Re: io performance...

[Max Waterman <davidmaxwaterman+kernel@fastmail.co.uk>]

Jeff V. Merkey wrote:
> Max Waterman wrote:
>
> > One further question. I get these messages 'in' dmesg :
> >
> > sda: asking for cache data failed
> > sda: assuming drive cache: write through
> >
> > How can I force it to be 'write back'?
>
>
>
> Forcing write back is a very bad idea unless you have a battery backed 
> up RAID controller.  

We do.

In any case, I wonder what the consequences of assuming 'write through' 
when the array is configured as 'write back'? Is it just different 
settings for different caches?

Max.

> Jeff
>
> > Max.
> > -
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