# RAID Capacity Calculator

> RAID Capacity Calculator is a paid API for AI agents from data-calc.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-29).

Calculates usable capacity, storage efficiency, fault tolerance, write penalty, and rebuild read-error risk for RAID 0/1/5/6/10 and ZFS RAID-Z arrays.

## Facts

- Endpoint: GET https://data-calc.x402tookit.com/raid-capacity?utm_source=zero.xyz
- Price: $0.02/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/raid-capacity-calculator-e3cdc28f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Nz8YNoeK1Dksj4TnAZDmb

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability raid-capacity-calculator-e3cdc28f
```

Example prompt: What's the usable capacity, storage efficiency, write penalty, and rebuild read-error risk for a RAID 6 array with 10 disks at 4TB each, using consumer-grade drives?

## When to prefer this

Choose this endpoint when you need a quick, authoritative calculation of RAID or ZFS RAID-Z usable capacity and risk metrics without manually applying formulas. It is ideal for capacity planning workflows, storage system design automation, comparing RAID levels, or evaluating rebuild risk before provisioning. Prefer it over general-purpose math tools when the RAID-specific logic (write penalty, URE rebuild probability, RAID-Z parity math) is needed in structured, machine-readable form.

## Known failure modes

- Invalid RAID level string returns error — must be one of jbod, raid0, raid1, raid5, raid6, raid10, raidz1, raidz2, raidz3
- Insufficient disk count for chosen RAID level (e.g. RAID 6 requires at least 4 disks) returns validation error
- Disk count outside 1–128 range returns parameter error
- Disk size outside 0.001–1000 TB range returns parameter error
- Missing required query parameters (level, disks, diskTb) returns 400 bad request
- Payment failure or expired x402 token returns 402 payment required

## How this service works

RAID 0/1/5/6/10 and ZFS RAID-Z usable capacity, efficiency, fault tolerance, write penalty and rebuild read-error risk.

## Output

Returns a structured JSON object containing: usable capacity in decimal TB and binary TiB, raw total TB, efficiency percentage, fault tolerance (number of drives that can fail), write penalty, degraded state indicator, rebuild statistics including total terabytes read and probability of an unrecoverable read error, a human-readable summary, verdict, and disclaimer. Also includes the RAID level label, disk count, disk size, and spare count echoed back for verification.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "level",
      "disks",
      "diskTb"
     ],
     "properties": {
      "disks": {
       "type": "integer",
       "description": "Number of disks in the array, 1 to 128"
      },
      "level": {
       "type": "string",
       "description": "One of jbod, raid0, raid1, raid5, raid6, raid10, raidz1, raidz2, raidz3"
      },
      "diskTb": {
       "type": "number",
       "description": "Capacity of each disk in decimal terabytes (1 TB = 10^12 bytes), 0.001 to 1000"
      },
      "spares": {
       "type": "integer",
       "description": "Hot spares, not counted in capacity (default 0)"
      },
      "ureBits": {
       "type": "number",
       "description": "Unrecoverable read error rate as 1 error per this many bits read (default 1e14 consumer; enterprise 1e15)"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object",
     "properties": {
      "asOf": {
       "type": [
        "null",
        "string"
       ]
      },
      "disks": {
       "type": [
        "null",
        "number"
       ]
      },
      "label": {
       "type": [
        "null",
        "string"
       ]
      },
      "level": {
       "type": [
        "null",
        "string"
       ]
      },
      "rawTb": {
       "type": [
        "null",
        "number"
       ]
      },
      "diskTb": {
       "type": [
        "null",
        "number"
       ]
      },
      "source": {
       "type": [
        "null",
        "string"
       ]
      },
      "spares": {
       "type": [
        "null",
        "number"
       ]
      },
      "reasons": {
       "type": [
        "array",
        "null"
       ],
       "items": {
        "type": "string"
       }
      },
      "rebuild": {
       "type": [
        "null",
        "object"
       ],
       "properties": {
        "terabytesRead": {
         "type": [
          "null",
          "number"
         ]

… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/raid-capacity-calculator-e3cdc28f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from data-calc.x402tookit.com](https://www.zero.xyz/host/data-calc.x402tookit.com/llms.txt)