Re: Raid 5 vs Raid 10 Benchmarks Using bonnie++

On 18/08/2011 11:48 AM, Ogden wrote:
> Isn't this very dangerous? I have the Dell PERC H700 card - I see that it has 512Mb Cache. Is this the same thing and
goodenough to switch to nobarrier? Just worried if a sudden power shut down, then data can be lost on this option. 
>
>
Yeah, I'm confused by that too. Shouldn't a write barrier flush data to
persistent storage - in this case, the RAID card's battery backed cache?
Why would it force a RAID controller cache flush to disk, too?

--
Craig Ringer