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How much useable capacity is available in a MatrixStore cluster with 40TB of raw capacity?
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Inappropriate?At the moment the MatrixStore software always protects any data written to it in two separate locations within the cluster to ensure the data is available for re-use, forever. So useable capacity is half that of the raw capacity available.
When MatrixStore is run on RAIDed disk then the overhead of RAID5 must also be taken into account:
42TB raw disk capacity (4 Apple Xserve RAID fully stacked = 10.5TB each)
after RAID becomes:
(42TB / 7) * 6 = 36
after dual location protection becomes:
36 / 2 = 18TB
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