{"product_id":"qnap-es1686dc-r2","title":"QNAP ES1686dc R2 16-Bay Dual-Controller SAS Rackmount NAS","description":"\u003cdiv id=\"ace-qnap-es1686dc-r2-copy\"\u003e\n\u003cstyle\u003e\n#ace-qnap-es1686dc-r2-copy { font-family: Inter, Arial, sans-serif; color: inherit; }\n\/* Reuses the current ACE calculator FAQ disclosure treatment. Scope: this product FAQ only. *\/\n#ace-qnap-es1686dc-r2-copy .ace-article-faq { --ace-family-ink: #21352b; --ace-family-muted: #5b6961; --ace-family-line: #d3d9d5; --ace-family-soft: #f4f7f4; margin: 24px 0; padding: 0; background: transparent; font-family: Inter, Arial, sans-serif; }\n#ace-qnap-es1686dc-r2-copy .ace-article-faq details.ace-form-disclosure { margin: 0 0 12px; padding: 0; border: 1px solid var(--ace-family-line); border-radius: 12px; background: #fff; overflow: visible; }\n#ace-qnap-es1686dc-r2-copy .ace-article-faq details \u003e summary { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 56px; margin: 0; padding: 16px 20px; border-radius: 12px; background: var(--ace-family-soft); color: var(--ace-family-ink); font: inherit; font-size: 16px; font-weight: 600; line-height: 1.4; list-style: none; cursor: pointer; }\n#ace-qnap-es1686dc-r2-copy .ace-article-faq summary::-webkit-details-marker { display: none; }\n#ace-qnap-es1686dc-r2-copy .ace-article-faq summary::marker { content: ''; }\n#ace-qnap-es1686dc-r2-copy .ace-article-faq summary::before, #ace-qnap-es1686dc-r2-copy .ace-article-faq summary::after { content: none; }\n#ace-qnap-es1686dc-r2-copy .ace-article-faq details[open] \u003e summary { border-radius: 12px 12px 0 0; border-bottom: 0; }\n#ace-qnap-es1686dc-r2-copy .ace-article-faq h3.ace-form-title { display: flex; align-items: center; justify-content: space-between; gap: 16px; width: 100%; min-width: 0; margin: 0 !important; padding: 0; color: var(--ace-family-ink); font-family: Inter, Arial, sans-serif; font-size: 16px; font-weight: 600; line-height: 1.35; letter-spacing: normal; text-transform: none; }\n#ace-qnap-es1686dc-r2-copy .ace-article-faq .ace-form-title-text { display: flex; flex: 1 1 auto; min-width: 0; margin: 0; overflow-wrap: anywhere; }\n#ace-qnap-es1686dc-r2-copy .ace-article-faq .ace-form-toggle { display: inline-flex; align-items: center; gap: 10px; flex: 0 0 auto; margin: 0 0 0 auto; padding: 0; color: #55605a; font-size: 12px; line-height: 1.4; font-weight: 500; white-space: nowrap; }\n#ace-qnap-es1686dc-r2-copy .ace-article-faq details \u003e summary .ace-form-collapse { display: none; }\n#ace-qnap-es1686dc-r2-copy .ace-article-faq details[open] \u003e summary .ace-form-expand { display: none; }\n#ace-qnap-es1686dc-r2-copy .ace-article-faq details[open] \u003e summary .ace-form-collapse { display: inline; }\n#ace-qnap-es1686dc-r2-copy .ace-article-faq .ace-form-chevron { display: inline-block; width: 8px; height: 8px; margin: 0 2px 4px; border-bottom: 2px solid currentColor; border-right: 2px solid currentColor; transform: rotate(45deg); transition: transform .15s ease; }\n#ace-qnap-es1686dc-r2-copy .ace-article-faq details[open] \u003e summary .ace-form-chevron { transform: rotate(225deg); margin-bottom: 0; }\n#ace-qnap-es1686dc-r2-copy .ace-article-faq .ace-form-body { margin: 0; padding: 20px; min-width: 0; color: var(--ace-family-ink); font-size: 15px; line-height: 1.65; }\n#ace-qnap-es1686dc-r2-copy .ace-article-faq .ace-form-body \u003e p { margin: 0; line-height: 1.65; }\n#ace-qnap-es1686dc-r2-copy .ace-article-faq summary:focus-visible { outline: 3px solid #24731a; outline-offset: 3px; }\n@media (max-width: 640px) {\n  #ace-qnap-es1686dc-r2-copy .ace-article-faq details \u003e summary { padding: 14px 16px; gap: 12px; }\n  #ace-qnap-es1686dc-r2-copy .ace-article-faq h3.ace-form-title { gap: 12px; }\n  #ace-qnap-es1686dc-r2-copy .ace-article-faq .ace-form-body { padding: 16px; }\n  #ace-qnap-es1686dc-r2-copy .ace-article-faq .ace-form-toggle { font-size: 11px; gap: 8px; }\n}\n@media (prefers-reduced-motion: reduce) { #ace-qnap-es1686dc-r2-copy .ace-article-faq .ace-form-chevron { transition: none; } }\n\n\n#ace-qnap-es1686dc-r2-copy .ace-article-faq { width:100%; max-width:100%; box-sizing:border-box; }\n#ace-qnap-es1686dc-r2-copy .ace-article-faq .ace-form-body { border:0; box-shadow:none; }\n\n#ace-qnap-es1686dc-r2-copy .ace-article-faq {width:100%;max-width:none;box-sizing:border-box;}\n\u003c\/style\u003e\n\u003ch2\u003eA resilient storage core for essential business services\u003c\/h2\u003e\n\u003cp\u003eWhen applications depend on shared storage, the controller path matters as much as the drives. QNAP ES1686dc R2 combines two active controllers, Intel Xeon processors and QES ZFS storage in a serviceable rack appliance. It is designed for managed file and block storage, with protected write caching and replication tools that can form part of a carefully engineered availability plan. Match the host paths, SAS drives and recovery design before placing production services on the system.\u003c\/p\u003e\n\u003ch2\u003eHighlights\u003c\/h2\u003e\n\u003ch3\u003eAvailability by design\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eTwo active controllers with failover and failback support.\u003c\/li\u003e\n\u003cli\u003eProtected write caching and hot-swappable service components.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eEnterprise storage platform\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eIntel Xeon processing and ECC memory per controller.\u003c\/li\u003e\n\u003cli\u003eSAS drive paths with QES ZFS data services.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eConnected infrastructure\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e10GbE SFP+ connectivity and optional compatible network\/SAN cards.\u003c\/li\u003e\n\u003cli\u003eDual-controller expansion designed around redundant paths.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003ch3\u003eTwo controllers with an engineered host path\u003c\/h3\u003e\n\u003cp\u003eBoth controllers can serve storage workloads, with failover and failback intended to maintain access through selected controller events. The host, switches, network paths and multipath configuration must support the same availability objective. A dual-controller appliance does not turn a single network cable or untested application into an uninterrupted service; validate failover behaviour as part of deployment.\u003c\/p\u003e\n\u003ch3\u003eProtect the write path as well as stored data\u003c\/h3\u003e\n\u003cp\u003eEach controller uses battery-backed write protection and copy-to-flash hardware to protect cached data through supported power-loss events. ZFS adds checksums and supported self-healing to the storage design. Monitor the backup batteries and other service components, maintain suitable external power protection and test recovery procedures. These mechanisms reduce particular risks without guaranteeing that every possible failure will preserve application continuity.\u003c\/p\u003e\n\u003ch3\u003eChoose SAS storage for both controllers\u003c\/h3\u003e\n\u003cp\u003eThe shared bays use SAS drive paths for supported SAS hard drives or SSDs. Select drives with the appropriate dual-port behaviour, sector format, firmware and endurance for the intended pool. Ordinary single-port SATA drives are not a direct equivalent and are not offered here as an unqualified replacement. Expansion likewise needs a supported dual-controller enclosure and redundant SAS cabling.\u003c\/p\u003e\n\u003ch3\u003eQES data services for shared infrastructure\u003c\/h3\u003e\n\u003cp\u003eQES is a FreeBSD-based ZFS storage operating system with file sharing, block storage, snapshots, compression, deduplication and supported replication functions. It is distinct from QTS and QuTS hero. This appliance is designed to present storage to application and virtualisation hosts; it should not be selected on the assumption that ordinary QTS applications, containers or camera-recording software can be installed on it.\u003c\/p\u003e\n\u003ch3\u003eReplicate with a defined recovery objective\u003c\/h3\u003e\n\u003cp\u003eSnapSync and supported backup integration provide routes to another storage system, subject to a compatible target and network design. Select synchronous or scheduled replication around latency, application consistency and the recovery objective. Keep protected backup copies as well: a replicated deletion or compromised administrator account may affect more than the primary appliance.\u003c\/p\u003e\n\u003ch3\u003eService the installation with fewer surprises\u003c\/h3\u003e\n\u003cp\u003eThe factory package includes RAIL-E02, so a second rail kit is not normally required for the appliance. Verify rack mounting depth, cooling, power circuits and service access before installation. Hot-swappable controllers, power and fan modules support maintenance planning, while documented monitoring and component-replacement procedures remain essential to operating the system responsibly.\u003c\/p\u003e\n\u003ch2\u003eSummary\u003c\/h2\u003e\n\u003cp\u003eES1686dc R2 is suited to organisations building a managed, resilient storage service around compatible SAS drives and properly configured host paths. Its dual-controller architecture and QES data services provide the building blocks; the result depends on the complete network, host, monitoring and recovery design. Plan and test that design before relying on it for essential workloads.\u003c\/p\u003e\n\u003csection class=\"ace-article-faq\" aria-label=\"Frequently asked questions\"\u003e\u003cdetails class=\"ace-form-disclosure\" name=\"ace-qnap-es1686dc-r2-copy-faq\"\u003e\u003csummary\u003e\u003ch3 class=\"ace-form-title\"\u003e\n\u003cspan class=\"ace-form-title-text\"\u003eIs the memory shown a total for both controllers?\u003c\/span\u003e\u003cspan class=\"ace-form-toggle\" aria-hidden=\"true\"\u003e\u003cspan class=\"ace-form-expand\"\u003eExpand\u003c\/span\u003e\u003cspan class=\"ace-form-collapse\"\u003eCollapse\u003c\/span\u003e\u003cspan class=\"ace-form-chevron\"\u003e\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/h3\u003e\u003c\/summary\u003e\u003cdiv class=\"ace-form-body\"\u003e\u003cp\u003eYes. The Configuration selector shows total system memory. The corresponding per-controller memory is half that total, and each controller has its own processor and memory. Use matching supported memory configurations and do not mix registered and load-reduced DIMM types.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\u003cdetails class=\"ace-form-disclosure\" name=\"ace-qnap-es1686dc-r2-copy-faq\"\u003e\u003csummary\u003e\u003ch3 class=\"ace-form-title\"\u003e\n\u003cspan class=\"ace-form-title-text\"\u003eCan I use ordinary SATA hard drives?\u003c\/span\u003e\u003cspan class=\"ace-form-toggle\" aria-hidden=\"true\"\u003e\u003cspan class=\"ace-form-expand\"\u003eExpand\u003c\/span\u003e\u003cspan class=\"ace-form-collapse\"\u003eCollapse\u003c\/span\u003e\u003cspan class=\"ace-form-chevron\"\u003e\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/h3\u003e\u003c\/summary\u003e\u003cdiv class=\"ace-form-body\"\u003e\u003cp\u003eThe supported shared-drive path is SAS. Do not assume an ordinary SATA drive can provide the required access from both controllers. Use an exact qualified SAS drive, sector format and firmware; any adapter-based proposal needs separate verification.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\u003cdetails class=\"ace-form-disclosure\" name=\"ace-qnap-es1686dc-r2-copy-faq\"\u003e\u003csummary\u003e\u003ch3 class=\"ace-form-title\"\u003e\n\u003cspan class=\"ace-form-title-text\"\u003eDoes it run QTS apps or record IP cameras?\u003c\/span\u003e\u003cspan class=\"ace-form-toggle\" aria-hidden=\"true\"\u003e\u003cspan class=\"ace-form-expand\"\u003eExpand\u003c\/span\u003e\u003cspan class=\"ace-form-collapse\"\u003eCollapse\u003c\/span\u003e\u003cspan class=\"ace-form-chevron\"\u003e\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/h3\u003e\u003c\/summary\u003e\u003cdiv class=\"ace-form-body\"\u003e\u003cp\u003eNo QTS, QuTS hero or QVR entitlement is promised. ES1686dc R2 runs QES for enterprise file and block storage. Use a supported application or recording host with the NAS providing appropriate storage where the design has been validated.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\u003cdetails class=\"ace-form-disclosure\" name=\"ace-qnap-es1686dc-r2-copy-faq\"\u003e\u003csummary\u003e\u003ch3 class=\"ace-form-title\"\u003e\n\u003cspan class=\"ace-form-title-text\"\u003eWhich expansion unit can I use?\u003c\/span\u003e\u003cspan class=\"ace-form-toggle\" aria-hidden=\"true\"\u003e\u003cspan class=\"ace-form-expand\"\u003eExpand\u003c\/span\u003e\u003cspan class=\"ace-form-collapse\"\u003eCollapse\u003c\/span\u003e\u003cspan class=\"ace-form-chevron\"\u003e\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/h3\u003e\u003c\/summary\u003e\u003cdiv class=\"ace-form-body\"\u003e\u003cp\u003eThe verified route is up to seven TL-R1620Sdc dual-controller SAS enclosures, with the correct SAS adapters and redundant cabling. USB and ordinary single-controller expansion enclosures are not substitutes.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\u003cdetails class=\"ace-form-disclosure\" name=\"ace-qnap-es1686dc-r2-copy-faq\"\u003e\u003csummary\u003e\u003ch3 class=\"ace-form-title\"\u003e\n\u003cspan class=\"ace-form-title-text\"\u003eDo I need to buy a rail kit?\u003c\/span\u003e\u003cspan class=\"ace-form-toggle\" aria-hidden=\"true\"\u003e\u003cspan class=\"ace-form-expand\"\u003eExpand\u003c\/span\u003e\u003cspan class=\"ace-form-collapse\"\u003eCollapse\u003c\/span\u003e\u003cspan class=\"ace-form-chevron\"\u003e\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/h3\u003e\u003c\/summary\u003e\u003cdiv class=\"ace-form-body\"\u003e\u003cp\u003eRAIL-E02 is included in the factory package. Confirm rack depth and mounting suitability before installation; a second appliance rail kit is not normally needed.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\u003cdetails class=\"ace-form-disclosure\" name=\"ace-qnap-es1686dc-r2-copy-faq\"\u003e\u003csummary\u003e\u003ch3 class=\"ace-form-title\"\u003e\n\u003cspan class=\"ace-form-title-text\"\u003eDoes dual-controller mean no downtime?\u003c\/span\u003e\u003cspan class=\"ace-form-toggle\" aria-hidden=\"true\"\u003e\u003cspan class=\"ace-form-expand\"\u003eExpand\u003c\/span\u003e\u003cspan class=\"ace-form-collapse\"\u003eCollapse\u003c\/span\u003e\u003cspan class=\"ace-form-chevron\"\u003e\u003c\/span\u003e\u003c\/span\u003e\n\u003c\/h3\u003e\u003c\/summary\u003e\u003cdiv class=\"ace-form-body\"\u003e\u003cp\u003eIt supports failover and failback for an engineered high-availability design. Results depend on host multipath, network paths, software configuration and the fault involved. Test the intended failure scenarios and maintain independent backups.\u003c\/p\u003e\u003c\/div\u003e\u003c\/details\u003e\n\u003c\/section\u003e\n\u003c\/div\u003e","brand":"QNAP","offers":[{"title":"Xeon 4-Core 64GB Total","offer_id":41582574174267,"sku":"ES1686dc-R2-2123IT-64G","price":21949.92,"currency_code":"SGD","in_stock":true},{"title":"Xeon 8-Core 96GB Total","offer_id":41582574207035,"sku":"ES1686dc-R2-2142IT-96G","price":28096.38,"currency_code":"SGD","in_stock":true},{"title":"Xeon 8-Core 128GB Total","offer_id":41582574239803,"sku":"ES1686dc-R2-2142IT-128G","price":33364.78,"currency_code":"SGD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0557\/4541\/3179\/products\/qnap-es1686dc-16-bay-dual-controller-sassata-rackmount-nas-576267.png?v=1703212138","url":"https:\/\/aceperipherals.com\/products\/qnap-es1686dc-r2","provider":"ACE Peripherals","version":"1.0","type":"link"}