Messages in this thread | | | Date | Wed, 18 Jan 2006 13:09:51 +0800 | From | Max Waterman <> | Subject | Re: io performance... |
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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. >> - >> To unsubscribe from this list: send the line "unsubscribe >> linux-kernel" in >> the body of a message to majordomo@vger.kernel.org >> More majordomo info at http://vger.kernel.org/majordomo-info.html >> Please read the FAQ at http://www.tux.org/lkml/ >> >
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