QNAP introduces ZFS-based QuTS hero h4.5.2

QNAP today officially unveiled the QuTS hero h4.5.2 NAS operating system. With numerous improvements and modifications over the previous version, the QuTS hero h4.5.2 operating system adds support for real-time SnapSync, allowing data synchronization for a backup of critical data, and the QSAL (QNAP SSD Antiwear Leveling) that prevents multiple SSDs from failing at once for increased data protection and system reliability

QNAP introduces ZFS-based QuTS hero h4.5.2

QuTS hero is based on the  128-bit ZFS file system, which emphasizes data integrity and includes data self-correction, making it ideal for storing enterprise data that requires data protection. proactive. To provide unrestricted disaster recovery and ransomware protection, QuTS hero supports virtually unlimited snapshots for a complete snapshot versioning system.


With copy-on-write technology, snapshots can be created almost immediately without affecting data writing in progress. Block-based real-time SnapSync system instantly syncs data changes with target storage to ensure the primary NAS and secondary NAS maintain the same data, enabling real-time disaster recovery with a Minimal RPO and no data loss.

As SSD adoption increases, businesses need to prepare for an increased risk of data loss as it becomes difficult to recover data from 'dead' SSDs. The QSAL algorithm regularly detects the life cycle and durability of an SSD RAID. When the life cycle of an SSD is at its last 50%, QSAL will dynamically distribute the over-provisioning space to ensure that each SSD has enough time to rebuild before it reaches the end of its life cycle. This can actually prevent multiple SSD failures at once and improve the reliability of the entire system. QSAL has little effect on storage space usage, but it significantly improves overall data protection for flash storage.

Other specs

  • The main memory read cache (L1 ARC), SSD second-level read cache (L2 ARC), and a ZFS Intent Registry (ZIL) for synchronous transactions with protection against power failure to improve performance and safety.
  • Supports up to 1 petabyte of capacity for individual shared folders.
  • Supports native handling of standard RAID levels and additional RAID ZFS (RAID Z) layouts, and flexible storage pool architecture. RAID Triple Parity and Triple Mirror offer higher levels of data protection.
  • Block-based inline data deduplication, compression, and compaction reduce file size to conserve storage space, optimize performance, and protect the SSD lifecycle.
  • Supports WORM automatic mapping. WORM (one write, many reads) technology is used to prevent modification of saved data. Data in WORM shared folders can only be written and cannot be deleted or modified to ensure data integrity.
  • AES-NI hardware acceleration increases the efficiency of encryption/decryption and data signing over SMB 3.
  • It offers an App Center with applications that can be installed on-demand to allow the NAS to host virtual machines and containers, perform local/remote / cloud backups, create cloud storage gateways, and more.

You can get more information about the QuTS hero functions and NAS models on the firm's website, at this link. Function specifications are subject to change without prior notice.

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