Choosing the Right RAID Setup for Synology NAS
RAID, SHR, and RAID 6: Which One Works Best for Your NAS?
One of the most important things to do when setting up a NAS is to pick the right RAID configuration. The RAID level controls how data is protected, how much space is available for use, and how the system works when disks fail or need to be rebuilt.
When using Synology NAS systems, users usually have to choose between traditional RAID levels and Synology Hybrid RAID. Depending on the user’s experience, the layout of the disks, and the level of risk the business is willing to take, each option has its own pros and cons.
What RAID Does in NAS Systems
RAID is meant to protect against disk failure, not data loss in general. It makes things more available by letting systems keep running even if a drive fails. RAID should never be used instead of backups. It should always be used with a good backup plan.
Traditional RAID 5: Balanced but Sensitive to Risk
RAID 5 uses single-disk parity, which means that it can work even if one drive fails. It strikes a good balance between usable space and backup space, which is why it was popular in small businesses in the past.
But it can take a long time to rebuild large disks. The array is less stable and less powerful during a rebuild. If a second disk fails while rebuilding, all of the data is lost.
RAID 5 works best with smaller arrays that have moderate disk sizes and workloads and where downtime is not a big deal.
Best for:
Small offices, sharing files that aren’t important, and limited disk space
RAID 6: More Protection for Bigger Arrays
RAID 6 builds on RAID 5 by adding dual parity, which means that data won’t be lost if two drives fail. This greatly lowers the risk during rebuild operations, especially with drives that have a lot of space.
The trade-off is that the usable capacity is lower and the write speed is a little slower because of the extra parity calculations. For a lot of business settings, this is a fair price to pay for more durability.
RAID 6 is often used when uptime and data access are more important.
Best for:
SMBs, bigger arrays, workloads that are important to the business, and data that needs to be compliant
Synology Hybrid RAID (SHR): Easy to Use and Flexible
The goal of Synology Hybrid RAID was to make managing RAID easier while making the most of available space. SHR automatically makes the best use of storage when drives of different sizes are used. This is something that traditional RAID can’t do well.
SHR protects a single disk in a way that is similar to RAID 5, while SHR-2 protects two disks in a way that is similar to RAID 6. The main benefit is that it is flexible. Users can slowly add more capacity without having to replace all of their drives at once.
For a lot of companies, SHR makes planning easier and cuts down on the cost of upgrades in the long run.
Best for:
Businesses that are growing, disks of different sizes, and teams that don’t know much about deep storage
Things to think about for capacity efficiency and growth
You need to plan ahead carefully when setting up traditional RAID. Adding capacity often means replacing several drives or rebuilding whole arrays.
SHR lets you make small changes to upgrades. Users can add more storage by replacing one drive at a time without having to change the array’s architecture. This is especially helpful in places where money is tight or growth is hard to predict.
Differences in performance with real workloads
For most file server and backup workloads, RAID 6 and SHR-2 don’t make much of a difference in performance. Modern CPUs and NAS operating systems do a good job of doing parity calculations.
Usually, the operations that rebuild things have a bigger effect on performance. RAID 6 and SHR-2 lower the risk of problems during rebuilds, which is often more important than getting the best performance.
Windows for Risk Management and Rebuilding
Rebuild times get longer as disk sizes get bigger. Longer rebuilds make it more likely that secondary failures will happen. This is why dual-parity setups are becoming the norm in business settings.
Single-parity RAID might still work for small arrays, but the risk goes up a lot as the size of the array grows.
How Synology RAID Works in Real Life
Organizations can choose between traditional RAID and SHR for their Synology NAS systems based on their skill level, growth plans, and risk tolerance. Synology also has tools that let you switch between RAID types in some situations, which makes it less likely that you’ll be stuck with one type of RAID for a long time.
How to Choose the Right RAID for Your Business Size
SHR is easy to use, which makes it good for home users and very small teams. Most of the time, growing SMBs choose SHR-2 or RAID 6 because they are more fault-tolerant. Companies with standardized infrastructure may prefer RAID 6 because it is predictable and fits with their compliance needs.
There is no one right type of RAID. The right choice depends on how big the operation is, how big the disks are, how mature the operation is, and how much downtime it can handle.
A little bit about Epis Technology
Using Synology NAS platforms, Epis Technology helps businesses create storage architectures that can withstand damage. The company focuses on helping businesses with Synology, Microsoft 365, and Google Workspace backups, as well as planning for business continuity, enterprise IT infrastructure, and large storage solutions. Epis Technology helps businesses choose the right RAID strategies, check the risk of rebuilding, and make sure that the storage design meets operational and compliance needs.