Eight bays is small-business and serious-archive territory: RAID 6 with six drives of usable capacity, room for hot spares, and per-terabyte economics no smaller chassis matches. Cheapest in stock right now: Synology DiskStation DS1825+ 8-Bay at $1,249.99.
| Brand | Model | Bays | CPU | RAM | Network | Wty | Price | Buy |
|---|---|---|---|---|---|---|---|---|
| Synology | DiskStation DS1825+ 8-Bay DSM 7 | 8 | AMD Ryzen V1500B (4-core) | 8GB DDR4 ECC | 2x 2.5GbE | 3yr | $1,249.99 | Buy → |
| UGREEN | NASync DXP8800 Plus 8-Bay UGOS Pro | 8 | Intel Core i5-1235U (10-core) | 8GB DDR5 | 2x 10GbE | 2yr | $1,369.99 | Buy → |
Eight bays is where a NAS stops being an appliance and starts being infrastructure. The math scales accordingly: eight drives in RAID 6 yield six drives of usable capacity — 120TB with 20TB disks — while tolerating two failures, and the chassis still has room to dedicate a bay to a hot spare that rebuilds automatically the moment a drive drops. This is the size for small businesses consolidating file service, videographers with archives that grow by terabytes per project, and homelab operators who are done buying chassis.
The verified in-stock field at eight bays is currently a two-horse contest with opposite philosophies: UGREEN's DXP8800 Plus stacks a 10-core i5 and dual 10GbE — server-grade throughput for the price of a mid-tier appliance — while Synology's DS1825+ counters with DSM, ECC memory and the deepest backup tooling in the industry. Per-bay pricing favors UGREEN decisively; total-cost-of-ownership for a business without an IT person often favors Synology. Both live prices are below, and at this tier the drives will outcost either enclosure severalfold.
An eight-bay purchase also deserves a moment of honest devil's advocacy: the alternative at this scale is a used enterprise server or a DIY TrueNAS build, both of which undercut appliance pricing per bay. The appliance case rests on power draw, noise, warranty and the absence of a weekend spent assembling — real advantages with real prices, quantified live in the table above. Buyers who relish the DIY path already know who they are; for everyone else, the two verified models below represent the appliance market's current answer.
RAID 6 is not optional at eight large drives — it is the floor. Six drives usable, two-drive tolerance, and ideally a ninth drive on the shelf (or a bay sacrificed to a hot spare) so rebuilds start in minutes rather than shipping days. The arithmetic that surprises first-time buyers: a full eight-bay 20TB build is a five-figure drive purchase at current shortage prices, which makes staged population attractive — start with four or five drives in RAID 6, expand as prices dip, and let our live trackers time the buys.
At this scale, also plan what the array cannot do: RAID protects against drive failure, not against the chassis failing, ransomware encrypting the shares, or the office flooding. A second, smaller box replicating the irreplaceable subset — even a humble 2-bay offsite — completes the design. The upgrade planner's resale math also matters here: eight retired drives from a capacity upgrade carry real resale value in the current market, meaningfully offsetting the next tier of disks.
At this scale, also decide the pool topology deliberately rather than defaulting to one giant volume: two four-drive RAID 6 groups rebuild faster and isolate failures better than one eight-drive group, at the cost of two more parity drives; a single eight-drive RAID 6 maximizes usable space. ZFS-based systems offer RAID-Z2 vdev layouts with the same trade-offs under different names. There is no universally right answer — but there is a wrong way to choose, which is not choosing and living with whatever the setup wizard defaulted.
Cheapest in-stock 8-bay (Synology DiskStation DS1825+ 8-Bay, $1,249.99) plus 8 × MDD 20TB at $309.99 each = $3,729.91 for 120TB usable in RAID 6 — about $31.08 per usable terabyte. Re-run this for any capacity in the NAS Builder.
Model any drive count and RAID level in the RAID planner, and compare drive prices per terabyte on the NAS drive tracker. Upgrading an existing array instead? The upgrade planner nets out the resale value of the drives you retire.
Spec priorities at eight bays: 10GbE is effectively mandatory — an eight-drive RAID 6 array saturates 2.5GbE several times over, and the DXP8800 Plus shipping dual 10GbE standard is exactly the right instinct. ECC memory earns its premium once the box holds business records (the DS1825+ has it). CPU matters less for pure file service than the spec war implies, but containers, indexing and backup jobs at this scale appreciate the headroom. And weigh noise and power as first-class specs: eight spinning drives are audible and draw continuously — this is the tier where the utility bill and the server closet's acoustics enter the decision.
Sequence the purchase deliberately: enclosure and first drive batch together, network upgrades in the same order (the 10GbE switch is part of the build), and the backup target before the array reaches half full — not after. Eight-bay owners consistently report the same retrospective: the hardware decisions were easy, and the operational habits — scrubs, alerts, spares, backups — were what actually determined whether the array was an asset or an anxiety. Buy the discipline with the box.
At eight drives, buy like a small datacenter: identical enterprise-class CMR drives, one purchase batch, plus at least one cold spare — nine drives total for an eight-bay build. Enterprise drives earn their keep here not through speed but through workload ratings and error-rate specifications that describe continuous multi-drive duty honestly; recertified datacenter pulls are the budget path our live rankings frequently favor, and RAID 6 plus a spare is precisely the environment that absorbs their slightly higher risk.
Spread risk where you can: if the order allows, split the eight drives across two orders or conditions (four new, four recertified of the same model family is a defensible pattern) to decorrelate batch defects. Record every serial and SMART baseline on day one, schedule monthly scrubs, and treat the first reallocated sector on any member as a replacement trigger, not a curiosity — at this array size, drive discipline is the difference between RAID 6 being robust and being merely comforting.
Capacity strategy deserves a spreadsheet moment: at today's live prices, the per-terabyte difference between filling eight bays with mid-capacity drives versus six bays with large ones can run to hundreds of dollars, and the builder tool computes both instantly. The large-drive path leaves empty bays — future expansion without migration — which in the current shortage is an option with real monetary value.
The defining 8-bay mistake is scaling the array without scaling the operations: eight drives running 24/7 want scheduled scrubs, SMART alerting to an inbox someone reads, UPS protection sized for a clean shutdown, and a documented what-if-a-drive-fails procedure. An unmonitored eight-drive array is not resilient infrastructure; it is a slow-motion incident with good intentions.
The second mistake is treating the array as the backup because it is large: 120TB of RAID 6 replicates ransomware at 120TB scale. The irreplaceable subset — documents, photos, project files — still needs an independent copy, and its size usually makes that cheap relative to the array. Third: buying eight bays of capacity but 2.5GbE of network, which caps the array at a fraction of its throughput; at this tier 10GbE is part of the build cost, not an accessory. Last: forgetting power and acoustics — eight spindles draw continuously and hum audibly, and the buyers happiest with this size planned the closet before the checkout.
And one procurement note peculiar to this tier: order the drives from a supplier whose packaging you trust, spread deliveries if buying nine at once, and refuse any drive that arrives in inadequate padding. Eight-drive orders concentrate shipping risk the way they concentrate every other risk — one rough pallet can seed an array with pre-damaged members whose failures then arrive correlated, months later, defeating the statistics RAID 6 depends on. It sounds paranoid until the second drive from the same box fails in the same week.
Small businesses centralizing storage, media professionals with archives growing by terabytes per project, and homelab consolidators replacing multiple smaller boxes. If your five-year data projection stays under 40TB, a 6-bay serves you cheaper; the 8-bay's argument is capacity trajectory and hot-spare headroom.
RAID 6 with six usable drives as the baseline, and consider dedicating a bay to a hot spare — automatic rebuilds beat waiting on a shipment. Eight 20TB drives in RAID 6 yield 120TB usable with two-drive tolerance. RAID 5 at this drive count and size is not a responsible configuration.
UGREEN for hardware per dollar — the i5 and dual 10GbE have no rival at the price. Synology for DSM's backup suite, ECC memory and appliance-grade operation where nobody administers the box. The live prices above quantify the premium; the drives you add will dwarf either number.
Yes, and at current drive prices it is often the smart play: begin with four or five drives in RAID 6, then expand the array as prices dip or needs grow. Check the specific OS's expansion behavior — DSM handles staged growth gracefully — and buy expansion drives in matched batches.
The enclosure is the small line item: eight NAS-class 20TB drives dominate the bill at today's shortage prices. Price your exact configuration in the NAS Builder at live prices, and consider staged population — the tool shows how the per-usable-terabyte cost shifts with drive count and capacity.
For most, yes — the 4-bay and 6-bay pages cover home use cases at lower cost and power draw. It stops being overkill when your library genuinely grows past what six bays hold in RAID 6, or when consolidating several old boxes into one chassis simplifies a homelab enough to justify the jump.