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QNAP QuTS hero
High-performance ZFS-based operating system with greater reliability

QNAP QuTS hero

ZFS-based QuTS hero ensures performance and data integrity

Faced with the explosive growth of data, VDI popularity, increasing SSD adoption, 8K media, and other disruptive IT trends, modern businesses need dependable storage systems to meet future demands. QNAP’s new “QuTS hero” operating system combines the app-based QTS with a 128-bit ZFS file system to provide flexible storage management, comprehensive data protection and optimized performance to meet the needs of business-critical applications.

Empower your business - Upgrade to QuTS hero now!

QNAP QuTS hero

Improve your storage performance with inline data deduplication, compression, and compaction

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Inline Data Deduplication

Inline deduplication is block-based and is carried out before data is written to storage. This greatly optimizes storage usage while significantly decreasing storage capacity requirements.

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Inline Compression

Compress data to reduce storage I/O workloads for improved performance. In VDI, deduplicated virtual desktops are easily cached to achieve optimal virtual desktop performance.

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Inline Compaction

Especially helpful for increasing SSD storage efficiency when highly-repetitive data or massive small files (e.g. transaction logs of banks or e-commerce) are generated. It delivers higher cost efficiency for all-flash storage systems.

Self-Healing ensures data integrity and reliability

Data integrity is key to the reliability of applications and databases. As SSD adoption grows, businesses will encounter a greater risk of data loss as it is difficult to recover data from a dead SSD. Designed with a focus on data integrity, ZFS uses end-to-end checksums to detect and correct silent data corruption caused by hardware defects, bugs in firmware or metadata errors. If an integrity violation is detected, ZFS automatically repairs the damage using data from another mirror before the data is passed to applications. QuTS hero is also WORM (Write Once, Read Many Times) compliant to ensure that data, once written, cannot be modified.

data integrity and reliability
flexible capacity

Robust data protection and flexible capacity utilization with RAID Z

QuTS hero supports conventional RAID configurations (RAID 0 (Striped), RAID 1 (Mirror), RAID 5, RAID 6, RAID 10, RAID 50, and RAID 60) and adds support of RAID Triple Parity for protecting against three-disk failures and Triple Mirror for an identical copy of data stored on three disks. Designed to deal with petabytes of data, RAID Z demonstrates an outstanding tool for creating ready-to-use high-capacity RAID in a matter of seconds.

Multi-level cache technology

Multi-level cache technology with both read and write boosts performance

ZFS simultaneously supports main memory read cache (L1 ARC), SSD second-level read cache (L2 ARC), and ZFS Intent Log (ZIL) for synchronous transactions. The L1 ARC works with the L2 ARC to minimize hard drive access requirements while boosting read performance. The ZIL is useful for applications with large synchronous random write workloads (such as databases), as data will be written to the ZIL first and then written to storage, helping to decrease latency and improve write performance.

Snapshots multiply backup protection


Near-limitless, instant snapshots bring you peace of mind

Supports up to 65,535 snapshots for iSCSI LUN and shared folders (if 1 snapshot is created every hour, 24 snapshots per day, then up to 7 years of snapshots can be created without needing to delete any!). Copy-on-write technology makes snapshot creation almost instantaneous without affecting ongoing data writing.


Snapshot Replica simplifies data protection

Efficiently replicates snapshots to a remote server by copying only the changes made. This can save time and bandwidth, and can be run manually or on a scheduled basis.


SnapSync for remote snapshot replication enables enterprise-class disaster recovery

Supports block-level SnapSync for remote snapshot backups. It only transfers changed data to save required storage space and to improve backup speeds. Real-time SnapSync ensures that when a change is made to the files in the target storage space, a remote replication will be processed. In the event of a primary site failure, SnapSync assists businesses to resume essential services in the shortest time.

(SnapSync will be available from QuTS hero h4.5.2)

Pool over-provisioning ensures write performance

With Pool Over-provisioning, space can be flexibly reserved in a storage pool to allow new data to be written into a complete block even if the pool is almost full, thus improving the performance of fragmented pools. For write-intensive workloads and performance-demanding applications (such as SQL transaction logs, backups, surveillance, and medical videos) you can set higher pool over-provisioning to attain higher write performance.

When big blocks are written to hard drives

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When small blocks are written to SSD

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AES-NI acceleration for SMB 3 signing and encryption

For business applications that demand high-level security, SMB signing and encryption options help enhance file sharing security over the network, but can also negatively impact data transmission performance. QuTS hero NAS supports AES-NI hardware acceleration to increase data signing and encryption/decryption efficiency over SMB 3, boosting system performance while securing sensitive business data.

About NAS migration and RAID management for QuTS hero

As ZFS metadata management is different from Ext4, QTS-based NAS drives cannot be directly used by a QuTS hero-based NAS (and vice versa). Users can install new hard drives to start QuTS hero. If QTS users want to use their existing drives in QuTS hero, they must first ensure all of their drive data has been backed up, and then initialize the hard drives. It is recommended that users thoroughly evaluate their storage needs before installing QuTS hero.

Expanding the storage capacity of a QuTS hero NAS requires adding a complete RAID group to the Storage Pool. Once a RAID group is created, it does not support expanding a RAID group by adding an individual hard drive and does not support migrating RAID levels. Users can allocate spare hard drives for Hot Spare protection or creating additional RAID groups. Users must have enough drive bays to facilitate storage expansion needs in the future when configuring storage in different stages.

Storage expansion methods QuTS hero operating system QTS operating system
Add an individual disk to an existing RAID group
Add a RAID group to a Storage Pool
Replace all member disks of a RAID group with higher-capacity disks
Connect JBOD expansion units

QuTS hero benefits

Data Protection

Data integrity with self-healing capabilities

Outstanding Performance

Integrated SSD read/write caching for business efficiency

Flexibility & Reliability

Flexible capacity management and reliable data backups

Feature-rich QTS Apps

Expand NAS functionality without extra costs

Includes the full QTS App Center

QuTS hero includes the full App Center ecosystem, allowing you to boost your NAS functionality with tools for backup/sync, business, content management, surveillance, productivity, and much more.


Comprehensive backup

HBS centralizes backup, restoration, synchronization, and features QuDedup technology to deduplicate backup data at the source to accelerate backup and restoration. HBS is an incredible asset for managing 3-2-1 backup strategies.


Virtualization and containers

Virtualization Station and Container Station facilitate flexible and economical virtualization applications. The Network & Virtual Switch app boosts interoperability between QNAP NAS, virtual machines, containers, and physical network interfaces while fulfilling easy management of both virtual and physical networks.


File synchronization

Qsync simplifies file sync between NAS, desktops, notebooks, and mobile devices, while also allowing timely group file sharing for optimized teamwork efficiency.


Enterprise cloud backup

Boxafe allows you to backup or sync files, emails, calendars and contacts from Google™ G Suite and Microsoft® Office 365® into the NAS to safeguard enterprise cloud data.

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Fibre Channel support

By installing a Fibre Channel card in your QNAP NAS, it can be added to an existing SAN environment at an affordable price point to fulfill requirements for high-performance storage and backup.

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Cloud gateways

Includes over 20 mainstream cloud service providers, and features HybridMount file-based cloud gateway and VJBOD Cloud block-based cloud gateway services. These allow you to easily mount public cloud storage on NAS for near-unlimited storage potential and low-latency access.

Affordable Fibre Channel SAN storage solution for post-production

Storage Area Networks (SAN) deliver reliable high performance, making it a preferable storage option for post-production environments that require low-latency and fast data transfer. By using a QNAP 16Gb/32Gb Fibre Channel card, a QuTS hero NAS can be easily added to existing SAN environments at an affordable price point. With exceptional IOPS performance, powerful data reduction capabilities, self-healing against silent data corruption, and comprehensive backup/restoration features, QuTS hero NAS provides a perfect high-capacity, FC-compatible data center for professional video studios.

Special edition QNAP NAS with QuTS hero preinstalled

QNAP provides the following special edition QNAP NAS with a preinstalled QuTS hero operating system. Take advantage of high-performance hardware and expandability with the cutting-edge storage management, data protection and optimized features of QuTS hero!


Tiered storage configuration for a QuTS hero NAS

Basic requirements for setup are similar to QTS. We recommend you to follow these steps to acquire optimal storage efficiency and performance for QuTS hero.

Step 1: System Drive & Default Shared Folders The first Storage Pool you create is where the system drive, default shared folders, and apps are stored. In this step, it is recommended to create an SSD RAID with at least two SSDs to attain optimal system performance and efficient app metadata management. (With an all-HDD configuration, the first Storage Pool is also where the system drive and default shared folders are stored.)
Step 2: Read Cache & ZIL Use more SSDs for read cache or ZIL. You can also install QM2 expansion cards to add M.2 SSDs for expanding cache space.
Step 3: Data Storage Allocate HDDs/SSDs to create a RAID for storing files and application data. If needed, you can configure an all-flash configuration for optimal performance.

File transfer performance

Compared to QNAP’s QTS operating system, the latest QuTS hero operating system delivers better data transmission performance and capacity of realizing the full potential of 10GbE data transmission. QuTS hero also outperforms QTS in multiple small file transfers.

Operating System QuTS hero QTS 4.4.1
iSCSI 4KB File Random Write 33917 11191
Random Read 93407 88152
SMB 3.0 4KB File Random Write 34168 11367
Random Read 67922 80669
SMB 3.0
File Transfer
1* 10GB File Upload 1154 1136
Download 1162 1142
SMB 3.0
File Transfer
10000* 1M File Upload 256 26
Download 453 51

Inline data compression helps boost QuTS hero data transfer performance. During simultaneous file transfer from multiple clients, inline data compression enabled QuTS hero performance is 1.6 times faster than QuTS hero or QTS without inline data compression.

The more RAM, the higher ZFS performance

Memory plays a vital role in ZFS performance - especially in high-speed data transfer, data deduplication, ARC, and caching. It is recommended that you install as much memory as possible to attain the highest benefits of ZFS performance and optimized business workloads.


  1. QuTS hero requires a NAS with at least 4GB memory.
  2. Inline Data Deduplication requires a NAS with at least 16GB memory (at least 32GB memory is recommended for optimal performance).
  3. QuTS hero is not supported by dual-controller NAS systems.
  4. As QTS and QuTS hero use different file systems, the NAS system must be re-initialized before switching between QTS and QuTS hero. Users must back up their data and system settings beforehand.


Contact a QNAP Solutions Specialist today to Learn More!