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Synology Network Attached Storage DS918+ 4 bay DiskStation 1.5GHz 4GB Brown Box

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Product Description


Hardware Specifications
CPU Model:Intel Celeron J3455
CPU Architecture:64-bit
CPU Frequency:Quad Core 1.5 burst up to 2.3 GHz
Hardware Encryption Engine (AES-NI):Yes
Hardware Transcoding Engine:H.264 (AVC), H.265 (HEVC), MPEG-2 and VC-1 maximum resolution: 4K (4096 x 2160) maximum frame rate per second (FPS): 30

System Memory:4 GB DDR3L
Memory Module Pre-installed:4GB (1 x 4GB)
Total Memory Slots:2
Memory Expandable up to:8 GB (4 GB x 2)

Drive Bays:4
Maximum Drive Bays with Expansion Unit:9
M.2 Drive Slots:2
Compatible Drive Type :3.5 SATA HDD
M.2 NVMe 2280 SSD
Maximum Internal Raw Capacity:48 TB (12 TB drive x 4) (Capacity may vary by RAID types)
Maximum Raw Capacity with Expansion Units:108 TB (12 TB drive x 9) (Capacity may vary by RAID types)
Maximum Single Volume Size:108 TB
Hot Swappable Drive:Yes
Notes:Compatible drive type indicates the drives that have been tested to be compatible with Synology products. This term does not indicate the maximum connection speed of each drive bay.
The maximum single volume size is not directly related to the maximum raw capacity.
Expansion of the internal volume is only supported if the combined single volume size does not exceed the maximum limit of 108TB.

External Ports
RJ-45 1GbE LAN Port:2 (with Link Aggregation / Failover support)
USB 3.0 Port:2
eSATA Port:1

File System
Internal Drives:Btrfs
External Drives:Btrfs
Notes:exFAT Access is purchased separately in Package Center.

System Fan:92 mm x 92 mm x 2 pcs
Fan Speed Mode:Full-Speed Mode
Cool Mode
Quiet Mode
Brightness adjustable front LED indicators:Yes
Power Recovery:Yes
Noise Level:19.8 dB(A)
Scheduled Power On/Off:Yes
Wake on LAN/WAN:Yes
Power Supply Unit / Adapter:100W
AC Input Power Voltage:100V to 240V AC
Power Frequency:50/60 Hz, Single Phase
Power Consumption:28.8 W (Access)
12.6 W (HDD Hibernation)
British Thermal Unit:98.27 BTU/hr (Access)
42.99 BTU/hr (HDD Hibernation)

DSM Specifications
Storage Management
Maximum Internal Volume Number:512
Maximum iSCSI Target Number:32
Maximum iSCSI LUN:256
iSCSI LUN Clone/Snapshot, Windows ODX:Yes
Supported RAID Type:Synology Hybrid RAID
RAID Migration:Basic to RAID 1
Basic to RAID 5
RAID 1 to RAID 5
RAID 5 to RAID 6
Volume Expansion with Larger HDDs:Synology Hybrid RAID
Volume Expansion by Adding a HDD:Synology Hybrid RAID
RAID 6 (with Expansion Unit)
Global Hot Spare Supported RAID Type:Synology Hybrid RAID
RAID 6 (with Expansion Unit)
RAID 10 (with Expansion Unit)

SSD Support
SSD Read/Write Cache (White Paper):Yes

File Sharing Capacity
Maximum Local User Accounts:2048
Maximum Local Groups:256
Maximum Shared Folder:512
Maximum Shared Folder Sync Tasks8
Maximum Concurrent CIFS/AFP/FTP Connections:1000
Windows Access Control List (ACL) Integration:Yes
NFS Kerberos Authentication:Yes
High Availability Manager:Yes
Log Center:Yes
Syslog Events per Second:800

VMware vSphere 6 with VAAI:Yes
Windows Server 2012:Yes
Windows Server 2012 R2:Yes
Citrix Ready:Yes

Add-on Packages
Antivirus by McAfee (Trial):Yes
Central Management System:Yes
Maximum Users:1500
Notes:The number of concurrent HTTP connections for Chat was configured to the maximum.
CPU and RAM usage were both under 80% when the number of maximum users was reached.
For tested models with expandable memory, the maximum amount of RAM was installed.
Cloud Station Server:Yes
Maximum Number of Concurrently Connected Devices:1000
Maximum Number of Concurrently Connected Devices (with RAM expansion):2000
Maximum Number of Synced Files (btrfs):1,000,000 / single file reaction time 744 ms
Maximum Number of Synced Files (ext4):1,000,000 / single file reaction time 630 ms
Notes:The maximum number of concurrently connected devices refers to the maximum number of devices that can remain connected at the same time. For more information on file processing capability, please refer to the reaction time for file processing.
File reaction time refers to the preparation time required for other devices to start downloading a 1KByte file from a Synology NAS after the file has been added to the NAS. RAM expansion was not used during testing.
Non-encrypted shared folders were used during the aforementioned testing.
Document Viewer:Yes
Download Station:Yes
Maximum Concurrent Download Tasks:80
exFAT Access (optional):Yes
MailPlus / MailPlus Server:Yes
Free Email Accounts:5 (Licenses required for additional accounts)
Recommended MailPlus Client Number:Up to 90 (Btrfs) / 90 (ext4)
Maximum Server Performance:840,000 (Btrfs) / 1,014,000 (ext4) emails per day, approx. 25.6 GB (Btrfs) / 30.9 GB (ext4)
Notes:The CPU and RAM usages were both under 80% when testing recommended client numbers.
For tested models with expandable memory, the maximum amount of RAM was installed.

Read-write SSD cache was enabled in 5-bay (and above) NAS models with 2 SSDs units installed.
The performance of the mail system will slightly decrease in high-availability mode due to data synchronization between the two servers.
Functions that were enabled in all of the tests above: anti-spam, anti-virus, DNSBL, greylist, content scan, full-text search (English only).
Media Server:Yes
DLNA Compliance:Yes
Maximum Users:200
Maximum Simultaneous Editing Users:80
Notes:CPU and RAM usage were both under 80% when the number of maximum users was reached.
For tested models with expandable memory, the maximum amount of RAM was installed.
Client performance may affect maximum simultaneous editing users. Client PCs used for testing: Intel Core i3-3220 / 8GB RAM
Snapshot Replication:Yes
Maximum Snapshots per Shared Folder:1024
Maximum Snapshots of all Shared Folder:65536
Surveillance Station:Yes
Maximum IP cam (Licenses required):40 (including 2 Free License)
Total FPS (H.264):1200 FPS at 720p (1280x720)
840 FPS at 1080p (19201080)
550 FPS at 3M (2048x1536)
300 FPS at 5M (2591x1944)
180 FPS at 4K (3840x2160)
Total FPS (H.265):1200 FPS at 720p (1280x720)
1200 FPS at 1080p (19201080)
900 FPS at 3M (2048x1536)
550 FPS at 5M (2591x1944)
300 FPS at 4K (3840x2160)
Total FPS (MJPEG):720 FPS at 720p (1280x720)
500 FPS at 1080p (19201080)
330 FPS at 3M (2048x1536)
200 FPS at 5M (2591x1944)
Notes:Surveillance Station throughput is tested with Axis network camera, using continuous recording with live view from Surveillance Station and motion detection by camera. Live view and recording are sharing the same stream from the camera.
Video Station:Yes
Video Transcoding:4K Group 1
Maximum Transcoding Channel Number:2 channel, 30 FPS at 4K (4096 x 2160), H.264 (AVC)/H.265 (HEVC) or 2 channel, 30 FPS 1080p (19201080), H.264 (AVC)/H.265 (HEVC)/MPEG-2/VC-1
VPN Server:Yes
Maximum Connections:20

Environment Packaging
Environment:RoHS Compliant
Packaging Content:Main Unit X 1
Accessory Pack X 1
AC Power Adapter X 1
AC Power Cord X 1
RJ-45 LAN Cable X 2
Quick Installation Guide X 1
Optional Accessories:Surveillance Device License Pack
D3NS1866L-4G RAM Module
Expansion Unit: DX517 X 1

Item Dimension (L inchxW inchxH inch)
11 x 9 x 10
DIM Weight
8.84 lbs


Base SKU207030

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How do product returns work?
You may return any new purchased that is "dead on arrival," arrives in damaged condition, or is still in unopened boxes, for a full refund within 30 days of purchase. We reserve the right to test "dead on arrival" returns and impose a customer fee equal to 15 percent of the product sales price if the customer misrepresents the condition of the product. Any returned that is damaged through customer misuse, is missing parts, or is in unsellable condition due to customer tampering will result in the customer being charged a higher restocking fee based on the condition of the product. We will not accept returns of products that are more than 30 days after you receive the shipment. 

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