Synology FlashStation FS3600 review

The FS3600 is a 2U, 24-bay FlashStation for businesses that need all-flash or mixed SAS/SATA storage in a rack, not a low-noise desktop file server. Its headline “all-flash” positioning describes the intended performance tier, but Synology’s current specification lists 2.5-inch SAS hard drives and SAS SSDs as well as SATA SSDs. That wider drive choice is a meaningful distinction from SATA-SSD-only FlashStations such as the FS3420 and FS3410.

A flexible 24-bay media choice, with a compatibility caveat

Each of the 24 hot-swappable positions accepts a documented 2.5-inch SAS HDD, 2.5-inch SAS SSD, or SATA SSD. The chassis is sold without storage drives in the manufacturer’s package list. A connector or form factor alone does not prove that a particular disk is supported: check the exact drive model against Synology’s FS3600 compatibility information before assembling a capacity plan. Do not treat the model’s all-flash marketing as evidence that a bundle of SSDs is included.

The same hardware can therefore serve different storage approaches, but not every one at once: a SAS spinning-disk arrangement, SAS SSD pool, and SATA SSD pool have different cost and performance tradeoffs. RAID 1 is one documented storage option and can provide a two-drive mirror arrangement. That is a drive-failure safeguard, not an independent backup. Snapshots, replication and a separate backup target address different failure events and require their own capacity and administration plans.

Rack, network and expansion are part of the system cost

Built-in data networking includes two 10GbE ports and four 1GbE ports. The single 10GbE port is a link-rate ceiling for the finder, not a promise of sustained file throughput; server workload, installed drives, switch, cabling and client all matter. Optional supported network cards can change the installed interface mix, but they are not standard built-in ports. The system is 2U and listed for a four-post 19-inch rack. Synology lists its sliding RKS-02 rail kit as a separate purchase, while the manufacturer package list includes two AC power cords and an accessory pack.

Capacity can grow beyond the 24 internal bays through compatible expansion units. Synology lists a 72-drive maximum with two FX2421 units, and its current compatibility table confirms FX2421 for FS3600. The product page also mentions RX1222sas, but that current pairing table does not list FS3600 with RX1222sas; verify the latter with Synology before relying on it. Treat an expansion shelf as a separate rack appliance with its own power, space, cooling and compatible drives, not as extra free internal bays.

Older platform, still a distinct supported model

The specification identifies one 12-core Intel Xeon D-1567 processor, 16 GB of installed DDR4 ECC RDIMM memory and a listed maximum of 128 GB. Synology’s present US support-status page shows FS3600 as generally available with full DSM updates, full technical support and a five-year warranty. This is manufacturer lifecycle information; it is not a promise that a particular seller has stock or a particular package. The 57 dB(A) noise figure is a manufacturer measurement in a specified fully populated idle test with hard drives. It is a useful warning to plan a rack room, not a measurement of every installation.

Synology also advertises more than 195,000 4K random-write iSCSI IOPS for the current product page. That is a company test claim, not an independently reproduced result or an estimate of a buyer’s file-copy speed. The practical question is whether your application, media type, RAID layout and network path can use an enterprise all-flash platform at all.

Who should shortlist the FS3600?

It belongs on a shortlist when a team needs a 24-bay rack NAS, has a deliberate compatible-drive plan, can use built-in 10GbE, and values a choice of supported SAS and SATA SSD media or listed SAS HDDs. It is less compelling for a home user who only needs shared files, wants quiet equipment near a desk, or expects drives and rails to come in a complete ready-to-use bundle.

Compare it with the FS3420 if SATA SSD-only bays are enough and the newer 32 GB memory baseline and PCIe Gen4 slots matter; compare it with the FS3410 if four built-in 1GbE data ports or a different network-card path are relevant. The FS3600’s differentiators are drive-interface flexibility and its documented expansion route, not an assumption that any nearby FlashStation is interchangeable. Confirm exact drives, shelf model, rack depth, noise tolerance and backup destination before choosing an offer.