by StorageReview Enterprise Lab

Synology DS1819+ Review

Synology expanded their already-extensive portfolio back in November, 2018 with the 8-bay tower NAS, DS1819+. The DiskStation DS1819+, successor to the DS1817+, comes equipped with a Quad Core 2.1GHz CPU with an AES-NI hardware encryption engine, and 4GB DDR4 RAM with expansion capabilities up to 32GB. For businesses demanding a NAS with a large data storage capacity, the DS1819+ provides a maximum internal raw storage capacity of 112TB with expansion capabilities of up to 252TB when using two DX517 expansion units.

As with its 17+ counterpart, the DS1819+ features a PCIe Gen3 x8, giving users the possibility of increased performance by installing the optional M.2 SSD adapter card (M2D18), and a 10GbE add-on card for increased data transfers. The DS1819+ also features four built-in gigabit ethernet ports that support link aggregation and failover support.

The DS1819+ is managed by Synology’s OS, DiskStation Manager (DSM), using its most current version, DSM 6.2. DSM takes the complexities of using a NAS and simplifies it. Not only is DSM one of the most user friendly NAS OS out there (and a bonus buying any Synology product), DSM also allows users to leverage powerful tools that range from home use to enterprise. Particularly for the DS1819+ the focus is on backup where Synology offers several packages (Synology’s term for applications). The DS1819+ offers to packages focused on security as well as AES 256-bit encryption, 2-step verification, and a trust level that protects the NAS from third party packages that may have a security issue. All NAS with DSM are also fully certified storage virtualization solutions that work with VMware, Windows Server 2016, Citrix, and OpenStack Cinder.

Synology DS1819+ Specifications

CPU
CPU Model Intel Atom C3538
CPU Architecture 64-bit
CPU Frequency Quad Core 2.1 GHz
Memory
System Memory 4GB DDR4
Memory Module Pre-installed 4GB (1 x 4GB)
Total Memory Slots 2
Memory Expandable up to 32GB (16GB x 2)
Storage
Drive Bays 8
Maximum Drive Bays with Expansion Unit 18
Compatible Drive Type 3.5” SATA HDD
2.5” SATA HDD
2.5” SATA SSD
Maximum Internal Raw Capacity 112TB (14TB drive x 8) (Capacity may vary by RAID types)
Maximum Raw Capacity with Expansion Units 252TB (112TB + 14TB drive x 10) (Capacity may vary by RAID types)
Maximum Single Volume Size 108TB
Hot Swappable Drive Yes
External Ports RJ-45 1 GbE LAN Port: 4 (with Link Aggregation / Failover support)
USB 3.0 Port: 4
eSATA Port: 2
PCIe
PCIe Expansion 1 x Gen3 x8 slot (black, x4 link)
Add-in-card support M2D18 – Dual M.2 SATA/NVMe SSD adapter card for SSD cache
PCIe Network Interface Card
File System
Internal Drives Btrfs
EXT4
External Drives Btrfs
EXT4
EXT3
FAT
NTFS
HFS+
exFAT (purchased separately)
System Fan (mm) 120 x 120 x 2 pcs
Noise Level 22.2 dB(A)
Power
Power Supply Unit / Adapter 250W
AC Input Power Voltage 100V to 240V AC
Power Frequency 50/60 Hz, Single Phase
Power Consumption 66.96 W (Access)
29.39 W (HDD Hibernation)
Environment Temperature
Operating Temperature 0°C to 40°C (32°F to 104°F)
Storage Temperature -20°C to 60°C (-5°F to 140°F)
Relative Humidity 5% to 95% RH
Warranty 3 year Hardware Warranty

 

 

Design and Build

The DiskStation DS1819+, not unlike most Synology tower NAS, sports a matte black metal enclosure. Looking at the front of the NAS, you’ll find 8 vertical drive bays, each with its own drive lock and status indicator. Each drive tray can be removed by pressing the lower portion of the tray and simply pulling it out. Above the drive bays is the power button, which is centered between the Status, Alert, and LAN indicators. On the top-left and bottom-right, you’ll find the company and product branding, respectively. Finally, below the product branding on the bottom-right resides a USB 3.0 port for quickly connecting external drives for backup or loading files quickly.

Looking at the back of the DS1819+, we see Synology took advantage of the large amount of available real estate by including dual 120mm x 120mm fans. To the left of the system fans are the power port and Kensington Security Slot. Below the fans are the four 1 GbE RJ-45 LAN ports, three USB 3.0 ports, and one eSATA port on each side. On the right-hand side is the PCIe expansion slot populated with a dual-port 10GbE NIC.

On either side of the DS1819+ is the Synology logo, which also acts as a small ventilation system for additional airflow.

DSM 6.2 Software Overview

Last year, StorageReview did an in-depth review of Synology DiskStation Manger. As stated above, DSM in incredibly easy to use and intuitive for nearly everyone, that is not something seen from many NAS vendors GUIs. In the previous review we went over the main packages for office and home use. However there are a few specific packages that would be better for use with the DS1819+. 

As far as the overall look and feel, DSM 6.2 doesn’t look much different than the version we reviewed. Users are still greeted with the main screen that has their widgets on the right for things like Storage, System Health, Resource Monitoring, and others of their choosing. The rest of the screen can be populated by whichever packages are most used or users can click on the main menu in the upper left to pull down a list of all the packages installed. 

In Package Center users can easily sort through the packages they need to run their business. All packages are listed in alphabetical order or there are drop down screens to quickly find what one is searching for. Synology also has several third party apps in their Package Center that the trust level protects from maliciously attacking the NAS.

For some of the features a little more specific to a larger NAS such as the DS1819+ would be more inclined to use. Data needs to be kept secure. The NAS comes with AES 256-bit encryption as well as two-step verification. A further step is Synology’s Security Advisor. As the name implies, this package scans the system, the account, and the network looking for potential issues. It also lets users know if an update is available. Users can gather results over time or use analytics to see how threats affect their system. 

Keeping those that want to steal your data out of it isn’t the only security users need. Something can go wrong with any system or the location it resides in, in the case of a natural disaster. Data needs to be backed up but there is usually multiple places where data can reside. Active Backup for Business gives users a quick and easy way to protect various devices: PC, Physical Server, VMs, and file servers. Users can select the devise they want backed up, schedule the backup on a nifty calendar, restore when needed, and view various activities of the Package. 

Another method of backing up the NAS is leveraging Hyper Backup. This package enables users to backup their Synology NAS to various targets. These backups can be scheduled and can be done in multi-versions. The data being backed up can be deduplication and encrypted to save capacity and add another level of security. 

Application Performance Analysis

SQL Server Performance

Each SQL Server VM is configured with two vDisks: 100GB volume for boot and a 500GB volume for the database and log files. From a system resource perspective, we configured each VM with 16 vCPUs, 64GB of DRAM and leveraged the LSI Logic SAS SCSI controller. While our Sysbench workloads tested previously saturated the platform in both storage I/O and capacity, the SQL test is looking for latency performance.

This test uses SQL Server 2014 running on Windows Server 2012 R2 guest VMs, being stressed by Dell's Benchmark Factory for Databases. While our traditional usage of this benchmark has been to test large 3,000-scale databases on local or shared storage, in this iteration we focus on running out four 1,500-scale databases on the NAS over iSCSI.

SQL Server Testing Configuration (per VM)

  • Windows Server 2012 R2
  • Storage Footprint: 600GB allocated, 500GB used
  • SQL Server 2014
    • Database Size: 1,500 scale
    • Virtual Client Load: 15,000
    • RAM Buffer: 48GB
  • Test Length: 3 hours
    • 2.5 hours preconditioning
    • 30 minutes sample period

SQL Server OLTP Benchmark Factory LoadGen Equipment

  • Dell PowerEdge R730 Virtualized SQL 4-node Cluster
    • Eight Intel E5-2690 v3 CPUs for 249GHz in cluster (Two per node, 2.6GHz, 12-cores, 30MB Cache)
    • 1TB RAM (256GB per node, 16GB x 16 DDR4, 128GB per CPU)
    • SD Card Boot (Lexar 16GB)
    • 4 x Mellanox ConnectX-3 InfiniBand Adapter (vSwitch for vMotion and VM network)
    • 4 x Emulex 16GB dual-port FC HBA
    • 4 x Emulex 10GbE dual-port NIC
    • VMware ESXi vSphere 6.0 / Enterprise Plus 8-CPU

When looking at SQL Server Output, we tested two SQL VMs each with a 15,000 VU load applied. This gave us individual TPS scores ranging from 3,307.8 to 3,044.9 (RAID6), while aggregate score came in at 6,082.8 TPS.

Next, we looked at average latency of the DS1819+ where VMs ranged from 195ms to 183ms (RAID6) while aggregate performance showed 189ms, improving over the previous-generation DS1817+.

Sysbench Performance

Each Sysbench VM is configured with three vDisks, one for boot (~92GB), one with the pre-built database (~447GB) and the third for the database under test (270GB). From a system resource perspective, we configured each VM with 16 vCPUs, 60GB of DRAM and leveraged the LSI Logic SAS SCSI controller. Load gen systems are Dell R730 servers; we use four in this review.

Dell PowerEdge R730 Virtualized MySQL 4-8 node Cluster

  • Eight Intel E5-2690 v3 CPUs for 249GHz in cluster (Two per node, 2.6GHz, 12-cores, 30MB Cache) 
  • 1TB RAM (256GB per node, 16GB x 16 DDR4, 128GB per CPU)
  • SD Card Boot (Lexar 16GB)
  • 4 x Emulex 16GB dual-port FC HBA
  • 4 x Emulex 10GbE dual-port NIC
  • VMware ESXi vSphere 6.0 / Enterprise Plus 8-CPU

Sysbench Testing Configuration (per VM)

  • CentOS 6.3 64-bit
  • Storage Footprint: 1TB, 800GB used
  • Percona XtraDB 5.5.30-rel30.1
    • Database Tables: 100
    • Database Size: 10,000,000
    • Database Threads: 32
    • RAM Buffer: 24GB
  • Test Length: 3 hours
    • 2 hours preconditioning 32 threads
    • 1 hour 32 threads

During our sysbench tests, we looked at the DS1819+ configured in RAID6 using 4 VMs only. In aggregate transactional performance, the DiskStation DS1819+ posted a score of 1,166 TPS, showing improved results over the DS 1817+ which showed only 753 TPS.

Average latency of the DS1819+ showed 109.71 across 4 VMs.

During our 4VMs MySQL test, the DS1819+ reached a 99thPercentile average latency of 262.69ms.

Enterprise Synthetic Workload Analysis

Our enterprise hard-drive benchmark process preconditions each drive into steady-state with the same workload the device will be tested with under a heavy load of 16 threads with an outstanding queue of 16 per thread. It is then tested in set intervals in multiple thread/queue depth profiles to show performance under light and heavy usage. Since hard drives reach their rated performance level very quickly, we only graph out the main sections of each test.

Preconditioning and Primary Steady-State Tests:

  • Throughput (Read+Write IOPS Aggregate)
  • Average Latency (Read+Write Latency Averaged Together)
  • Max Latency (Peak Read or Write Latency)
  • Latency Standard Deviation (Read+Write Standard Deviation Averaged Together)

Our Enterprise Synthetic Workload Analysis includes four profiles based on real-world tasks. These profiles have been developed to make it easier to compare to our past benchmarks as well as widely-published values such as max 4k read and write speed and 8k 70/30, which is commonly used for enterprise drives.

  • 4k
    • 100% Read or 100% Write
    • 100% 4k
  • 8k 70/30
    • 70% Read, 30% Write
    • 100% 8k
  • 128k (Sequential)
    • 100% Read or 100% Write
    • 100% 128k

In the first of our enterprise workloads, we measured a long sample of random 4k performance with 100% write and 100% read activity to get our main results. When populated with the Toshiba HK3R2 SSD (RAID6), the DS1819+ posted its top performance in iSCSI with an impressive 37,408 IOPS read and 20,648 IOPS write. In our HDD configuration (Toshiba N300 NAS 8TB), it showed 2,294 IOPS read and 1,183 IOPS write (iSCSI). In CIFS, writes were nearly identical, showing 1,127 IOPS. However, reads showed an underwhelming 295 IOPS.

When looking at average latency using a heavy 16T/16Q load, the DS1819+ saw iSCSI scores of 6.84ms read and 12.39ms write with the SSDs and 111.66ms and 216.38ms with the HDDs. The CIFS performance was higher for both the SSD, 11.66ms read and 216.38ms write, and the HDD, 865.67ms read and 226.95ms write.

Looking at max latency, the DS1819+ showed the best read performance in iSCSI with 47.6ms for the SSD and 1,821.8ms for the HDD, compared to 147.7ms for the SSD and 3,040.1ms for the HDD in CIFS. CIFS had better read performance with 235.7ms for the SSD (compared to 377.9ms in iSCSI) and 5,725.2ms for the HDD (compared to 7,012.7ms in iSCSI). 

The last part of our series of 4K benchmarks looks at latency consistency via standard deviation. In this scenario, the DS1819+ again had the best read performance in iSCSI and best write performance in CIFS. For SSDs we saw 7.8ms in reads and 19.61ms write in iSCSI and 24.39ms read and 18.3ms write in CIFS. For HDDs we say 104.99ms read and 372.37ms write in iSCSI and 746.33ms read and 394.79ms write in CIFS. 

Our next benchmark measures 100% 8K sequential throughput with a 16T16Q load in 100% read and 100% write operations. Here, the DS1819+ performance under iSCSI while populated with SSDs, showed 57,592 IOPS in reads and 40,395 IOPS in writes. Our HDD iSCSI configuration also showed impressive read and write results, with 55,81 IOPS and 36,304 IOPS, respectively. CIFS showed very close performance between to two media with 

Compared to the fixed 16 thread, 16 queue max workload we performed in the 100% 4k write test, our mixed workload profiles scale the performance across a wide range of thread/queue combinations. In these tests, we span workload intensity from 2 threads and 2 queues up to 16 threads and 16 queues. As you can from the chart below, the Synology DS1819+ had three relatively steady performances in both HDDs (ranging from 201 to 200 IOPS for HDD CIFS and 446 to 1,344 IOPS for HDD iSCSI) and the SSD in CIFS (ranging from 4,975 to 4,957 IOPS). The SSD in iSCSI ranged from 9,100 to 23,548 IOPS. 

When looking at 8k 70/30 average response times, the DS1819+ had the opposite with the SSDs being more steady and the HDDs spiking up in latency. The SSDs ranged from 0.43 to 10.86ms for iSCSI and 0.8 to 51.73ms for CIFS. For HDDs we saw a range of 8.93 to 190.16ms for iSCSI and 19.8 to 1,264.6ms for CIFS.

With 8k 70/30 max latency, the DS1819+ saw SSD performance of iSCSI ranging from 66.54ms to 345.6ms and CIFS ranging from 63.98ms to 281.74ms. HDD performance ranged from 609.6ms to 4,260ms for iSCSI and 667.30ms to 5,722ms for CIFS. 

And for 8k 70/30 standard deviation the SSDs ranged from 0.43ms to 16.27ms iSCSI and 0.51ms to 12.85ms for CIFS. The HDDs ranged from 15.39ms to 355.13ms in iSCSI and 22.33ms to 537.36ms in CIFS. 

The last Enterprise Synthetic Workload benchmark is our 128K test, which is a large-block sequential test that shows the highest sequential transfer speed for a device. In this workload scenario, the DS1819+ had fairly strong read performance across the board with 1.66GB/s HDD iSCSI, 1.61GB/s SSD CIFS, 1.49GB/s HDD CIFS, and 1.16GB/s SSD iSCSI. For writes we saw 507MB/s HDD iSCSI, 782MB/s SSD CIFS, 749MB/s HDD CIFS, and 666MB/s SSD iSCSI.

Conclusion

Synology’s 8-bay DS1819+ is the newest member of the DS18xx+ family. The DS1819+ comes equipped with a Quad Core 2.1GHz CPU with an AES-NI hardware encryption engine, 4GB DDR4 RAM with expansion capabilities up to 32GB, and four RJ-45 1GbE LAN ports with link aggregation and failover support. As with most newer model NAS in Synology’s + series, the DS1819+ features a PCIe expansion slot, one of the bigger selling points of the NAS. By itself, the 8-bay DS1819+ has a maximum capacity of 112TB, but can reach up to 252TB when using the two DX517 expansion units.

On the subject of performance, the DS1819+ is a breath of fresh air when looking back at the DS1817+, showing increased performance in every test. The overall best configuration was in iSCSI while populated with the Toshiba HK3R2 960GB SSDs. During our 100% read/write random 4k test, the DS1819+ posted results at 37,408 IOPS read and 20,648 IOPS write. In HDD configurations, the DS1819+ showed its best performance in iSCSI with 2,294 IOPS read and 1,183 IOPS write. During our 8k sequential throughput tests, the DS1819+ recorded its best performance under iSCSI while populated with SSDs, showing 57,592 IOPS in reads and 40,395 IOPS in writes.

In both of our application benchmarks measuring SQL Server and MySQL database peformance the DS1819+ improved over its previous-generation offering. SQL test results have improved compared to the previous model, with aggregate score of 6,082.8 TPS and an average latency of 189ms, putting it slightly above the Netgear 628x. A similar outcome was measured in our Sysbench test, where the DS1819+ measured 1,167 TPS in aggregate, an area where the previous model measured 753 TPS.

The DS1819+ updates the core components of the DS1817+ while also supporting a larger RAM footprint for today's more demanding applications. Of course Synology's DSM software is there too, which is the most comprehensive NAS OS package on the market, both in terms of native configuration options and support for third party applications. While visually they look the same, the DS1819+ takes over as the 8-bay workhorse for Synology and will do well in the SMB, SOHO and edge computing use cases it's designed for. 

Synology DS1819+ at Amazon

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