QNAP 12 (+6) Bay 10GBE Nas And Iscsi/ IP - TES-1885U-D1531-32G-US

QNAP TES-1885U-D1531-32G-US 12+6-Bay 10GbE Enterprise NAS and iSCSI Storage

Overview

The QNAP TES-1885U-D1531-32G-US is a rackmount enterprise NAS and iSCSI IP-SAN built for organizations that need server-class compute alongside high-density storage — surveillance archives, virtualization datastores, and large-scale file services where a consumer-grade NAS simply runs out of headroom. Powered by an Intel Xeon D-1521 quad-core processor at 2.4 GHz (turbo to 2.7 GHz) and shipping with 32 GB RDIMM DDR4 ECC RAM, this unit runs QNAP's QES enterprise operating system and supports VMware vSphere 6.5 and Citrix XenServer, putting it squarely in the enterprise virtualization tier. Browse the full QNAP storage and networking line to compare models in this family.

Key Features

• 12 + 6 Drive Bays (SAS/SATA): The primary 12 bays accept 3.5-inch SAS or SATA hard drives; the additional 6 bays are dedicated SATA SSD slots. That combination lets you tier storage on a single appliance — spinning disk for bulk capacity, SSDs for hot data or cache — without adding a separate all-flash shelf. Explore compatible NAS storage solutions for pairing options.
• Intel Xeon D-1521 with ECC Memory: The Xeon D-1521 is a data-center-class SoC, not a desktop processor. ECC memory (32 GB shipping, expandable to 128 GB RDIMM or 64 GB UDIMM) corrects single-bit memory errors in flight — critical for iSCSI targets and virtualization hosts where silent data corruption is a failure mode, not just an inconvenience.
• 4x PCIe 3.0 x8 Expansion Slots: Four full-bandwidth PCIe 3.0 x8 slots let you add 40GbE networking, additional 10GbE ports, NVMe expansion cards, or Fibre Channel HBAs as your infrastructure grows. Most NAS appliances give you one slot; four here means this unit can evolve with your network without a forklift upgrade.
• Dual SFP+ 10GbE Ports: Both onboard network ports run at 10 Gbps over SFP+ — not copper 10GBASE-T. That matters in rack environments where DAC cables or fiber runs are already in place and you need deterministic latency without the PHY overhead of 10GBASE-T. For PoE switch planning adjacent to this deployment, see our PoE switch selection.
• QES Operating System + VMware/Citrix Support: QES (QNAP Enterprise Storage OS) requires a minimum of 32 GB RAM to run — which is exactly what this unit ships with. Out of the box it supports VMware vSphere 6.5 and Citrix XenServer, making it a validated iSCSI or NFS datastore target for existing hypervisor clusters without additional licensing gymnastics.
• 40GbE-Ready Architecture: With the PCIe expansion slots and 10GbE base ports, the TES-1885U-D1531-32G-US is explicitly positioned as a 40GbE-ready platform. Add a QNAP QXG-series 40GbE card in one of the PCIe slots when your core switching catches up — the infrastructure cost is an add-in card, not a new appliance.

Integration and Compatibility

The TES-1885U-D1531-32G-US supports iSCSI and IP-SAN protocols alongside standard NAS file services, making it compatible with Windows Server, Linux, and VMware environments that use block-level storage. VMware vSphere 6.5 and Citrix XenServer are explicitly validated by QNAP. The PCIe expansion architecture accommodates third-party network and storage cards. For large surveillance deployments requiring centralized video storage, pair this unit with a network video recorder or VMS server feeding iSCSI LUNs directly to the TES-1885U for long-term retention.

Frequently Asked Questions

Q: How much RAM does the TES-1885U-D1531-32G-US ship with, and what is the maximum?

A: It ships with 32 GB RDIMM DDR4 ECC. Maximum supported is 128 GB via RDIMM (4 x 32 GB) or 64 GB via UDIMM (4 x 16 GB). Note that QES requires a minimum of 32 GB to operate.

Q: What drive types are supported in the 12+6 bays?

A: The 12 primary bays support 3.5-inch SAS and SATA hard drives. The 6 additional bays are dedicated SATA SSD slots for tiered storage or caching configurations.

Q: Does the TES-1885U-D1531-32G-US support VMware or other hypervisors?

A: Yes. QNAP explicitly validates VMware vSphere 6.5 and Citrix XenServer on this platform. It can serve as an iSCSI or NFS datastore target for these hypervisors.

Q: What networking does this unit include out of the box?

A: Two SFP+ 10GbE ports are built in. The four PCIe 3.0 x8 slots allow expansion to 40GbE or additional 10GbE ports via add-in cards.

Q: Can I expand connectivity beyond the two built-in 10GbE ports?

A: Yes. Four PCIe 3.0 x8 expansion slots support QNAP QXG-series and compatible third-party network cards, including 40GbE options, making this platform future-proof for higher-throughput environments.

Eden Phillips

The TES-1885U-D1531-32G-US is one of the few NAS appliances I would actually call a compute platform rather than just a storage box. The Intel Xeon D-1521 running at 2.4 GHz with ECC RAM gives you the memory integrity guarantees that matter when you are running iSCSI LUNs for virtual machines — if you have ever chased a guest OS crash back to a silent memory error on a non-ECC NAS, you understand why the ECC spec here is not a checkbox item but a genuine architectural difference.

Technical Highlights:

• 128 GB Max RDIMM Headroom: Shipping at 32 GB (QES minimum), the system scales to 128 GB RDIMM — enough to run memory-hungry workloads like ZFS ARC caching or in-memory databases alongside the NAS OS without contention.
• 4x PCIe 3.0 x8 Slots: Full x8 bandwidth on all four slots means you are not bottlenecked adding a 40GbE card or an NVMe expansion shelf. Most enterprise NAS platforms give you x4 or x1 slots masked as x8 mechanical — these are the real thing.
• Dual SFP+ 10GbE Base Ports: SFP+ rather than 10GBASE-T keeps latency low and heat down in dense rack rows. DAC cables to a ToR switch cost less than Cat6A runs and eliminate the 10GBASE-T PHY latency penalty.

Deployment Considerations:

• QES requires a minimum of 32 GB RAM — the TES-1885U-D1531-32G-US ships exactly at that floor. If you plan to add VM datastores or heavy iSCSI workloads day one, budget for a RAM upgrade before deployment rather than after.
• The six SATA SSD bays are fixed-function — they do not accept SAS SSDs or NVMe drives. Confirm your SSD inventory is SATA before racking this unit in a tiered storage design.

This unit is the right call for a mid-size enterprise or managed service provider building a converged iSCSI + file services platform that needs to grow from 10GbE to 40GbE without replacing the appliance — the four PCIe slots make that upgrade a card swap, not a capital project.