[mythtv-users] High disk activity

[Chris Pinkham]

* On Sun Dec 09, 2007 at 11:34:02PM +0100, Wolfgang Grunewald wrote:
>   http://tinyurl.com/22xppv

There's some woman blocking the view in this graph.

> When I record the stream "manually" using

>   http://tinyurl.com/26x2oj

Besides the fact that LiveTV is reading and writing, it could also
be attributed to the fact that Myth calls sync() to force flushing
to disk while your manual 'cat' just lets the OS decide when to flush
to disk.
 
> (Looks like the HD cache is not being used at all.)

Sounds like this may be what you're seeing them.

> What can I do to reduce the high disk activity?

It's not really high, just more visible on the graphs.  It's
writing the same amount of data out to disk, Myth just spreads it out
more while your 'cat' is being dumped to disk in larger chunks by the
OS.

--
Chris