[mythtv-users] Multi-rec - thoughts about max no. of recordings

Michael T. Dean mtdean at thirdcontact.com
Mon Jan 21 18:23:30 UTC 2008

On 01/21/2008 01:15 PM, Paul Mason wrote:
> So, this weekend I rebuilt my Myth box with svn 15504 in order to get
> multi-rec.
> It's all working very nicely but I was wondering about the setting of "max
> no. of recordings" on the capture card. This is what turns a single real
> tuner into a number of "virtual tuners" I guess. It defaults to 2. My system
> has a single SATA2 disc (16Mb cache, 7200rpm IIRC) and my recordings
> partition is using xfs. I've got a single Nova-T 500 i.e. 2 physical tuners.
> So I've been thinking about whether I want to increase this value or not.
> I'm wondering what sort of throughput it's reasonable to expect on a disc -
> and I'm assuming the disc is the limiting factor here. I have in the past
> year recorded two programs, whilst watching a 3rd and transcoding a 4th as
> part of a mytharchive job - I've done this quite regularly. Once or twice
> there was even a fifth doing ad-scanning - which I hadn't realised was
> running. So we're talking 5 pretty disc intensive operations simultaneously.
> Having said that I've got the RT priority stuff enabled and I know that
> mytharchive at least re-nices its jobs to a lower priority.
> I guess the obvious answer is to run a few tests and see what happens. Has
> anyone done this? Any thoughts on the issue?

Just a thought.  Adding additional disks (spindles) and keeping separate 
filesystems (no MD--no RAID'ing or LVM'ing the drives together) and 
adding them as separate directories in one or more storage groups would 
definitely help.


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