On Aug 13, 2008, at 2:54 PM, Henrik wrote:
Additionally, you need to be careful of what size writes you're using. If you're doing random writes that perfectly align with the raid stripe size, you'll see virtually no RAID5 overhead, and you'll get the performance of N-1 drives, as opposed to RAID10 giving you N/2.But it still needs to do 2 reads and 2 writes for every write, correct?
If you are completely over-writing an entire stripe, there's no reason to read the existing data; you would just calculate the parity information from the new data. Any good controller should take that approach.
-- Decibel!, aka Jim C. Nasby, Database Architect decibel@xxxxxxxxxxx Give your computer some brain candy! www.distributed.net Team #1828
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