Synology FlashStation FS3017

Synology gets flashy with its new enterprise storage appliance

IT Pro Verdict

Initial investment for this all-flash array is comparatively high but cash can be clawed back by using cheaper SATA SSDs and the FS3017 won’t be beaten for NAS and IP SAN features


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    Super-fast NAS performance, Supports low-cost SATA SSDs; Great data protection features; Dual 10GbE ports


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    High initial outlay; Expensive SAS expansion card

All-flash storage is the way to go if you want the best performance but although costs are dropping, many appliances still come with a hefty price premium. Synology aims to rock the boat with its FlashStation FS3017 which is designed to offer SMBs a powerful all-flash NAS/IP SAN storage solution at an affordable price.

This compact 2U chassis has 24 hot-swap SFF bays and offers plenty of choices as it supports high-performance SAS3 and lower-cost SATA III SSDs. It packs a big hardware package as it's endowed with dual 2.4GHz E5-2620 v3 Xeons and 64GB of ECC DDR4 which can be boosted massively to 512GB.

Network connections are handled by dual embedded 10GBase-T ports and there are two spare PCI-Express slots for adding more. Two USB 3 ports are available for adding external storage devices and the price includes dual 800W hot-plug PSUs.

You can expand outside the box as the FS3017 supports two 12-bay RX1217sas or 24-bay RX2417sas disk shelves. The only drawback is you'll need Synology's dedicated FXC17 SAS3 expansion card which costs an unpleasantly steep 700.

Synology's new RAID F1 array option ensures your SSDs don't all fail at the same time

A new type of RAID

The FS3017 is well built with four sturdy hot-plug fans located under a separate panel in the upper surface. The main lid is easily removed for upgrade and maintenance manoeuvres although the storage HBA arrangement does take up a lot of space.

Synology has fitted three Avago SAS 9300-8i SAS3 HBAs and cabled each of their pairs of 4-port connectors to the drive backplane. We queried this with Synology and it advised us it took this route to avoid any potential performance bottlenecks resulting from using a single SAS3 HBA and SAS expander.

One feature that makes the FS3017 stand out is Synology's new RAID F1 array. SSDs have limited endurance based on the number of program/erase (P/E) cycles and RAID F1 is designed to avoid multiple, simultaneous SSD failures.

It's quite simple as it requires one SSD in an array to be nominated for sacrifice. More parity blocks are written to this SSD so it'll reach the end of its lifespan before the other array members and when you add a replacement drive, the array takes the next oldest for this role during the rebuild.

From Storage Manager you can keep a close eye on SSD status and longevity

All-flash performance

For performance testing, we installed eight Kingston DC400 480GB SATA SSDs and created a single RAID F1 array. With a NAS share mapped to a Lenovo x3550 M5 server running Windows Server 2012 R2, Iometer reported very fast sequential read and write speeds of 9.21Gbps and 9.14Gbps.

Setting Iometer to 4KB blocks returned I/O throughputs for sequential reads and writes of 130,000 IOPS and 91,600 IOPS. Random reads and writes saw only small drops to 124,000 IOPS and 87,000 IOPS.

Mapping another share to a second server over a dedicated 10GbE link saw cumulative sequential read and write speeds ramp up to 18.4Gbps and 18.3Gbps. Cumulative throughput was equally impressive with Iometer recording 220,000 IOPS and 174,000 IOPS for random reads and writes.

IP SAN performance wasn't quite as good with one server logged on to a 500GB file-based target mustering sequential read and write speeds of 9.23Gbps and 8.8Gbps. A dual 10GbE MPIO link to our Lenovo server saw speeds increase to 14.9Gbps and 10.8Gbps.

IP SAN throughput was reasonable with the MPIO link delivering sequential read and write rates of 173,000 IOPS and 154,000 IOPS. Only a small drop was recorded for random operations with Iometer returning 170,000 IOPS and 150,000 IOPS.

NAS and IP SAN snapshots and replication are included as standard features

DSM data protection

Synology's DSM software makes the FS3017 highly versatile allowing it to offer a fine range of NAS and IP SAN features. Choosing BTRFS for your volumes brings in NAS share and iSCSI LUN snapshots and replication.

The Snapshot Replication app manages these and allowed us to run snapshots on demand and schedule them at regular intervals. Snapshots can be replicated to BTRFS volumes on remote Synology appliances and the latest DSM 6.1 allows these to be sent to local volumes as well to provide extra on-site copies for quick restores.

Backup features don't get any better as the slick Hyper Backup app manages everything for you. It's easy to configure and provides wizards for 19 different tasks including backups to cloud providers such as Amazon, Microsoft Azure and Dropbox.

IP SAN LUN snapshots can only be replicated to remote destinations but these can now be managed using the Snapshot Replication app or VMware vCenter Site Recovery Manager. Active Backup is another handy app as it allowed us to secure data on Windows and Linux workstations without having to load an agent on them.

DSM provides everything you need to create a personal cloud storage service


As a pure IP SAN appliance, the FS3017 is up against some stiff competition that deliver all-flash solutions at more competitive prices. HPE's Modular Storage Array 2042 for example, offers dual redundant controllers plus automated data tiering with prices for the 24-bay SFF model starting at around 7,000.

However, support for lower-cost SATA SSDs makes the FS3017 an appealing choice for SMBs on a tight budget. The appliance teams up a powerful hardware specification with good performance and Synology's DSM software offers an impressive range of NAS and IP SAN storage features.


Initial investment for this all-flash array is comparatively high but cash can be clawed back by using cheaper SATA SSDs and the FS3017 won’t be beaten for NAS and IP SAN features

Chassis: 2U rack

CPU: 2 x 2.4GHz E5-2620 v3 Xeons

Memory: 64GB ECC RDIMM DDR4 (max 512GB)

Storage: 24 x SAS 3/SATA III hot-swap drive bays

Controller: 3 x Avago SAS 9300-8i

Array support: RAID0, 1, 10, 5, 6, hot-spare, JBOD

Network: 2 x 10GBase-T

Other ports: 2 x USB 3

Expansion: 2 x PCI-e 3 slots

Power: 2 x 800W hot-plug PSUs

Management: Web browser

Warranty: 5-year limited

Dave Mitchell

Dave is an IT consultant and freelance journalist specialising in hands-on reviews of computer networking products covering all market sectors from small businesses to enterprises. Founder of Binary Testing Ltd – the UK’s premier independent network testing laboratory - Dave has over 45 years of experience in the IT industry.

Dave has produced many thousands of in-depth business networking product reviews from his lab which have been reproduced globally. Writing for ITPro and its sister title, PC Pro, he covers all areas of business IT infrastructure, including servers, storage, network security, data protection, cloud, infrastructure and services.