Synology Hybrid Raid Calculator

SHR Type

Number of Drives

Drive Size (TB per drive)

All Drives Same Size?

The Synology Hybrid RAID Calculator is a specialized storage planning tool designed for users of Synology NAS systems. It helps users estimate how much usable storage capacity they will get when using Synology Hybrid RAID (SHR) configurations.

What this tool is used for:

This calculator is used to determine:

Total usable storage capacity in a SHR array
Storage loss due to redundancy (fault tolerance)
Drive utilization efficiency
Comparison between SHR-1 and SHR-2 configurations
Expansion planning for future drives

Required Inputs:

To perform calculations, the tool typically needs:

Number of hard drives or SSDs
Capacity of each drive (e.g., 4TB, 8TB, 12TB)
RAID type selection:
- SHR-1 (single-disk redundancy)
- SHR-2 (dual-disk redundancy)

Expected Outputs:

Users expect the following results:

Total usable capacity (TB/GB)
Reserved redundancy space
Wasted or unallocated space (if any)
Effective storage efficiency percentage
Recommended upgrade or expansion insights

Core Calculation Logic:

SHR is not a simple RAID level; it dynamically combines RAID 1, 5, and 6 behaviors depending on disk sizes. However, a simplified interpretation is:

SHR-1 ≈ total capacity − 1 largest disk equivalent
SHR-2 ≈ total capacity − 2 largest disk equivalents

Actual Synology SHR logic is more advanced and optimizes mixed drive sizes, but this approximation is widely used for planning.

INTRODUCTION

The Synology Hybrid RAID Calculator is an essential planning tool for anyone building a NAS (Network Attached Storage) system using Synology devices. Unlike traditional RAID systems, SHR is designed to maximize storage efficiency while maintaining redundancy and data safety.

When users invest in multiple hard drives, they often struggle to understand how much usable space they will actually get after redundancy is applied. This calculator removes the guesswork by estimating real-world storage capacity based on drive configuration and RAID type.

Whether you are a home user backing up personal data or a business managing large-scale storage, this tool ensures you make informed decisions before purchasing drives.

WHAT IS SYNLOGY HYBRID RAID (SHR)?

SHR is a proprietary RAID management system developed by Synology. It simplifies RAID management by automatically optimizing storage across drives of different sizes.

Key features of SHR:

Flexible drive size mixing
Automatic redundancy management
Easy expansion with additional drives
Improved storage efficiency over traditional RAID in mixed setups

There are two main types:

SHR-1: Protects against one drive failure
SHR-2: Protects against two drive failures

HOW TO USE THE SYNLOGY HYBRID RAID CALCULATOR

Using the calculator is simple and user-friendly. Follow these steps:

Step 1: Enter Number of Drives

Input how many drives you plan to use in your NAS setup (e.g., 4, 6, 8 drives).

Step 2: Enter Drive Sizes

Specify the capacity of each drive. You can input identical or mixed sizes.

Step 3: Select RAID Type

Choose between:

SHR-1 (single redundancy)
SHR-2 (double redundancy)

Step 4: Click Calculate

The tool processes your input and provides:

Total usable storage
Redundancy allocation
Efficiency percentage

PRACTICAL EXAMPLE

Example Setup:

5 drives of 8TB each
SHR-1 configuration

Step-by-step:

Total raw storage = 40TB
SHR-1 reserves 1 drive equivalent (8TB)
Usable storage = 32TB

Result:

Usable capacity: ~32TB
Redundancy: 8TB
Efficiency: 80%

This shows how SHR protects data while still offering high usable storage.

BENEFITS OF USING THE SHR CALCULATOR

1. Accurate Storage Planning

Avoid overestimating usable space when buying drives.

2. Cost Optimization

Helps users choose the most cost-effective drive combinations.

3. Better RAID Understanding

Simplifies complex RAID calculations into clear results.

4. Safe Data Protection Planning

Ensures proper redundancy for drive failures.

5. Ideal for Mixed Drives

Especially useful when combining different drive sizes.

6. Business Storage Forecasting

Helps IT teams predict future storage needs.

WHY SHR IS BETTER FOR MANY USERS

Traditional RAID systems often require identical drives, which limits flexibility. SHR solves this by intelligently balancing storage allocation.

Advantages include:

Easier upgrades
Better space utilization
Lower waste in mixed drive environments

This is why many NAS users prefer SHR over RAID 5 or RAID 6.

LIMITATIONS OF THE CALCULATOR

While highly useful, the calculator is still an estimate. Real-world SHR performance may vary due to:

File system overhead
Drive formatting differences
Synology system reserved space
Mixed drive optimization behavior

WHO SHOULD USE THIS TOOL?

Home NAS users
Small businesses
IT administrators
Media storage professionals
Backup solution planners

ADVANCED TIPS FOR BETTER STORAGE PLANNING

Always leave at least one drive worth of redundancy
Prefer identical drives for maximum efficiency
Use SHR-2 for critical business data
Plan for future expansion before filling all bays

FAQs with answers (20):

1. What is a Synology Hybrid RAID Calculator?

It is a tool that estimates usable storage in Synology SHR setups.

2. Is SHR better than RAID 5?

In many mixed-drive setups, yes.

3. What is SHR-1?

It protects against one drive failure.

4. What is SHR-2?

It protects against two drive failures.

5. Can I mix different drive sizes?

Yes, SHR is designed for mixed drives.

6. Does the calculator show exact values?

It shows close estimates, not exact system values.

7. Is SHR suitable for businesses?

Yes, especially SHR-2 for critical data.

8. How does SHR handle extra space?

It optimizes leftover capacity across drives.

9. Can I expand SHR later?

Yes, you can add drives anytime.

10. Does SHR waste storage?

Less than traditional RAID systems in mixed setups.

11. What happens if a drive fails?

Data remains safe due to redundancy.

12. Is SHR faster than RAID?

Performance is similar to RAID 5/6.

13. Do I need identical drives?

No, but it improves efficiency.

14. What is usable capacity?

It is the actual storage available for files.

15. Does SHR support SSDs?

Yes, both HDDs and SSDs are supported.

16. Can SHR-2 use more space?

No, it sacrifices more capacity for safety.

17. Is internet required for calculation?

No, it works offline.

18. What is redundancy in SHR?

It is reserved storage for data protection.

19. Can I convert RAID to SHR?

Yes, Synology supports migration.

20. Why use a calculator before buying drives?

To avoid wasting money on incorrect storage expectations.

CONCLUSION

The Synology Hybrid RAID Calculator is an essential tool for anyone planning a NAS storage system using Synology devices. It simplifies one of the most confusing aspects of storage planning—understanding how much usable space you actually get after redundancy is applied. By allowing users to input drive sizes and RAID types, it provides clear and practical estimates that help avoid costly mistakes.