# Ceph Max Storage Calculator

A modern web application for calculating the maximum allowed storage usage in a Ceph cluster.

## Features

- Calculation of maximum storage usage based on Ceph documentation
- Support for Replication and Erasure Coding
- Dynamic addition and removal of nodes and OSDs
- User-friendly interface with modern design
- Dark/Light Mode support
- Export/Import of configurations
- PDF report generation
- Responsive design for all devices
- Fault tolerance analysis for nodes and OSDs

## Installation

1. Clone repository:
   ```
   git clone <repository-url>
   cd ceph-calculator
   ```

2. Set up Python environment:
   ```
   python -m venv venv
   venv\Scripts\activate  # Windows
   source venv/bin/activate  # Linux/Mac
   ```

3. Install dependencies:
   ```
   pip install -r requirements.txt
   ```

4. Start application:
   ```
   python run.py
   ```

5. Open in a browser: `http://localhost:5000`

## Usage

1. Select the replication type: Replication or Erasure Coding
2. Enter the corresponding parameters:
   - For Replication: Number of replicas and min_size
   - For Erasure Coding: k (data chunks) and m (coding chunks)
3. Add nodes and configure their OSDs with appropriate storage sizes
4. Select the desired storage unit (GB/TB)
5. Click on "Calculate Capacity" to see the result
6. Optional: Export the configuration or generate a PDF report

## Technology

- Backend: Flask
- Frontend: 
  - Alpine.js for reactive user interface
  - Tailwind CSS for modern design
  - HTMX for interactive elements
- Dark/Light Mode with Tailwind CSS
- PDF generation with ReportLab
- Responsive design for all devices

## Detailed Features

### Replication
- Configurable number of replicas (1-10)
- Adjustable min_size for I/O operations
- Automatic calculation of fault tolerance

### Erasure Coding
- Configurable k/m values
- Optimized storage usage
- Fault tolerance analysis

### Fault Tolerance Analysis
- Node fault tolerance
- OSD fault tolerance
- Multi-node fault tolerance
- Detailed information about storage usage after failures

### User-Friendliness
- Intuitive user interface
- Dark/Light Mode
- Tooltips with explanations
- Responsive design
- Export/Import of configurations
- PDF report generation

## Note

The calculations are based on general recommendations from the Ceph documentation and 
serve as a guideline. For precise capacity planning, you should consult the Ceph documentation 
and consider your specific cluster requirements.