1. What is Synology RAID Capacity Calculation?

The RAID capacity calculation determines the usable storage space in a Synology NAS array based on the smallest disk size, number of disks, and parity configuration. It helps plan storage needs before setting up a RAID array.

2. How Does the Calculator Work?

The calculator uses the RAID capacity formula:

Where:

• \( \min(disk) \) — Size of the smallest disk in the array (GB)
• \( disks \) — Total number of disks in the array
• \( parity \) — Number of parity disks (depends on RAID type)

Explanation: The capacity is limited by the smallest disk in the array, and parity disks reduce the total usable space.

3. Importance of RAID Capacity Calculation

Details: Accurate capacity calculation is crucial for storage planning, budgeting, and ensuring the RAID configuration meets your needs.

4. Using the Calculator

Tips: Enter the smallest disk size in GB, total number of disks, and number of parity disks. For SHR-1, parity is 1; for SHR-2, parity is 2.

5. Frequently Asked Questions (FAQ)

Q1: Why does the smallest disk size determine capacity?
A: In most RAID configurations, all disks are limited to the size of the smallest disk to maintain data integrity.

Q2: What's the difference between SHR-1 and SHR-2?
A: SHR-1 has 1 disk parity (can survive 1 disk failure), SHR-2 has 2 disk parity (can survive 2 disk failures).

Q3: Can I mix different size disks in Synology RAID?
A: Yes, but the usable space will be limited by the smallest disk in each "tier" of disk sizes.

Q4: How much space does parity use?
A: Each parity disk uses the equivalent of one full disk's worth of space for redundancy.

Q5: What's the optimal number of disks for a Synology NAS?
A: Depends on needs - 2-4 disks for home use, 4-8 for small business, 8+ for enterprise with appropriate RAID level.