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Each chassis size is listed to help find the product of interest.

• The best practice erasure coding for the best performance/capacity/price ratio is set at the factory.  More chassis equals more IOPs and throughput. 
• Raw Capacity is listed to match with our P/N's, i.e OS4/45-SAS-2.9PB
• Usable PB as in "Petabytes" is listed for Mac users as this would be the calculation shown with "Get Info" on a Mac
• Usable PiB as in "Pebibytes" is listed for the product GUI, Windows, and Linux users as this will be the calculation shown in the product admin GUI, with Linux "du", or "properties" in Windows Explorer
• Each starting configuration contains 4 matching servers with erasure coding set up to have the tolerance to have 1 server fail

The calculation is based on a freshly formatted system.

45 BAY - Object Store

Erasure Code Strip Size (K+M) = 12

Erasure Code parity (M) = 3

Storage Efficiency = 75%

60 BAY - Object Store

Erasure Code Strip Size (K+M) = 16

Erasure Code parity (M) = 3

Storage Efficiency = 81%

90 BAY - Object Store

Erasure Code Strip Size (K+M) = 12

Erasure Code parity (M) = 3

Storage Efficiency = 75%