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September 03, 2008


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Val Bercovici

Hi Mark,

Congrats on the impressive performance results!

Help me understand something here though. The SPC-1 disclosure report states you used "mirroring" as the data protection mechanism.

That implies RAID 1 or 10.

If so, how can you possibly claim more than 50% utilization?

Also, if your new RAID5 is so fast, why didn't you benchmark that?

marc farley

Thanks Val, Yes we used mirroring. The utilization is based on used capacity as a percentage of the volume's exported capacity. The ratio of used capacity to raw available capacity is 44%.

I'm not sure why we used mirroring instead of RAID 5 but I assume its because mirroring gives better results - and this is a benchmark after all. Of course, if we had used RAID 5, the ratio of used to raw would have been significantly higher.

FWIW, I'm going to be out for a few days. If you have more comments I won't be able to get to them until mid next week.

Val Bercovici

Thanks for the refreshing "un-Hollis-ian" candor Marc, that clarification makes sense :)

Enjoy your "outing". Looking forward to more of your vlogs!

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