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Posted by Robert Klemme on 05/08/06 22:45
Per Schjetne wrote:
> If you are using Dell hardware with Perc controllers - Read this:
>
> http://forums.2cpu.com/showpost.php?p=252226&postcount=11
>
> I will be testing this during the next day to see if this explains my
> overall bad diskperformance.
I may be missing something but is "write back" not slower than "write
through" anyway? I mean with write through the data has to be written
twice with RAID 10 before the IO call returns; I'm not sure whether this
can happen in parallel - if not you're at twice the time. But with
write back the controller can put the data into its internal cache (as
long as there is space left), IO call can return and then it can writing
stuff in the background.
Regards
robert
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