[mythtv-users] Mythbackend causing high load

[Mike Benoit]

It appears the cause is due to fragmentation in the file system. Once
reiserfs is severely fragmented it starts to take huge amounts of CPU to
search for free blocks. 

Do you record two programs at once often? Apparently this is what causes
the most fragmentation. So depending on how badly your file system is
fragmented will depend on how much free space you're going to have to
keep available at all times. With a ~500gb drive, I would recommend you
keep between 50-60gb free at all times. 

I finally got in touch with the reiserfs guys and it looks like this may
be a bug, so hopefully we can help them track it down and get it fixed. 

On Sat, 2006-07-01 at 21:06 -0400, Jeff wrote:
> On 6/28/06, Mike Benoit <ipso at snappymail.ca> wrote:
> > How much free space do you have available on your ReiserFS partition?
> >
> > I discovered I need about 10% (30gb) free space on my 300gb drive to
> > keep the problem from happening, recordings have been flawless since I
> > discovered this.
> >
> 
> I'll free up some space and see if I can make the problem stop. It had
> gone away for a while but maybe that was because I cleaned a bunch of
> stuff up. Currently mythbackend status reports:
>     * Total Space: 472,752 MB
>     * Space Used: 439,528 MB
>     * Space Free: 33,224 MB
> and every recording sends mythbackend to 99% cpu time and the
> recordings are useless.
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-- 
Mike Benoit <ipso at snappymail.ca>
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