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To calculate the usable space simply multiply the number of data disks by the capacity of a single HDD, e.g. for a 4 x (5 + 1) setup (4x5r1), one has 4*5=20 data disks and thus 240TByte usable capacity - assuming 12TByte disks. In reality, due to differences of calculating/displaying values, base1000 versus base1024 the real net capacity may be different by a few percent.
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# Benchmarks
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The usual candidates for testing:
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* [fio](https://github.com/axboe/fio)
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* [iozone](http://iozone.org/)
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* [bonnie++](https://www.coker.com.au/bonnie++/)
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