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Description
Synology FlashStation FX2421 DAS Storage SystemThe Synology FlashStation FX2421 is a high performance DAS expansion unit designed to scale your all flash storage with the FlashStation line. It delivers seamless, on the fly capacity growth by adding 24 hot swappable 2. 5" drive bays, enabling you to expand storage space without interrupting workloads. Built for enterprise SSDs, the FX2421 combines rugged reliability with fast, scalable performance for demanding data center environments. On the Fly
The Synology FlashStation FX2421 is a high-performance DAS expansion unit designed to scale your all-flash storage with the FlashStation line. It delivers seamless, on-the-fly capacity growth by adding 24 hot-swappable 2.5" drive bays, enabling you to expand storage space without interrupting workloads. Built for enterprise SSDs, the FX2421 combines rugged reliability with fast, scalable performance for demanding data-center environments.
- On-the-Fly Capacity Expansion: Add 24 additional 2.5" drive bays to your FlashStation without downtime, enabling non-disruptive growth as data needs evolve.
- Enterprise SSD Ready: Optimized for deployment with enterprise-grade SSDs to deliver high IOPS, low latency, and sustained throughput for mission-critical applications.
- 2U Rackmount DAS Expansion: Compact 2U form factor designed to fit in standard data-center racks and simplify scaling across multiple servers.
- Hot-Swappable Drive Bays: 24 hot-swappable bays enable quick maintenance and upgrades without powering down the system.
- Seamless Integration and Management: Works with Synology DSM to allocate new capacity into existing pools or create new volumes, with monitoring and health analytics.
Technical Details of Synology FlashStation FX2421 DAS Storage System
- Form Factor: 2U rackmount expansion chassis
- Drive Bays: 24 x 2.5" bays for enterprise SSDs
- Drive Compatibility: Supports enterprise SATA/SAS SSDs
- Connectivity: Expansion connection to a compatible FlashStation unit via approved expansion cable
- System Compatibility: Designed to work with Synology FlashStation servers and their storage ecosystem
- Installation Type: Direct expansion unit intended for scalable, on-demand capacity growth
how to install Synology FlashStation FX2421
Follow these steps to add the FX2421 to your FlashStation system with minimal disruption:
- Prepare: Ensure you have the FX2421 expansion unit, the official expansion cable, and compatible enterprise SSDs ready for installation.
- Connect: Attach the FX2421 to your FlashStation using the approved expansion cable and secure the chassis in a standard 19" rack.
- Power and detect: Power on the FX2421 (if required) and allow the FlashStation to detect the new bays automatically; the on-the-fly expansion feature enables non-disruptive growth.
- Configure storage: In the Synology DSM Storage Manager, allocate the new bays to an existing storage pool or create a new pool/volume as needed, then apply any tiering, QoS, or replication settings.
- Verify and monitor: Confirm the new capacity is visible, run health checks on the SSDs, and monitor performance to ensure the expansion meets workload requirements.
Frequently asked questions
- What is the FX2421? The FX2421 is a 2U DAS expansion unit designed to add 24 additional 2.5" drive bays to Synology FlashStation servers, enabling on-the-fly capacity growth with enterprise SSDs.
- How many drives can I add? Up to 24 drives can be added in a single FX2421 expansion unit, expanding your total flash storage capacity significantly.
- What types of drives does it support? It supports enterprise-grade 2.5" SATA/SAS SSDs to deliver high performance and reliability for demanding workloads.
- Is the expansion hot-swappable? Yes. The FX2421 is designed for hot-swappable drive bays, allowing maintenance and upgrades without shutting down the system.
- Do I need downtime to expand storage? No. The FX2421 provides on-the-fly capacity expansion, enabling storage growth while FlashStation workloads continue to run.
- How do I manage the new capacity? Use Synology DSM Storage Manager to allocate new drives to an existing pool/volume or create a new pool/volume and configure performance, replication, and protection policies as needed.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.5 ★★★★★
Based on 10 reviews
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Product Reviews
★★★★★ 1
Fuzzballs get wearing once
Color: Black, Size: X-Large
Very smart to wear, but the quality is terrible so after one wash the collar start fraying and fuzzballs start forming.
Very disappointing.
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Reviewed in the United States on June 2, 2026
★★★★★ 5
Almost the perfect watch
Color: Black/Blue
I have owned three earlier models of these things going back to the days when I actually ran road races. They are brilliant pieces of work. My only complaint of them was that the start/stop/split button(s)--there were two on the older models--were too small. Well, apparently Timex listens and the two small buttons are now combined into one larger one. Probably this was done years ago but I'm only now getting back into road work, so now I get to discover it.
The perfect watch? Almost. I especially like this model as my eyes are not what they used to be and the oversized face makes it easier to read. The downside to this is that it also makes the crystal easier to scratch. That's always been an issue, but I can live with it. No, the real problem with this product is, was, and apparently ever shall be, the band. Now, it could be worse, it could be a resin band (like the old ones) that will crack and break within a couple of years, but no, this is a nylon and velcro wrap style which should be just dandy, but for three glitches: 1. it's too short 2. it's too narrow (gee whiz, Timex designers, it's an oversized watch, why not a matching oversized band?) and 3. it's still resin where it attaches to the actual watch. Now, I imagine it's probably less prone to breakage in how it's implemented, but if you should choose to replace it, I can see no obvious way of removing it short of cutting it off. Really?
But these are minor complaints. I doubt it would be comfortable on anyone whose wrists are much bigger than my own, but replacement bands are everywhere, and this watch will keep time with style and it's brilliant at splits. Heck, it even functions admirably as a backup for my expensive stopwatches at our regular short track stock car events. For my money (and did I mention the price is wonderful?) the Ironman is still the best at what it does, and for what it can do.
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Reviewed in the United States on November 19, 2014
★★★★★ 5
Good hard use watch.
Color: Black/Silver-Tone
Review Calibration: 3 stars means it works as advertised, nothing special during use, and no amazing features. Higher stars mean better-than-expected performance and features. This is 5 stars because it is my favorite work/hard-use watch. I have been wearing one for years, and like all Timex watches, it can take a beating. I have to replace it when the band's ears get so damaged that they won't hold the band on. This has more to do with the plastic's lifespan than with a design issue. I am hard on watches. This watch normally lasts ne 7-10 years between replacements.
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Reviewed in the United States on April 27, 2026
★★★★★ 5
Great watch
Color: Black/Silver-Tone
Great watch, with many features, specially for those that travel in various time zones.
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Reviewed in the United States on May 7, 2026
★★★★★ 4
Typical Ironman quality
Color: Black/Silver-Tone
This is my fourth Timex Ironman watch. I own many watches, and prefer the Ironman for casual wear and sporting activities as well as swimming and snorkeling. I decided to replace an earlier model with this one rather than pay to change the battery.
The Ironman has changed very little over the years since its introduction in the '80s, with the exception of cosmetic improvememnts and a larger display. I selected the "oversize" model as I was looking for a little more heft to this model. This watch fits the bill, not as chunky as my G-Shock. A pleasant surprise was the weight of the watch. This model is lightweight, another advantage over the G. It's larger than the typical Ironman model, but about the same weight. The band lacks the stiffness of some other Timex and Casio models, and is quite comfortable.
Typical Ironman functions are unchanged, and the ability to "hide" various functions makes operation of the watch more efficient. There are three time zones, useful when traveling, as well as the usual chronograph/timer and alarm functions.
I haven't worn the watch in the pool or ocean yet, but if experience is any guide, I expect no problems. I've never had an Ironman leak, whether during water sports or snorkeling.
These are great watches for the money. I prefer 200 meter water resistance for this type of watch, but Timex has yet to build an Ironman 200m that doesn't overwhelm my wrist in weight and size. I'm not a big guy, and they are simply too large for my wrist.
Looking forward to years of service with this watch. Definitely a good timepiece for the price.
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Reviewed in the United States on May 6, 2013
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