On Sat, 18 Feb 2012 18:04:07 +0100
Alex Schuster <wo...@wonkology.org> wrote:

...
> 
> Then I tried another video, again with the settings you
> suggested, and it stuttered. There were small pauses when
> the system did some stuff, and when I did my dd test, the
> pauses were as long as five seconds. FIVE SECONDS!
> 
>       Wonko
> 

Just an idea: Is the disk OK? Replace /dev/sda with your
disk...

smartctl -t short /dev/sda

and after some minutes

smartctl --all /dev/sda

If all went OK then the status is «PASSED», and you could
try the extended or long tests with smartctl.
I had a bad disk here, which resulted in slow IO, but not
complete failure. Smart detected this immediately. Sorry,
I do not know how to check disks with LVM.

Urs

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