Synology Shr Calculator

Synology SHR Calculator

Calculating usable storage…

Results

Total Raw Capacity
Usable Capacity
Fault Tolerance

In today’s data-driven world, optimizing storage space is critical. Synology Hybrid RAID (SHR) is a flexible RAID system that allows users to mix drives of different sizes while maintaining redundancy. The Synology SHR Calculator is a powerful tool designed to simplify storage planning, helping you quickly determine usable capacity, raw capacity, and fault tolerance for your NAS setup.

Whether you are an IT professional, a home user, or managing a small business, this calculator eliminates guesswork, providing precise storage metrics in seconds.

What is the Synology SHR Calculator?

The Synology SHR Calculator is a user-friendly tool for planning storage in Synology NAS devices. It computes:

  • Total Raw Capacity – the combined storage of all drives installed.
  • Usable Capacity – the actual storage available after redundancy is applied.
  • Fault Tolerance – the number of drives that can fail without data loss.

It supports SHR-1 (single disk fault tolerance) and SHR-2 (dual disk fault tolerance), making it suitable for a variety of storage setups.

How to Use the Synology SHR Calculator: Step-by-Step

Using the SHR Calculator is simple. Follow these steps:

  1. Enter Number of Drives
    Specify how many drives you plan to install in your NAS.
  2. Enter Drive Size (TB)
    Provide the storage capacity of each drive in terabytes. Drives can be of the same or different sizes, but the calculator assumes uniform sizes for simplicity.
  3. Select RAID Type
    Choose SHR-1 for single disk fault tolerance or SHR-2 for dual disk fault tolerance.
  4. Click Calculate
    The calculator displays a progress bar, then shows your storage results.
  5. View Results
    Results include Total Raw Capacity, Usable Capacity, and Fault Tolerance.
  6. Optional: Copy or Share Results
    Use the Copy button to save results to your clipboard or Share to send them via supported devices.
  7. Reset Inputs
    Use the Reset button to clear inputs and start a new calculation.

Practical Example

Imagine you have the following setup:

  • Number of Drives: 5
  • Drive Size: 4 TB
  • RAID Type: SHR-1

After entering these values and clicking Calculate, the calculator will provide:

  • Total Raw Capacity: 20 TB (5 × 4 TB)
  • Usable Capacity: 16 TB ((5 − 1) × 4 TB)
  • Fault Tolerance: 1 Drive

This shows that even if one drive fails, your data remains safe, and you can still access 16 TB of usable storage.

Benefits of Using the Synology SHR Calculator

  • Time-Saving: Quickly calculates storage metrics without manual calculations.
  • Accuracy: Uses the correct formula for SHR-1 and SHR-2 setups.
  • Ease of Use: Simple inputs produce instant results.
  • Flexibility: Supports different numbers of drives and RAID types.
  • Planning Tool: Helps estimate storage for home or business NAS environments.

Key Features

  • Supports SHR-1 and SHR-2 configurations.
  • Calculates raw capacity, usable capacity, and fault tolerance.
  • Progress bar for smooth user experience.
  • Copy and share results for documentation.
  • Clean interface suitable for beginners and professionals alike.

Use Cases

The Synology SHR Calculator is ideal for:

  • Home users planning NAS storage for personal media.
  • Small businesses managing backups and shared storage.
  • IT professionals designing NAS solutions with mixed drive sizes.
  • Data centers calculating redundancy and capacity.
  • Students and tech enthusiasts learning about RAID and storage planning.

Tips for Optimal Use

  • Always verify drive sizes and number of drives before calculating.
  • Choose SHR-2 if data redundancy is a high priority.
  • Remember that usable capacity will always be less than raw capacity due to redundancy.
  • Use the Copy and Share features to include results in planning documents.
  • Plan ahead: consider future expansion by leaving spare capacity for additional drives.

Frequently Asked Questions (FAQ)

1. What is SHR?
SHR (Synology Hybrid RAID) is a RAID system that allows different-sized drives while providing redundancy.

2. What’s the difference between SHR-1 and SHR-2?
SHR-1 tolerates one drive failure, while SHR-2 can handle two drive failures.

3. Can I use different drive sizes?
Yes, SHR supports mixed drive sizes, but this calculator assumes uniform sizes.

4. What is total raw capacity?
The sum of all installed drives’ storage before accounting for redundancy.

5. What is usable capacity?
The amount of storage available after redundancy is applied.

6. What does fault tolerance mean?
The number of drives that can fail without losing data.

7. Can I share the results?
Yes, the Share button allows sending results on devices supporting web sharing.

8. Is this tool free to use?
Yes, it’s fully accessible without cost.

9. Can I reset the calculator?
Yes, click the Reset button to start over.

10. How many drives do I need for SHR-1?
Minimum 2 drives are required for SHR-1.

11. How many drives do I need for SHR-2?
Minimum 3 drives are required for SHR-2.

12. Can I plan for future expansion?
Yes, by considering the number of drives you may add later.

13. Will this calculator work for RAID 5 or RAID 6?
Yes, SHR-1 is similar to RAID 5, SHR-2 is similar to RAID 6.

14. Can I calculate with non-integer drive sizes?
Yes, fractional sizes are supported (e.g., 3.5 TB).

15. Does it account for drive performance?
No, it only calculates storage capacity and fault tolerance.

16. Can I use it for business NAS systems?
Yes, it’s ideal for both home and business NAS setups.

17. Is there a limit to the number of drives?
No strict limit, but practical NAS devices typically support up to 12–24 drives.

18. Can I use this for Synology DiskStations only?
While designed for Synology NAS, the calculations are applicable to any SHR-compatible system.

19. Does it provide real-time updates?
Yes, the progress bar simulates real-time calculation, and results are displayed instantly.

20. Can I copy the results to a spreadsheet?
Yes, use the Copy button and paste into any spreadsheet application for planning.

Conclusion

The Synology SHR Calculator is an essential tool for anyone managing NAS storage. It provides instant insights into usable capacity, raw capacity, and fault tolerance, making storage planning efficient and error-free. Whether you are setting up a home media server or a business backup solution, this calculator ensures your data is secure and your storage is optimized.

By simplifying the complexities of SHR storage calculations, this tool saves time, reduces errors, and allows for smarter storage decisions.