[mythtvnz] Recording dropouts and disk performance...

[Rob Connolly]

On Sat, Feb 16, 2013 at 08:36:45PM +1300, Robin Gilks wrote:
> Hi Rob
> 
> You don't say what filesystem you are running or how much free space you
> have available. Also, what space have you asked MythTV to keep available
> as a 'float' so it can record without immediately deleting stuff. Also, do
> you have slow deletes enabled (only useful on some filesystems).
> 

Oops, sorry - the filesystem is ext4. Not sure about the float or slow
deletes settings, but I don't remember changing them from the defaults.

As far as space goes:

/dev/mapper/laforge-recordings  493G  318G  150G  68% /mnt/recordings

> I do find it odd that a Raid 1 system is so slow - my Raid 5 system, which
> in theory is 1/4 the speed (at best!) handles 8 simultaneous recording OK
> with a mixture of DVB-T, DVB-S and analog off a set=top box.
> 
> Might be worth playing this tune:
> http://systembash.com/content/simple-disk-benchmarking-in-linux-using-dd/
> just to actually measure a single file write. Shouldn't be too difficult
> to run the same in 2 terminals to test the 2 files scenario.
> 

Thanks, I'll give that a try at some point.

Cheers,

Rob