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DateWed, 18 Jan 2006 13:09:51 +0800
FromMax Waterman <>
SubjectRe: io performance...
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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