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THE FEUTEX TOOLKIT

Parity RAID Capacity Budget

Estimate usable capacity and full-stripe payload from disk and parity counts.

Computer Systems workspace● Runs in your browser
01 Your input
02 Your result
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Formulacapacity=(N−parity)diskBytes
Sources and model references

Worked example

Inputs

Equal-size member disks
6
Parity members per stripe
2
Usable bytes per disk
1000000000000 bytes
Per-disk chunk
65536 bytes

Expected results

Array data capacity
4e+12 bytes
Full-stripe data payload
262144 bytes
Raw-capacity utilization
0.6666666667 fraction

Load the example in the workspace to reproduce these results. Display rounding does not change the underlying calculation.

How to use this tool

  1. Enter the labeled inputs in the indicated units.
  2. Calculate and compare every output against the stated model assumptions.

Try this example

{
  "disks": 6,
  "parity": 2,
  "bytes": 1000000000000,
  "chunk": 65536
}

Accuracy and scope

Equal-size conventional RAID5/6-style stripes; metadata, spare disks and filesystem space excluded. Simplified analytical model; not a design recommendation or safety certification.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.