RAID Calculator Synology
Plan your storage capacity with high precision using our raid calculator synology tool.
Configure Drive Bays
0 TB
0 TB
0 TB
0 Drive(s)
Storage Allocation Visualization
■ Usable ■ Protection ■ Unused
Formula: Usable Capacity = Total Disk Sum – Parity/Mirroring overhead based on selected RAID configuration.
What is a RAID Calculator Synology?
A raid calculator synology is an essential planning tool for anyone configuring a Network Attached Storage (NAS) device. When you insert hard drives into a Synology NAS, you don’t simply add up all the storage. Depending on the RAID (Redundant Array of Independent Disks) configuration you choose, some space is reserved to protect your data in case a drive fails.
Using a raid calculator synology allows you to visualize how different RAID levels like RAID 5, RAID 6, or Synology’s proprietary SHR (Synology Hybrid RAID) will affect your usable storage. It helps IT managers and home enthusiasts make informed decisions about drive purchases and data safety requirements.
RAID Calculator Synology Formula and Mathematical Explanation
The math behind storage redundancy varies significantly based on the array type. Here is how our raid calculator synology computes the values:
| RAID Type | Mathematical Formula | Variable Explanation | Min Drives |
|---|---|---|---|
| RAID 0 | Sum(Drives) | All drives added together; no protection. | 1 |
| RAID 1 | Min(Drive1, Drive2) | The capacity of the smallest drive in a pair. | 2 |
| RAID 5 | (N – 1) * Capacity | Total drives minus one drive for parity. | 3 |
| RAID 6 | (N – 2) * Capacity | Total drives minus two drives for parity. | 4 |
| SHR | Complex Summation | Largest drive is used for redundancy; others usable. | 1 |
Variables Table
| Variable | Meaning | Unit | Typical Range |
|---|---|---|---|
| N | Number of Disks | Count | 1 – 24 |
| C | Drive Capacity | Terabytes (TB) | 1 – 22 TB |
| P | Parity Overhead | Terabytes (TB) | 1x or 2x Capacity |
Practical Examples (Real-World Use Cases)
Example 1: Home Media Server
A user has four 4TB drives in a Synology DS423+. Using the raid calculator synology with SHR, the total raw capacity is 16TB. The usable space would be 12TB, with 4TB used for protection. This allows one drive to fail without losing any movies or photos.
Example 2: Small Business Database
An office uses six 8TB drives in a RAID 6 configuration for maximum safety. The raid calculator synology shows that with RAID 6, two drives are used for protection. Usable space = (6-2) * 8TB = 32TB. Even if two drives fail simultaneously, the business data remains intact.
How to Use This RAID Calculator Synology
- Enter Drive Capacities: Input the size of each drive you plan to install in the “Drive Bays” section.
- Select RAID Type: Choose a configuration from the dropdown. Note that SHR is often best for mixed drive sizes.
- Review Results: The raid calculator synology instantly updates the Usable Capacity and Protection statistics.
- Check the Chart: Look at the visual breakdown to see how much of your raw storage is actually available for data.
Key Factors That Affect RAID Calculator Synology Results
- Drive Size Consistency: In traditional RAID (5/6), if you mix a 4TB and 8TB drive, the 8TB drive is treated as a 4TB drive. SHR avoids this waste.
- Fault Tolerance: RAID 1/5/SHR can survive 1 drive failure. RAID 6/SHR-2 can survive 2.
- Btrfs vs EXT4: While not calculated in raw RAID, the file system adds a small amount of overhead (usually ~4%).
- TB vs TiB: Hard drive manufacturers use Decimal (1000), but Synology OS uses Binary (1024). This makes a 10TB drive appear as ~9.1 TiB in the OS.
- Hot Spares: If you designate a drive as a “Hot Spare,” it provides 0 usable storage until another drive fails.
- Hardware Limitations: Some older NAS models have a maximum single volume size (e.g., 16TB or 108TB).
Frequently Asked Questions (FAQ)
1. Why is my usable space lower than the sum of my drives?
RAID configurations (except RAID 0 and JBOD) use parity or mirroring to ensure data safety, which consumes drive space.
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 “downgrade” without deleting the volume.
3. What is SHR?
Synology Hybrid RAID (SHR) is an automated storage management system that makes it easier to mix drives of different sizes.
4. Does this calculator account for the OS?
This raid calculator synology estimates RAID-level capacity. DSM (the OS) takes a few gigabytes across all drives for the system partition.
5. Is RAID a backup?
No! RAID protects against hardware failure, but not against accidental deletion, fire, or ransomware. Always keep an offsite backup.
6. What happens if I use different drive sizes in RAID 5?
Traditional RAID 5 will limit all drives to the capacity of the smallest drive in the array.
7. Can I use SSDs and HDDs in the same array?
It is not recommended and often blocked by Synology because the array speed will be limited to the slowest drive.
8. Is RAID 10 better than RAID 6?
RAID 10 offers better performance but less usable space than RAID 6 in arrays with many disks.
Related Tools and Internal Resources
- NAS Selector Guide: Find the perfect Synology hardware for your needs.
- Disk Compatibility List: Check which HDDs work with your Synology model.
- RAID Comparison Guide: A deep dive into RAID 0, 1, 5, 6, 10 and JBOD.
- Synology SHR Explained: Why Synology Hybrid RAID is a game changer.
- 3-2-1 Backup Strategies: Learn how to secure your NAS data properly.
- Storage Manager Tips: How to optimize your volume performance.