Re: Excessive IO wait with megaraid card

On Nov 29, 2006, at 08:02 , Paul Krizak wrote:

> We've also had significant problems with the Megaraid card on our  
> Celestica Quartet quad opterons.  Most notably, RAID-5 is total  
> crap on it.  Trying to run a database (MySQL in our case) on a  
> Megaraid RAID-5 backend was too slow to even be useable.  We ended  
> up in a RAID 1+0 configuration that performed quite well.

No experience with Megaraid but not necessarily and issue with the  
card.  RAID-5 is just fundamentally poor for some database workloads.

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