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Larry Bolhuis wrote on Fri, 07 Oct 2005 16:09:34 GMT: > Two drives > just simply isn't enough for all but the simplest tasks. We > have sold the two mirrored drive configuration to a couple > small customers. They were previously running on itty bitty > AS/400s so even though to me they are slow the customers are > very happy with performance. We upgraded one customer from > two drives mirrored to 4 drives mirrored and it was a > day/night difference in performance. (100% more I/O > bandwidth!) I suspect that had you added the RAID card, you would've also seen a huge improvement even for a mirrored configuration. Remember that when RAID protection is used, the RAID IOA adds write cache to the configuration. In the base config with mirroring there is NO write cache so all writes are at disk speed versus at cache speed .... that usually represents a huge difference in performance for any workload that has more than about 10% writes.
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