Active-active high availability

Both controllers are stated to process I/O concurrently. The supplied description also states that if one controller fails, the other takes over the NVMe drives and network IPs through the PCIe Non-Transparent Bridge internal connection.

• SMB, NFS, iSCSI and Fibre Channel services are stated to remain available without front-end reconnection.

Write-cache protection and data integrity

Each controller includes a 64GB M.2 SSD for Copy-to-Flash protection. The supplied description states that the BBU helps write cached DRAM data to the M.2 SSD protection area during an unexpected power outage.

QES and snapshots

The supplied description identifies QES as based on the FreeBSD kernel and ZFS file system and states support for up to 65,535 snapshots for iSCSI LUNs and shared folders using Copy-on-Write technology.

NVMe all-flash performance

The 24 bays support hot-swappable dual-port U.2/U.3 NVMe PCIe SSDs. The supplied description states performance of over 616,000 iSCSI 4K random read IOPS and throughput up to 15GB/s.

Networking, expansion and storage QoS

Each controller includes four 10GbE SFP+ ports, three Gigabit Ethernet RJ45 ports and two PCIe Gen 3 x8 slots. The supplied description also lists QNAP Storage QoS for stable and predictable performance from a single storage pool.

Important supplied operating notes

• Use only one DIMM type at a time; do not mix RDIMM and LRDIMM memory.
• The USB 3.2 Gen 1 ports are for engineering purposes only and do not support external storage drives or UPS units.
• The typical operating power figure of 754.61W was tested with drives fully populated.