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Sue,At the low end usually we are doing mirroring to avoid the cost of the RAID card. Certainly the memory on it will help performance of those drives but then we generally end up going back to RAID for more capacity. On those low end boxes we are still struggling to save every dime. On the high end machines we either don't put drives in the CEC at all or include the RAID card no matter what protection is selected.
- Larry Sue Baker wrote:
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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