
little (cpu/io) capacity left to service end users.

     If you've got an extreme setup then perhaps you want to DEcentralize
and keep activities as close to one particular box as possible. Perhaps
have storage on each backend and do any processing there rather than 
pushing stuff accross the network.


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