How Is the Available Capacity of the OceanStor 9000 Calculated?

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Available capacity = Raw capacity x Storage utilization (corresponding to the redundancy ratio) x 0.9 (excluding space consumed by metadata and system data as well as the reserved space)

For example: If an OceanStor 9000 has six nodes configured with 2 TB disks and N+2 redundancy ratio, its available capacity is: 6 x 35 x 2 x 4/(4 + 2) x 0.9 = 252 TB.

The capacity units provided by disk manufacturers are conversed based on 1000, instead of 1024. In this manner, the actual capacity of a disk marked with 1 TB capacity is 1000/1.024 = 976 GB.

In video surveillance scenarios, the available capacity is calculated based on the bit rate of cameras – 1024. In such cases, you must exclude the capacity loss caused by the number system conversion to get the accurate available capacity.

In other scenarios, if a customer has requirements on available capacity, communicate with the customer to determine whether to use 1000 or 1024 for unit conversion.

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