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For update and write-intensive applications go with RAID-1 vs. RAID-5, granted you will consume more raw capacity, however you will still have plenty of capacity from the looks of it. So, assuming that performance will be OK, and that HP agrees to support your needs and provide remedies such as substituting faster disk drives if necessary, using FATA gives you the benefit of saving on power, cooling and enclosure rack space -- not to mention some additional capacity.
In general, the more you can spread data across multiple disk drive heads is good. However again, look at and assess your applications performance requirements and have the consensus of the supporting vendor before using the larger capacity, slower disk drives. Look beyond cost or savings of the FATA vs. FC disk drives, considering the performance and configuration to support your applications needs including the longer disk drive rebuild time for the larger capacity disk drives now and in the future.
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This was first published in June 2006