raid calculator synology

Calculate storage capacity, redundancy, and unused space for your Synology NAS configuration.

Please enter valid positive numbers for drive sizes.

What is a RAID Calculator Synology?

A raid calculator synology is an essential tool for NAS (Network Attached Storage) users to plan their storage infrastructure. Unlike standard RAID calculators, a raid calculator synology accounts for Synology's unique Hybrid RAID (SHR) technology, which allows for mixing drives of different sizes while maximizing available space.

Whether you are a home user storing family photos or a business managing terabytes of critical data, using a raid calculator synology helps you understand the trade-offs between performance, redundancy, and capacity. Many users mistakenly believe that adding a 10TB drive to a 4TB array will immediately grant them 10TB of extra space; this tool clarifies exactly how much space is "wasted" or used for data protection.

RAID Calculator Synology Formula and Mathematical Explanation

The mathematical logic behind the raid calculator synology varies depending on the selected RAID level. For standard RAID levels, the formula is predictable, but for SHR, the logic is more dynamic.

Step-by-Step Derivation

• RAID 0: Sum of all drive capacities. No redundancy.
• RAID 1: Capacity of the smallest drive (mirrored).
• RAID 5: (Number of Drives – 1) × Capacity of the smallest drive.
• RAID 6: (Number of Drives – 2) × Capacity of the smallest drive.
• SHR: Sum of all drives minus the capacity of the largest drive (simplified).

Variable	Meaning	Unit	Typical Range
N	Number of Drives	Count	2 – 24
Cmin	Smallest Drive Capacity	TB	1 – 22 TB
Cmax	Largest Drive Capacity	TB	1 – 22 TB
R	Redundancy Overhead	TB	1x or 2x Drive Size

Practical Examples (Real-World Use Cases)

Example 1: Mixed Drive SHR Setup

Suppose you use the raid calculator synology for a 4-bay NAS with two 4TB drives and two 8TB drives. In a standard RAID 5, you would only get 12TB (3 x 4TB), and 8TB would be wasted. However, with SHR, the raid calculator synology shows you get 16TB of available space because SHR creates multiple RAID slices to utilize the extra space on the 8TB drives.

Example 2: High Redundancy RAID 6

A business uses four 10TB drives. The raid calculator synology for RAID 6 calculates: (4 – 2) × 10TB = 20TB available. While 20TB is used for protection, the system can survive the simultaneous failure of any two drives, providing maximum peace of mind.

How to Use This RAID Calculator Synology

1. Select RAID Type: Choose from SHR, RAID 5, RAID 10, etc., based on your redundancy needs.
2. Input Drive Sizes: Enter the capacity of each drive in Terabytes (TB).
3. Review Results: The raid calculator synology instantly updates the "Available Capacity" and "Protection" values.
4. Analyze the Chart: Look at the storage distribution to see if any space is "Unused" due to drive size mismatches.

Key Factors That Affect RAID Calculator Synology Results

• Drive Formatting: Manufacturers define 1TB as 1,000,000,000,000 bytes, but DSM (DiskStation Manager) uses binary (TiB), meaning a 10TB drive shows as ~9.1TB.
• Btrfs vs EXT4: The file system consumes a small percentage of the calculated raid calculator synology result for metadata.
• SHR Flexibility: SHR is the most popular choice in the raid calculator synology because it allows for future expansion with larger drives.
• Minimum Drive Count: RAID 5 requires 3 drives, while RAID 6 and SHR-2 require at least 4.
• Hot Spares: If you designate a drive as a hot spare, it is not included in the raid calculator synology capacity calculation.
• Hardware Limitations: Some older Synology models have a 16TB or 108TB single volume size limit, regardless of the raid calculator synology output.

Frequently Asked Questions (FAQ)

1. Why is my available space lower than the raid calculator synology shows?

This is usually due to the difference between decimal TB (used by manufacturers) and binary TiB (used by Synology DSM), plus system partition overhead.

2. Can I change RAID levels later?

Yes, Synology allows migrating from RAID 1 to RAID 5, or SHR to SHR-2, but you cannot go "downwards" (e.g., RAID 5 to RAID 1) without formatting.

3. Is SHR better than RAID 5?

For most users, yes. The raid calculator synology demonstrates that SHR provides better space utilization when mixing drive sizes.

4. What happens if two drives fail in RAID 5?

In a RAID 5 or SHR-1 setup, the volume will crash and data will be lost if two drives fail simultaneously. Use RAID 6 or SHR-2 for 2-drive fault tolerance.

5. Does the raid calculator synology account for SSD cache?

No, SSD cache drives do not add to the storage capacity; they only improve read/write performance.

6. Can I mix HDD and SSD in the same RAID?

Technically possible but highly discouraged as the slowest drive (HDD) will bottleneck the entire array.

7. How much space does Synology DSM take?

DSM reserves a small portion (usually a few GB) on every drive for the operating system and swap space.

8. Why does RAID 10 show 50% capacity?

RAID 10 mirrors all data first and then stripes it, meaning half your total raw capacity is dedicated to protection.