[mythtv-users] Is there a tuner limit? (problem with >8 tuners)

Chris Wilkie - NetrinoUK chris at netrino.co.uk
Tue Aug 21 18:03:19 UTC 2007


I am indeed using the onboard SmartArray with 32MB onboard RAM.  It has
a pair of U320 36GB disks in RAID5 I believe (I'll double check this if
this makes any difference to your answer).  I don't need much storage,
as the media will simply get dumped there for 10-15 mins after the show
has ended whilst ffmpeg does it's thing.  The source media will then get

I'm currently running a test with the storage mounted via NFS onto a
basic 2-SATA Linux box with software RAID.  It's only a baby - 2.8GHz
Celeron w/1GB RAM - but Myth seems a lot happy with multiple recordings.
Certainly load average is lot less, and 'wa' is 0%.


> -----Original Message-----
> From: mythtv-users-bounces at mythtv.org 
> [mailto:mythtv-users-bounces at mythtv.org] On Behalf Of Brian Long
> Sent: 21 August 2007 18:16
> To: Discussion about mythtv
> Subject: Re: [mythtv-users] Is there a tuner limit? (problem 
> with >8 tuners)
> On 8/21/07, Chris Wilkie - NetrinoUK <chris at netrino.co.uk> wrote:
> >
> > Now the problem I'm having is write speed on the disk array.  When 
> > making 8+ recordings, the load average (and io wait) shoots up.  It 
> > would appear that Linux is seeing the server's RAID system and 
> > switching the software write cache off, except that this server 
> > (apparently) doesn't have a write cache.  I guess 
> performing 8+ random 
> > writes to disk at 5-7MBit/sec each is causing the problem.  
> If anyone 
> > knows how to force the software write cache back on (to 
> save me some 
> > google time finding out) please let me know! :)
> Chris,
> I'm familiar with the HP DL740.  I assume your only disk 
> subsystem is the integrated SmartArray controller.  How many 
> disks are you using and how are they configured?
> /Brian/
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