Big Disk Performance Difference Between 13.04/14.10 and 14.04

[Paul Brown]

When I look at info about the raid volume it says "Sector Size: 512". That
means I'm not affected by 4k sector problems?

I learned a bit more about the machines. They're not exactly the same. The
two poorly performing machines have different raid controller chipset
revisions and motherboard chipset revisions. And they still perform poorly
even when they're on 13.04 (same version as the good machine).

Oddly enough, the two poorly performing machines have great read speed when
they're on Ubuntu 14.10, but the write speed is still not so good.

On Thu, Jan 8, 2015 at 9:33 PM, blind Pete <0123peter at gmail.com> wrote:

> Paul Brown wrote:
>
> > I have three of the exact same dell r620 server (with a PERC H710 Mini
> > raid controller) and I'm seeing disk performance differences across
> Ubuntu
> > 13.04, 14.04, and 14.10.
> >
> > Read speed is 100% *better *on 13.04 and 14.10 - compared to 14.04.
> > Write speed is 50% *worse *on both 14.10 and 14.04 - compared to 13.04
> >
> > More detail about the benchmarks is here:
> >
> http://www.paulsprogrammingnotes.com/2015/01/slow-disk-performance-on-ubuntu-1304-vs.html
> >
> > Does anyone know what is likely to cause this issue?
>
> Wild stab in the dark:
>
> 4k sector (mis) alignment?
>
> --
> blind Pete
> Sig goes here...
>
>
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