[CentOS] Re: RAID5 or RAID50 for database?

[Christopher Chan]

Nikolay Ulyanitsky wrote:
>> I can not comment on "most vendors" but for the PROGRESS RDBMS RAID5
>> is definitely not recommended. It will work but you will see a
>> significant reduction in performance. We strongly recommend that our
>> clients go with RAID10 (as in RAID 1+0). In-house we only use RAID10.
> 
> +1
> Write performance of RAID5 on hardware MegaRAID SATA 150-6D is *very*
> poor.
> 
> 

So? That thing is 1) ancient with what looks like a half-baked chip 
solution for raid5 calculations and 2) just comes with only 64MB of cache.

You can get a 3ware card with much more cache (9550 and above) and blow 
away that LSI piece of rubbish.