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

QNAP TES-1885U-D1531-32GR-US 18-Bay 10GbE Enterprise NAS and iSCSI Storage Server

The QNAP TES-1885U-D1531-32GR-US is a 2U rackmount NAS and iSCSI storage platform built around an Intel Xeon D-1521 4-core processor — the kind of compute foundation that separates enterprise shared storage from prosumer boxes. With 12 large-format drive bays plus 6 SSD bays, dual 10GbE SFP+ ports, and four PCIe 3.0 x8 expansion slots, this unit is sized for organizations running multi-server virtualization, high-throughput surveillance archiving, or shared block storage across a 10GbE fabric. It ships with 32 GB of RDIMM DDR4 ECC RAM installed, though QES — QNAP's enterprise storage operating system — requires at least 32 GB to run, so you're right at the minimum out of the box with room to scale to 128 GB RDIMM if your workload demands it.

Key Features

• Intel Xeon D-1521 Processor (2.4 GHz, 4-core, up to 2.7 GHz turbo): A server-class CPU, not a desktop or embedded chip. The Xeon D-1521 handles concurrent iSCSI targets, NFS/SMB shares, and background RAID rebuilds without the throughput collapse you'd see on a Celeron-class NAS under load. The 2.7 GHz turbo matters for single-threaded storage protocol overhead.
• 32 GB RDIMM DDR4 ECC RAM (expandable to 128 GB RDIMM or 64 GB UDIMM): ECC memory prevents silent data corruption — a non-negotiable for any storage system holding production data. Starting at 32 GB satisfies the QES minimum requirement, but plan for 64 GB or more if you're running multiple VMs or heavy iSCSI workloads concurrently. RDIMM support to 128 GB gives a long upgrade runway without a platform change.
• 18-Bay Hybrid Drive Configuration (12 SAS/SATA HDDs + 6 SATA SSD bays): The 6 dedicated SSD bays aren't just cache — they're first-class storage bays, useful for tiering hot data, housing separate pools for high-IOPS workloads, or building a hybrid RAID that keeps latency-sensitive volumes on flash while bulk data lives on spinning media. On a surveillance deployment, that means index and metadata on SSD while raw video streams to HDD pools.
• Dual 10GbE SFP+ Ports: Two 10GbE uplinks let you bond connections for 20Gbps aggregate throughput to your core switch, or segment traffic — one port for replication, one for client access — without buying a separate NIC. On a network switch infrastructure running 10GbE to servers, this unit can sustain the full wire speed without becoming the bottleneck.
• 4x PCIe 3.0 x8 Expansion Slots: Four full-bandwidth PCIe slots is unusually generous for a 2U NAS. Deploy a 40GbE NIC for high-density video ingest, add an SAS HBA for external JBOD expansion, or install an NVMe expansion card for ultra-low-latency tiering — all simultaneously. This is the expansion headroom that makes the TES-1885U-D1531-32GR-US a platform rather than a fixed appliance.
• QES Operating System with VMware vSphere 6.5 and Citrix XenServer Support: QES is QNAP's ZFS-based enterprise OS — it handles thin provisioning, snapshots, and block-level iSCSI in a way the consumer-grade QTS line simply doesn't. Certified compatibility with VMware vSphere 6.5 and Citrix XenServer means it integrates into existing virtualization environments as a datastore, not just a file share. For shops running a VMware cluster, this matters: you can present iSCSI LUNs directly to ESXi hosts.
• SAS/SATA Drive Support: SAS drive support opens access to enterprise-grade HDDs and SSDs with dual-port redundancy and higher rated MTBF than SATA equivalents. If you're building a pool that runs 24/7 under sustained write load — continuous surveillance recording, for instance — SAS drives carry meaningfully better endurance specs than consumer SATA.

Integration and Compatibility

The TES-1885U-D1531-32GR-US runs QNAP's QES platform and supports VMware vSphere 6.5 and Citrix XenServer, making it a viable shared datastore for existing hypervisor clusters. The four PCIe 3.0 x8 slots allow addition of 40GbE networking to future-proof against bandwidth requirements as camera counts or server counts grow. The unit is compatible with QNAP's broader QNAP NAS and storage lineup, including JBOD expansion enclosures if raw capacity needs to scale beyond the 18 on-board bays. For surveillance-specific deployments, the QES platform supports integration with network video recorders and VMS platforms that write to iSCSI or NFS targets. For planning storage capacity across multiple cameras and retention windows, reference a storage retention planning guide to size your drive pools correctly before committing to a RAID configuration. The dual SFP+ 10GbE ports pair well with a 10GbE core switch for full wire-speed throughput to attached servers.

Frequently Asked Questions

Q: What is the minimum RAM required to run QES on the TES-1885U-D1531-32GR-US?

A: QES requires at least 32 GB of RAM. The TES-1885U-D1531-32GR-US ships with 32 GB RDIMM DDR4 ECC installed, which meets the minimum. You can expand to 128 GB using RDIMM modules (4 slots, up to 4x 32 GB) or up to 64 GB with UDIMM modules.

Q: Does the TES-1885U-D1531-32GR-US support VMware vSphere?

A: Yes. The TES-1885U-D1531-32GR-US is compatible with VMware vSphere 6.5 and Citrix XenServer, allowing it to serve as an iSCSI or NFS datastore for virtualization clusters.

Q: How many PCIe expansion slots does the TES-1885U-D1531-32GR-US have, and what type?

A: The unit provides 4 PCIe 3.0 x8 expansion slots. These can be used for 40GbE NICs, SAS HBAs, NVMe expansion cards, or other compatible PCIe peripherals.

Q: What drive types does the TES-1885U-D1531-32GR-US accept?

A: The 12 large-format bays support 3.5-inch SAS and SATA hard drives. The 6 additional bays are dedicated SATA SSD bays. SAS drive support enables enterprise-class redundancy and endurance for always-on workloads.

Q: What networking does the TES-1885U-D1531-32GR-US include out of the box?

A: The unit includes 2 built-in SFP+ 10GbE ports. Additional 25GbE, 40GbE, or other network interfaces can be added via the 4 PCIe 3.0 x8 expansion slots.

Q: Can the TES-1885U-D1531-32GR-US be expanded with additional drive enclosures?

A: Yes. A SAS HBA installed in one of the four PCIe slots allows connection to compatible QNAP JBOD expansion enclosures, extending raw capacity beyond the 18 on-board bays.

Ted Perry

The TES-1885U-D1531-32GR-US is one of the few 2U NAS platforms where the four PCIe 3.0 x8 slots are genuinely full-bandwidth — not shared lanes, not x4 slots mislabeled as x8. That matters when you're stacking a 40GbE NIC alongside a SAS HBA and an NVMe expansion card simultaneously, which is exactly the configuration you'd want in a dense surveillance or virtualization storage cluster pushing sustained writes across 18 bays.

Technical Highlights:

• Xeon D-1521 @ 2.4 GHz (4-core, 2.7 GHz turbo): Server-class CPU handles simultaneous iSCSI block I/O, SMB/NFS file serving, and background RAID operations without throughput collapse — a clear step above the embedded ARM or Celeron chips common in prosumer NAS enclosures.
• 128 GB RDIMM ECC ceiling: Starting at 32 GB (the QES minimum) and scaling to 128 GB RDIMM across four slots, the platform can grow with VM count or cache demands without a box swap. ECC protects in-flight data from silent bit errors — critical on a storage node serving multiple hosts.
• Dual 10GbE SFP+ + 4x PCIe 3.0 x8: Two native 10GbE ports handle current-generation switch fabric, while the PCIe slots allow a future jump to 40GbE when the network infrastructure catches up — no platform replacement required, just a NIC swap.

Deployment Considerations:

• QES requires a minimum of 32 GB RAM to boot — the unit ships right at that floor. If you're provisioning multiple iSCSI LUNs for ESXi or running any QNAP containerized workloads, budget for a RAM upgrade before deployment rather than after performance problems surface.
• VMware vSphere compatibility is confirmed at version 6.5; verify your specific ESXi build against QNAP's HCL before presenting LUNs to production hosts — hypervisor minor-version differences have caused datastore mount failures on QES-based units in mixed-version clusters.

The TES-1885U-D1531-32GR-US is the right fit for a mid-size enterprise building a centralized storage node that needs to serve both a VMware cluster and a high-channel-count surveillance VMS from the same chassis — the SAS/SATA hybrid bay layout and PCIe expansion headroom make it a platform you can tune for that split workload without compromise.