A professional storage capacity planning tool for various RAID configurations, including standard RAID, Synology SHR, ZFS, and Unraid. Built by Beyond Cloud Technology..

🌟 Features

Wide RAID Support - Calculates usable storage for:
- Standard RAID: 0, 1, 5, 6, 10
- Synology: SHR & SHR-2
- ZFS: Stripe, Mirror, RAIDZ1, RAIDZ2, RAIDZ3
- Unraid: 1 or 2 parity drives
Accurate Calculations - Accounts for the difference between decimal (TB) and binary (TiB) units, showing you the actual usable capacity (e.g., 12TB drives = 10.91 TiB actual)
Mixed Drive Sizes - Supports configurations with drives of different sizes, especially useful for SHR, ZFS, and Unraid
ZFS vdev Support - Configure multiple vdevs within ZFS pools for advanced configurations
Clear Results - Displays:
- Usable capacity (in both TiB and TB)
- Raw capacity
- Storage efficiency percentage
- Fault tolerance (how many drives can fail)
- Read/write performance insights
Intuitive Interface - Easy-to-use sliders and dropdowns with real-time validation

📖 How to Use

1. Open the Calculator

Simply open the index.html file in any modern web browser. No installation or server required!

2. Select Your RAID Type

Choose your desired RAID configuration from the dropdown menu. Options are organized by category:

Standard RAID - Traditional RAID levels (0, 1, 5, 6, 10)
Synology RAID - SHR and SHR-2 for Synology NAS devices
ZFS RAID - ZFS configurations including RAIDZ variants
Unraid - Unraid parity configurations

3. Configure Your Drives

Option A: Uniform Drive Sizes

For arrays with identical drives:

Use the Number of Drives slider to set how many drives you have (2-24)
Select the Drive Size (TB) from the dropdown (1TB to 24TB)

Option B: Mixed Drive Sizes

For arrays with different sized drives (perfect for SHR, Unraid, or ZFS):

Toggle the Mixed Drive Sizes switch to enable custom configuration
Individual drive size selectors will appear for each drive
Set the size for each drive independently

Option C: ZFS with Multiple vdevs

For advanced ZFS configurations:

Select a ZFS RAID type (Mirror, RAIDZ1, RAIDZ2, or RAIDZ3)
Configure the Number of vdevs slider
Set Drives per vdev to determine how many drives in each vdev
The total drive count is calculated automatically

4. Calculate Storage

Click the Calculate Storage button to perform the calculation.

5. Review Results

The results panel will display comprehensive information about your configuration:

Results include:

Usable Capacity - The actual storage available for your data (shown in both TiB and TB)
Raw Capacity - Total capacity of all drives combined
Storage Efficiency - Percentage of raw capacity that's usable
Fault Tolerance - How many drives can fail simultaneously without data loss
Performance Insights - Read and write performance characteristics
Drive Configuration - Summary of your drive setup

💡 Understanding the Results

Capacity Units

The calculator shows capacity in both formats:

TiB (Tebibytes) - Binary units (1024-based), what your OS reports
TB (Terabytes) - Decimal units (1000-based), how drives are marketed

Example: A 12TB drive shows as approximately 10.91 TiB in your operating system.

Storage Efficiency

This shows what percentage of your total drive capacity is actually usable:

RAID 0 - 100% (no redundancy)
RAID 1 - 50% (full mirroring)
RAID 5 - Varies based on drive count: (n-1)/n
RAID 6 - Varies based on drive count: (n-2)/n
SHR/Unraid - Optimized based on drive sizes

Fault Tolerance

Indicates how many drives can fail before data loss:

0 drives - No redundancy (RAID 0, ZFS Stripe)
1 drive - Single parity (RAID 5, RAIDZ1, SHR, Unraid-1)
2 drives - Double parity (RAID 6, RAIDZ2, SHR-2, Unraid-2)
3 drives - Triple parity (RAIDZ3)

🔧 Technical Details

Technology Stack

Frontend: HTML5, CSS3, JavaScript (ES6+)
Fonts: Inter (Google Fonts)
No Dependencies: Pure vanilla JavaScript, no frameworks required
Client-Side: All calculations performed in the browser

Calculation Methodology

The calculator uses industry-standard formulas for each RAID type:

Standard RAID - Traditional RAID calculations accounting for parity and mirroring
Synology SHR - Simulates Synology's hybrid RAID algorithm for optimal space utilization
ZFS - Accounts for vdev striping and RAIDZ parity overhead
Unraid - Calculates based on largest drive(s) being used for parity

All calculations account for the binary/decimal conversion (TB to TiB).

🌐 Browser Support

Works on all modern browsers:

✅ Chrome/Edge (Chromium-based)
✅ Firefox
✅ Safari
✅ Opera

📱 Responsive Design

The calculator is fully responsive and works on:

Desktop computers
Tablets
Mobile phones

🎯 Use Cases

Perfect for:

Home Lab Enthusiasts - Planning NAS storage upgrades
IT Professionals - Calculating storage requirements for clients
Data Hoarders - Optimizing storage efficiency
System Administrators - Comparing different RAID configurations
Students - Learning about RAID technology and storage efficiency

🚀 Getting Started

Download or clone this repository
Open index.html in your web browser
Start calculating!

No build process, no dependencies, no installation required.

📄 License

This project is licensed under the GNU General Public License v3.0 - see the LICENSE file for details.

🎥 Learn More

Visit our YouTube channel @beyondcloudtechnology for tutorials, guides, and tech content.

👨‍💻 About Beyond Cloud Technology

Professional technology solutions and educational content for IT professionals and enthusiasts.