Synology RackStation RS1221+ 8-Bay NAS review

Eight native bays in a compact 2U chassis

The RS1221+ is an eight-bay rack NAS aimed at small offices or branch deployments that want central storage and backup services without a conventional deep 2U chassis. Its eight hot-swappable trays accept supported 3.5-inch SATA hard drives or 2.5-inch SATA HDDs and SSDs. Synology lists expansion to twelve total bays with one RX418, but the shelf is separate; the base RS1221+ remains an eight-bay unit. Check drive identifiers against the exact compatibility list, and plan for data drives and rail hardware as separate purchases unless the seller specifies otherwise.

Its distinguishing practical advantage over the RS1221RP+ is depth and weight. With ears, Synology lists 88 × 482 × 306.6 mm and 6.9 kg for this standard version, versus 407.5 mm deep and 8.4 kg for the RP unit. The non-RP product page lists four-post mounting with RKM114 or RKS-02 rails and direct two-post installation. Rails are sold separately. A short chassis may ease placement in a shallow rack, but usable depth, rear cable bends, ventilation and rack load limits still need to be checked at the installation site.

Single power supply, with four 1GbE ports

RS1221+ uses one 250-watt power supply. The RP suffix adds redundant supplies, so choose the standard version only when service continuity through a single supply failure is not a required feature. The distinction matters even if both models use RAID: drive redundancy cannot compensate for a failed power supply. The product package list for the standard model includes one AC cord and one C13-to-C14 cord; that differs from the RP version’s two AC cords. Confirm how the included cords match the intended PDU or outlet and verify the seller’s package.

Four built-in RJ-45 ports are rated at 1GbE each. Synology documents compatible 10GbE and 25GbE adapters as optional PCIe upgrades, not built-in ports. If 2.5GbE or faster is a must, compare the installed card and entire wired network path rather than counting the four gigabit links together. The exact product family is also distinct from the newer RS1226+ family, whose standard model includes 2.5GbE ports; a multigig requirement may justify considering that newer platform, but it is not this model’s built-in feature.

Compute and storage features

The V1500B processor has four cores at 2.2 GHz. The RS1221+ ships with 4 GB of DDR4 ECC SODIMM memory, has two memory slots and a listed 32 GB maximum. Synology cautions that memory compatibility and warranty/support treatment can depend on using its validated modules. The documented storage modes include SHR, RAID 1, RAID 5, RAID 6 and RAID 10, while internal volumes can use Btrfs or ext4. A two-drive RAID 1 arrangement is supported, but it uses two drives to store one mirrored set and remains only one layer of data protection.

Unlike some newer DiskStation models, this chassis does not have integrated M.2 slots. Synology documents SSD cache via compatible SATA SSDs or M.2 NVMe drives installed on a compatible PCIe adapter card. The card and drives are additional components, not included bay capacity. The PCIe slot is also the upgrade path for faster Ethernet, so confirm card compatibility and the intended use before assuming both cache and a faster NIC can be installed in one expansion slot.

Synology’s datasheet lists a 108 TB maximum single volume, but this is a system ceiling under its stated configuration rather than a capacity promise. The supported RAID level, drive sizes, metadata and number of populated bays affect usable space. Synology also publishes a sequential read/write claim above 2,315/1,147 MB/s for the family based on internal testing. This assessment did not test throughput; a gigabit client link, small-file workload or slow switch can be the limiting factor well before a vendor’s sequential benchmark.

When this standard version makes sense

Consider RS1221+ when eight native bays and a short rack depth are more important than redundant power, and one built-in gigabit link is enough for the intended path. Its standard operating plan can combine two compatible SATA drives in a mirror, with the remaining bays available for the chosen configuration, but the exact pool expansion process should be confirmed before staging disks. If power redundancy is a hard requirement, RS1221RP+ is the related choice, with a deeper chassis. If four bays and a 1U rack height are enough, RS826+ is smaller vertically but uses a different RX426 expansion unit and is still gigabit at the ports.

Synology’s U.S. Product Support Status observed October 29, 2026 lists RS1221+ as Generally Available, with Full DSM updates, Full Technical Support and a three-year hardware warranty. This is not a guarantee that a retailer has stock or that a bundle preserves the same terms. Check the complete model suffix, supported drives, exact included cords, rail requirements, available rack depth, any add-in card and the plan for an off-device backup before ordering.

Assessment

The RS1221+ combines eight native SATA positions, ECC memory, Btrfs/RAID choices and a particularly short 2U footprint in a well-defined business NAS platform. Its limitations are just as concrete: one supply, four built-in gigabit ports and no integrated M.2 positions. Optional expansion can extend the system, but it increases the number of compatibility and installation decisions. This is a documentation-based review, not a report of personal ownership or a test result.

Primary references: Synology’s U.S. RS1221RP+ / RS1221+ page, the RS1221+ datasheet, its hardware guide, the launch announcement and Synology’s U.S. Product Support Status.