Synology DS918+ 4-bay NAS Features
- Powerful and scalable 4-bay NAS for growing businesses
- Encrypted sequential throughput at over 225 MB/s reading and 221 MB/s writing
- Quad-core processor with AES-NI hardware encryption engine
- 4GB DDR3L-1866 memory, expandable up to 8GB
- Dedicated M.2 NVMe SSD slots for system cache support
- Dual 1GbE LAN with failover and Link Aggregation support
- Scalable up to 9 drives with Synology DX5172
- Advanced Btrfs file system offering 65,000 system-wide snapshots and 1,024 snapshots per shared folder
- Dual-channel H.265/H.264 4K video transcoding on the fly
Do I need NVMe slots filled?
If you need to increase IOPS than it would be recommended to have SSD cache slots filled. It will be used for read/write caching operations. That will improve the speed between data input and output. There is a benefit of having cache enabled if you are planning to use NAS as a database server or for virtual machines. Anything that requires a high number of small data constantly being sent forwards and backward.
Do I need to fill all 4 bays?
No, you can start with a 1 drive only if you wish. Adding 2 drives will give you redundancy benefit. If one drive gets broken, service will be uninterrupted. You can still read and write files on your NAS. The smart choice would be 3 drive option to start with if budget is limited. In this scenario- instead of losing the half capacity to redundancy function, you will lose only 1/3.
Why two LAN ports?
As you have probably noticed, performance reports of DS918+ show similar results with HDD and SSD solutions. Similar hardware NAS from Qnap (TS-453BT3) will perform twice as fast. This is simply based on bottleneck on network connectivity. DS918+ has only 2 network ports performing at max speed 120MB/s each. If you have a smart switch you can double the speed to 2Gb/s by enabling link aggregation. In Qnap setup difference is made by 10GbE card pre-installed. Not always you need data transfer at that speed and dual gigabit port option is more than enough for a NAS solution.
Link aggregated switch necessary for doubling Synology speeds:
Add two Gigabit Ethernet ports and a USB 3.0 pass-through port to your laptop through a single USB 3.0 port. This will balance transferred data over two network connection allowing you to receive/send data without overloading your single network connection.
DS918 for plex?
This will be the perfect solution for a Plex media server. It will be quick enough to let you stream multiple videos at the same time. But it gets even better. It has enough power to transcode video streams on the fly. That will let users stream videos over slower networks like 3G on a mobile phone. It also keeps load lower on your network, letting more devices connect and use network functions.
DS918+ can transcode videos as high as at 1080p resolution. That is still the most popular resolution used still today.
DS video Media Server
For 4K transcoding use DS video app. As it is developed by Synology themselves, it has an access to a transcoding engine – built inside the CPU. This lets you transcode much higher resolution videos without overloading processor itself.
How fast is DS918+?
1GbE SMB – Sequential Throughput via Encrypted Shared Folder (64KB)
1GbE SMB – Windows File Transfer (1MB file x 3000)
1GbE SMB – Windows File Transfer via Encrypted Shared Folder (1MB file x 3000)
1GbE AFP – Mac File Transfer (3GB file x 1)
1GbE AFP – Mac File Transfer (1MB file x 3000)
1GbE Web Server – PHP Response Efficiency
|Responses per second||13134.27||5996.57||13690.33||8457.31||8874.15||5585.42||3317|
RAM upgrade options
Max 4GB +2GB = TOTAL 8GB
Crucial Compatible RAM Upgrade
4GB +2GB = TOTAL 8GB
8GB +2GB = TOTAL 10GB
8GB +8GB = TOTAL 16GB
CPU can only address 8GB per channel (slot). So max 16GB (2x8GB).
Synology tested SMART UPS list:
Max size HDD?
|HGST||HUH721212ALE600 – 0F30144||Ultrastar He12||3D0||12TB|
|Seagate||ST12000NE0007 – 2GT116||IronWolf Pro||EN01||12TB|
|Seagate||ST12000NM0007 – 2A1101||Enterprise Capacity 3.5 HDD V.7||SN01||12TB|
|Seagate||ST12000VN0007 – 2GS116||IronWolf||SC60||12TB|
Compatible NVMe M.2 sticks
+cache slots built-in
-no PCIe slot