Synology RAID Calculator
Estimate usable storage, data protection, and performance for your Synology NAS.
Total physical drives in the array (e.g., 4 for a DS923+).
Capacity of a single drive. Assumes all drives are the same size.
Unit of measurement for disk size.
Choose your desired RAID configuration.
Storage Distribution
| Metric | Value |
|---|---|
| Selected RAID Type | SHR-1 |
| Total Usable Capacity | 24.0 TB |
| Capacity Used for Protection | 8.0 TB |
| Total Raw Capacity | 32.0 TB |
| Fault Tolerance | 1 Disk |
What is a raid calculator synology?
A raid calculator synology is a specialized tool designed to help you understand the implications of different RAID (Redundant Array of Independent Disks) configurations on a Synology Network Attached Storage (NAS) device. Unlike generic RAID calculators, it specifically accounts for Synology’s unique technologies, like Synology Hybrid RAID (SHR). By inputting the number and size of your hard drives, this calculator estimates the total usable storage space, the amount of space dedicated to data protection (redundancy), and the number of disk failures your array can withstand before data loss occurs. This is a crucial first step for anyone setting up a new Synology NAS or planning to expand an existing one.
This tool is essential for home users, small businesses, and IT professionals who need to balance storage capacity, data safety, and cost. A common misunderstanding is that RAID is a backup. It is not. RAID provides redundancy and high availability; if a drive fails, the system can continue to operate. However, it does not protect against file deletion, corruption, or catastrophic events like theft or fire. For that, you need a separate backup solution, which you can learn more about in our guide to {related_keywords}.
RAID Formulas and Explanation
The calculation for usable space varies significantly by RAID type. This raid calculator synology uses the following logic, assuming all disks (N) have the same size (S).
- SHR-1 (Synology Hybrid RAID): With same-sized disks, it behaves like RAID 5. Usable Space = (N – 1) * S. It tolerates one disk failure.
- SHR-2: With same-sized disks, it behaves like RAID 6. Usable Space = (N – 2) * S. It tolerates two disk failures.
- RAID 0 (Striping): Usable Space = N * S. This level offers zero data protection but maximum performance.
- RAID 1 (Mirroring): Usable Space = S. Data is duplicated across all disks. Optimal for two-drive setups needing high redundancy.
- RAID 5 (Striping with Parity): Usable Space = (N – 1) * S. Requires at least 3 disks. It offers a good balance of performance and redundancy.
- RAID 6 (Striping with Dual Parity): Usable Space = (N – 2) * S. Requires at least 4 disks and provides enhanced protection by tolerating two simultaneous disk failures.
- RAID 10 (Stripe of Mirrors): Usable Space = (N / 2) * S. Requires an even number of disks (min 4). It combines the speed of RAID 0 with the redundancy of RAID 1.
| Variable | Meaning | Unit | Typical Range |
|---|---|---|---|
| N | Number of Disks | Count | 2 – 24 |
| S | Size per Disk | TB or GB | 1 – 22 TB |
| Usable Space | Net storage capacity available for data. | TB or GB | Varies |
| Protection Space | Storage capacity used for data redundancy. | TB or GB | Varies |
For more advanced setups, consider looking into our {related_keywords} guide.
Practical Examples
Example 1: A Common Home NAS Setup
Let’s say you have a 4-bay Synology NAS (like a DS923+) and you populate it with four 8 TB hard drives, using the recommended SHR-1 configuration.
- Inputs: 4 Disks, 8 TB each, RAID Type SHR-1
- Calculation: Usable space = (4 – 1) * 8 TB = 24 TB.
- Results: You get 24 TB of usable storage, with 8 TB used for protection. The array can survive the failure of one disk.
Example 2: A Business Setup Prioritizing Redundancy
A small business might use a 6-bay NAS with six 10 TB drives and opt for RAID 6 for extra security.
- Inputs: 6 Disks, 10 TB each, RAID Type RAID 6
- Calculation: Usable space = (6 – 2) * 10 TB = 40 TB.
- Results: This configuration provides 40 TB of usable space, dedicates 20 TB to protection, and can withstand two simultaneous disk failures, which is critical for business continuity. Our article on {related_keywords} explores this further.
How to Use This raid calculator synology
Using this calculator is a straightforward process to plan your storage needs effectively.
- Enter the Number of Disks: Input the total count of hard drives you plan to install in your Synology NAS.
- Specify Disk Size: Enter the capacity of a single drive. This calculator assumes all drives are identical in size for simplicity.
- Select Units: Choose whether the disk size is in Terabytes (TB) or Gigabytes (GB). The results will be displayed in the same unit.
- Choose RAID Type: Select your desired RAID level from the dropdown menu. For most users, Synology Hybrid RAID (SHR) is the recommended starting point due to its flexibility.
- Interpret the Results: The calculator will instantly display your total usable capacity, the space allocated for data protection, and the fault tolerance of your chosen setup. Use the chart and table to visualize the breakdown.
Key Factors That Affect Synology Storage
Several factors beyond the basic calculation influence your final storage pool. Understanding them helps in making an informed decision.
- RAID Type: This is the single most important factor, determining the balance between usable space and redundancy.
- Number of Drive Bays: The physical limitation of your Synology NAS model dictates the maximum number of drives you can install.
- Disk Size Homogeneity: While SHR allows for mixing drive sizes, traditional RAID levels (5, 6) are most efficient with identically sized drives. Using different sizes in a traditional RAID array will result in the capacity of the smallest drive being used for all drives.
- Synology Hybrid RAID (SHR): This proprietary technology is a key advantage. It optimizes storage capacity when using disks of different sizes, a feature not available in standard RAID levels. Check out our {related_keywords} comparison.
- File System Overhead: The Btrfs file system, recommended by Synology, reserves a small percentage of space for metadata and snapshots, which might slightly reduce the final volume size compared to the calculator’s estimate.
- Future Expansion Plans: Consider how you might expand in the future. SHR makes it easier to add larger drives later and incorporate them into the existing storage pool.
Frequently Asked Questions (FAQ)
1. What is the difference between SHR-1 and SHR-2?
SHR-1 provides redundancy for one disk failure, similar to RAID 5. SHR-2 provides redundancy for two disk failures, similar to RAID 6, offering a higher level of data protection.
2. Can I mix hard drive sizes with this raid calculator synology?
This specific calculator assumes all drives are the same size for clear, standardized calculations. However, in a real-world Synology NAS, the SHR and SHR-2 RAID types are specifically designed to optimize storage when you mix drives of different capacities.
3. Is RAID a backup?
No, absolutely not. RAID provides fault tolerance against disk failure. It does not protect against accidental file deletion, data corruption, malware, or physical disasters. You must always maintain a separate backup copy of your important data. Our {related_keywords} page has more details.
4. Which RAID type is the best for a Synology NAS?
For most home and small business users, SHR-1 is the best choice. It offers a great balance of storage efficiency and one-disk-failure protection, plus the flexibility to upgrade with different-sized drives in the future. For larger arrays (6+ disks) or critical data, SHR-2 or RAID 6 is recommended.
5. Why is the usable capacity less than the total size of my drives?
In any RAID level except RAID 0, a portion of the total capacity is used to store redundant information (parity data). This is what allows the array to be rebuilt if a drive fails, ensuring data protection.
6. What happens if a disk fails in an SHR array?
If a disk fails in an SHR-1 array, your data remains accessible but is in a “degraded” state with no protection. You must replace the failed drive with a new one of equal or greater size. The Synology DSM will then automatically rebuild the array, restoring its protection.
7. Why should I use this raid calculator synology instead of a generic one?
This calculator is tailored for Synology users, with a primary focus on SHR (Synology Hybrid RAID), which is not an option in most generic calculators. It provides a more accurate and relevant estimation for planning a Synology NAS setup.
8. What is the difference between RAID 5 and RAID 6?
The main difference is fault tolerance. RAID 5 can withstand a single drive failure. RAID 6 can withstand two simultaneous drive failures, making it more secure but at the cost of one additional drive’s worth of capacity for protection. This is explained more in the {related_keywords} section.