Hyper-V environments cannot function properly without reliable storage, significantly impacting virtual machine (VM) performance. This is because the storage’s primary purpose is to save and retain available data appropriately. As a result, Microsoft Hyper-V offers a variety of storage options that differ in several ways.

However, storing, managing, and accessing data would be impossible without a file system. And for that purpose, Microsoft has two prominent options — Hyper-V Resilient File System (ReFS) and New Technology File System (NTFS).

There is always a debate around Microsoft users — which is better, ReFS or NTFS?

Both formats have some special features that can help you a lot. So, to help you choose the best option, we have created a ReFS vs. NTFS comparison guide. It will show you how both formats work and which is better for you.

What is ReFS?

ReFS, aka Protogon, is a file system introduced by Microsoft with Windows Server 2012. The goal of ReFS was to create an advanced file that could safely store large amounts of data. It contains built-in resilience, automatic integrity checking, data scrubbing, and data degradation prevention.

Furthermore, the ReFS file system can work in tandem with Storage Spaces, a storage virtualization layer used for data mirroring, striping, and storage pool sharing. As a result, ReFS can detect corrupted files on a disc and repair them automatically. The goal of ReFS was to develop a file system that is resistant to data corruption and offers on-demand scalability for large environments.

What is NTFS?

NTFS is a Microsoft file system that was included by default in previous versions of Windows and Windows Server. The NTFS file system includes several features for managing disc files and preventing disc failures.

These include security access control (ACL), improved metadata, disc space utilization, file system journaling, encryption, sparse files, and disc quotas. Furthermore, Cluster Shared Volumes can be used in conjunction with the Hyper-V role, allowing multiple nodes in a failover cluster to access a shared disc containing an NTFS volume.

ReFS vs NTFS: Advantages

ReFS Advantages

  • Resiliency: Integrity streams, Storage Spaces integration, data salvaging, and proactive error correction are among the new features introduced by ReFS. As a result, it can precisely detect and correct corruptions while remaining online.
  • Performance: ReFS performance enhancements include real-time tier optimization, block cloning, and sparse VDL. As a result, it can provide both high-performance and capacity-efficient storage while also improving the performance of virtualized workloads.

NTFS Advantages

ReFS vs. NTFS: Features

ReFS Features

ReFS has a maximum volume size of 262,144 exabytes, compared to NTFS’s 16 exabytes. ReFS has a maximum file size of 16 exabytes, whereas NTFS has a maximum file size of 16 exabytes. ReFS allows up to 32,768 characters in a file name, whereas NTFS only allows 255 characters.

Other ReFS features include:

  • Improved Hyper-V performance.
  • Support for integrity streams that use checksums to evaluate the state of data.
  • Data striping for RAID-like performance.

In version 1.2, Microsoft added support for alternate data streams, allowing ReFS to work with Microsoft SQL Server deployments. Other notable updates include adding data deduplication support in ReFS version 3.2 with the release of Windows Server version 1709.

NTFS Features

Self-healing NTFS: The NT file system includes a self-healing feature that detects and repairs corruption on an NTFS volume or files in a single step, eliminating the need to run a disc repair utility.

ACL (Access Control List): With NTFS, administrators can now use access control lists (ACL) to determine who else can access or modify a specific file.

File-Level Encryption: File-level encryption is a noticeable feature of the NTFS file system that protects your file content from unauthorized access.

Disk Quotas: The main feature of NTFS v3 is Disk Quotas, which allows administrators to limit a user’s disk space usage. It also keeps track of how much disc space each user consumes.

Reliable File System: The NTFS File System performs automatic recovery operations. If the system unexpectedly shuts down, the NT file system checks for consistency using the transaction log and journal file.

File Compression: The NTFS file system includes a new and noteworthy feature called file compression. This feature allows users to compress large files to better use disc space.

ReFS vs NTFS: Reliable

Data protection tools are available in both NTFS and ReFS. However, ReFS is superior because it no longer requires the chkdsk command.

The chkdsk command is sometimes required to repair the disc in NTFS format, especially if the power is abruptly cut off. If bad sectors happen in the data area at this time, the data may be corrupted.

The ReFS format, on the other hand, supports automatic verification and repair and does not require the chkdsk repair command, reducing the impact of bad sectors on data.

ReFS vs. NTFS: Performance

Both NTFS and ReFS have features that allow them to significantly improve file system performance.

Transactional NTFS was introduced in Windows Server 2008, allowing it to monitor system performance through transactions. In this case, file operations are carried out via atomic transactions, which means you can configure a transaction to apply multiple file changes in the system.

The transaction is designed so that all or none of the operations will succeed. In the event of a system failure, the adopted changes are written to disc, and any unfinished transactional work is rolled back. Thus, transactions enable you to carry out operations without interruptions or errors while saving progress.

Disk quotas, file compression, and resizing are other options for improving performance. Disk quotas allow the administrator to allocate a certain amount of disc space to users and detect when the limit is reached. Furthermore, NTFS can compress system files using compression algorithms, increasing storage capacity. Finally, the resizing feature allows you to increase or decrease the size of an NTFS volume by using unallocated disc space on the system.

As previously stated, ReFS can be integrated with Windows Storage Spaces, allowing for real-time tier optimization. In ReFS, a volume is divided into two sectors: performance tier and capacity tier. Each of these tiers has its type of drive and resilience.

The following features were added specifically to improve Hyper-V VM performance. First, ReFS’ sparse VDL (Valid Data Length) feature allows it to rapidly zero files, allowing you to create virtual hard disc (VHD) files in seconds.

Another feature is block cloning, which is used when working with dynamic workloads like VM cloning and checkpoint merging. In this case, block cloning is done based on metadata rather than file data. As a result, copy operations perform faster, and disc overhead is reduced.

ReFS vs NTFS: Scalability

When comparing the scalability of ReFS and NTFS, the former can support remarkably large data volumes. For example, NTFS has a theoretical maximum capacity of 16 exabytes, whereas ReFS has 262,144 exabytes. As a result, ReFS is more easily scalable than NTFS and provides better storage performance.

It is also worth noting that in NTFS and ReFS, the maximum file name length is 255 characters, whereas the maximum path name length is 32,768 characters. ReFS, on the other hand, supports longer file names and file paths by default. In the case of NTFS, you must manually disable the short character limit.

ReFS vs NTFS: Usage

We can conclude from the above NTFS vs. ReFS differences that the two file systems are used in very different ways. NTFS is intended for general-purpose use in a variety of configurations and workloads. It can be used almost anywhere.

However, ReFS is merely a supplement to NTFS. Therefore, it is appropriate for customers who require the availability, resilience, and/or scale that ReFS provides. To be more specific, ReFS is better suited for the following configurations and scenarios:

Storage Spaces is a technology that enables software RAID. You can use Storage Spaces to group three or more drives into a storage pool and then create volumes using capacity from that pool. As a result, you can protect your data from drive failures.

Storage Spaces Direct (S2D) is the next step in the evolution of Storage Spaces. It combines Storage Spaces technology with other technologies, allowing it to combine multiple servers’ “Local Disk” into a large storage resource pool. As a result, it can save space, electricity, and air conditioning, among other things, and it supports the “Scale-Out” operation structure and the Storage Spaces structure.

Suppose you want to use software or hardware that requires reliability and resilience (such as software RAID tools, hardware RAID, VM, and so on). In that case, ReFS is a good option that will provide significant data security benefits.

Can ReFS Replace NTFS?

As the above shown, the question of ReFS vs NTFS is still relevant because ReFS is still very limited in its functionality compared to NTFS. For example, ReFS lacks critical NTFS features such as data compression, encryption, transactions, hard links, disc quotas, and extended attributes. Another limitation of ReFS is that, unlike NTFS, it does not allow you to boot Windows from a ReFS volume.

The reason can explain the limited functionality it was designed: to protect against data corruption and increase file system scalability. ReFS, on the other hand, cannot be dismissed as a less efficient file system because it has many features that can improve its performance.

Thus, the choice between ReFS and NTFS is primarily determined by the task at hand. NTFS is currently a better option for storing less sensitive data and having more granular control over files in the system. ReFS, on the other hand, may appeal to users who need to manage data in large-scale environments and want to ensure data integrity in the event of file corruption.

ReFS vs. NTFS: Which One To Use?

Microsoft Hyper-V is effective virtualization software that is constantly being improved. In addition, because data storage requirements have changed dramatically over time, cutting-edge ReFS has been introduced as a file system that can overcome the issues in NTFS.

Compared to NTFS, the primary goal of ReFS is to improve system resilience to data corruption and ensure extensive scalability. However, ReFS is still a young file system, and its functionality isn’t as mature as that of NTFS. Consider the scale of your business operations, your virtual environment’s needs, and your data’s sensitivity when deciding between the two options.

So, on a parting note, we can say both file formats are great in a certain situations.

That’s our wrap. For more guides, stay tuned only here.

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