RackStation RS3618xs

High performance and scalable NAS simplifies data management, optimizes virtualization environments for large scale businesses.

High-speed scalable storage server

Synology RS3618xs is a reliable, superior-performance network-attached storage solution for large-scale enterprises with demanding business applications. It simplifies data management, optimizes virtualization environments, and rapidly expands storage capacity with minimal time investment in setup and maintenance.

CPU

quad-core up to 2.7GHz

RAM options

8GB DDR4 ECC UDIMM, up to 64GB

Network

4 x 1GbE port, optional 10GbE NIC support

Scalability

Up to 36 drives with RX1217/RX1217RP

CPU	CPU Model	Intel Xeon D-1521
	CPU Quantity	1
	CPU Core	4
	CPU Architecture	64-bit
	CPU Frequency	2.4 (base) / 2.7 (turbo) GHz
	Hardware Encryption Engine
Memory	System Memory	8 GB DDR4 ECC UDIMM
	Memory Module Pre-installed	8 GB (8 GB x 1)
	Total Memory Slots	4
	Maximum Memory Capacity	64 GB (16 GB x 4)
	Notes	Synology reserves the right to replace memory modules with the same or higher frequency based on supplier’s product life cycle status. Rest assured that the compatibility and stability have been strictly verified with the same benchmark to ensure identical performance. Please select Synology memory modules for optimum compatibility and reliability. Synology will not provide complete product warranty or technical support if non-Synology memory modules are used for memory expansion. For more information on the recommended memory configurations, visit here.
Storage	Drive Bays	12
	Maximum Drive Bays with Expansion Unit	36 (RX1217 x 2)
	Drive Type (See all supported drives)	3.5″ SATA HDD 2.5″ SATA HDD 2.5″ SATA SSD
	Hot Swappable Drive*
External Ports	RJ-45 1GbE LAN Port	4
	USB 3.2 Gen 1 Port	2
	Expansion Port	2
	Expansion Port Type	Infiniband
PCIe	PCIe Expansion	2 x Gen3 x8 slots (x8 link)
Appearance	Form Factor (RU)	2U
	Size (Height x Width x Depth)	88 mm x 482 mm x 724 mm
	Weight	14.5 kg
	Rack Installation Support*	4-post 19″ rack (Synology Rail Kit – RKS-02)
	Notes	The rail kit is sold separately
Others	System Fan	80 mm x 80 mm x 4 pcs
	Fan Speed Mode	Full-Speed Mode Cool Mode Quiet Mode
	Easy Replacement System Fan
	Power Recovery
	Noise Level*	50.2 dB(A)
	Scheduled Power On / Off
	Wake on LAN / WAN
	Power Supply Unit / Adapter	500 watts
	AC Input Power Voltage	100V to 240V AC
	Power Frequency	50/60 Hz, Single Phase
	Power Consumption*	142.76 watts (Access) 55.05 watts (HDD Hibernation)
	British Thermal Unit	487.12 BTU/hr (Access) 187.84 BTU/hr (HDD Hibernation)
	Notes	Power consumption is measured when it is fully loaded with Western Digital 1TB WD10EFRX hard drive(s). Noise Level Testing Environment: Fully loaded with Seagate 2TB ST2000VN000 hard drive(s) in the idle state. Two G.R.A.S. Type 40AE microphones, each set up 1 meter away from the Synology NAS at the front and rear. Background noise: 16.49-17.51 dB(A); Temperature: 24.25-25.75˚C; Humidity: 58.2-61.8%
Temperature	Operating Temperature	5°C to 35°C (40°F to 95°F)
	Storage Temperature	-20°C to 60°C (-5°F to 140°F)
	Operating Humidity	8% to 80% RH
	Storage Humidity	5% to 95% RH
Certification	FCC CE BSMI VCCI RCM EAC CCC KC BIS
Warranty	5 Years
	Notes	The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more)
Environment	RoHS Compliant
Packaging Content	Main Unit X 1 Accessory Pack X 1 AC Power Cord X 1 Quick Installation Guide X 1
Optional Accessories	DDR4 ECC UDIMM: D4EC-2666-8G/D4EC-2666-16G Expansion Units: RX1217/RX1217RP Enterprise Series 3.5″ SATA HDD: HAT5300 Series Enterprise Series 2.5″ SATA SSD: SAT5200 Series M.2 SSD & 10GbE Combo Adapter Card: E10M20-T1 M.2 SSD Adapter Card: M2D20/M2D18 25GbE Network Interface Card: E25G30-F2 10GbE Network Interface Card: E10G30-F2/E10G30-T2/E10G18-T1 Rail Kit Sliding: RKS-02
	Notes	All memory modules will operate at the maximum frequency specified by the CPU manufacturer.

DSM Specifications
Storage Management	Maximum Single Volume Size	1 PB (64 GB memory required, for RAID 6 groups only) 200 TB (32 GB memory required) 108 TB
	Maximum Internal Volume Number	128
	SSD Read/Write Cache (Determining cache size)
	SSD TRIM
	RAID Group
	Supported RAID Type	RAID F1 Basic JBOD RAID 0 RAID 1 RAID 5 RAID 6 RAID 10
	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	RAID F1 RAID 1 RAID 5 RAID 6 RAID 10
	Volume Expansion by Adding a HDD	RAID F1 JBOD RAID 5 RAID 6
	Global Hot Spare Supported RAID Type	RAID F1 RAID 1 RAID 5 RAID 6 RAID 10
	Notes	Volumes over 108 TB require 32 GB of memory or more. Actual maximum storage pool and volume sizes depend on drive sizes used, the number of drive bays available, and the RAID configuration. Usable capacity for each volume will be lower than the maximum volume size and is dependent on the filesystem and the amount of system metadata stored. When Peta Volume is enabled, validated services and packages are required. Please refer to this article for more information on limitations.
File System	Internal Drives	Btrfs ext4
	External Drives	Btrfs ext4 ext3 FAT32 NTFS HFS+ exFAT
File Services	File Protocol	SMB AFP NFS FTP WebDAV Rsync
	Maximum Number of SMB Connections (FSCT-Based)	500
	Windows Access Control List (ACL) Integration
	NFS Kerberos Authentication
	Notes	Connection value of this model is tested with Synology SATA SSD fully populated and up to four 10GbE network ports Models with expandable memory are tested with the maximum supported quantity installed. SMB performance was evaluated using Microsoft File Server Capacity Tool (FSCT) version 1.3, with the following configuration: Test workload: HomeFolder scenario provided by the FSCT tool Test duration: 600 seconds Domain controller & FSCT controller: Windows Server 2022 FSCT clients: 8 × Windows 10 machines SMB feature: Directory leasing enabled
Account & Shared Folder	Maximum Local User Accounts	2,048
	Maximum Local Groups	512
	Maximum Shared Folder	512
	Maximum Shared Folder Sync Tasks	12
Hybrid Share	Maximum Hybrid Share Folders	15
Hyper Backup	Folder and Package Backup
	Entire System Backup
	Notes	Full-system backup requires DSM 7.2 or later.
High Availability	Synology High Availability
Log Center	Syslog Events per Second	3,000
Virtualization	VMware ESXi 6.5 and VAAI
	Windows Server 2012
	Windows Server 2012 R2
	Windows Server 2016
	Windows Server 2019
	Citrix Ready
	OpenStack
General Specifications	Supported Protocols	SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, Fibre Channel, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV
	Supported Browsers	Chrome Firefox Edge Safari
	Supported Language	English, Deutsch, Français, Italiano, Español, Dansk, Norsk, Svenska, Nederlands, Русский, Polski, Magyar, Português do Brasil, Português Europeu, Türkçe, Český, ภาษาไทย, 日本語, 한국어, 繁體中文, 简体中文
	Notes	For an updated list of supported browser versions, check the DSM Technical Specifications.
Add-on Packages view the complete package list
Central Management System
Synology Chat	Maximum Number of Users	500
	Notes	Measured with simulated users, each with an average record of 20,000 messages, emojis, or stickers. The required server response time is below ten seconds. Models with expandable memory are tested with the maximum supported quantity installed.
Download Station	Maximum Concurrent Download Tasks	80
SAN Manager	Maximum iSCSI Target Number	64
	Maximum LUN	128
	LUN Clone/Snapshot, Windows ODX
Synology MailPlus / MailPlus Server	Free Email Accounts	5 (Additional accounts require purchase of licenses)
	Maximum Number of Users	1,100
	Notes	The suggested maximum number of users is based on the following workload: 20% of users with a 20,000 item mailbox randomly performing actions and receiving 240 emails per day, and 80% of users receiving 20 emails per day. Learn more Models with SSD support are tested with a single SSD volume. Models with expandable memory are tested with the maximum supported quantity installed. Learn more about memory requirements. Operating in high-availability mode will incur additional overhead. Features enabled during evaluation: anti-spam, anti-virus, DNSBL, greylist, content scanning, and full-text search (English).
Media Server	DLNA Compliance
Synology Photos	Facial Recognition
	Object Recognition
Snapshot Replication	Maximum Snapshots per Shared Folder	256
	Maximum of System Snapshots	4,096
Surveillance Station	Default Licenses	2 (Additional cameras require purchase of licenses)
	Suggested Maximum IP Cameras and Total FPS (H.264)	1080p: 75 channels, 2100 FPS 3M: 75 channels, 1500 FPS 5M: 75 channels, 900 FPS 4K: 55 channels, 550 FPS
	Suggested Maximum IP Cameras and Total FPS (H.265)	1080p: 75 channels, 2250 FPS 3M: 75 channels, 2250 FPS 5M: 75 channels, 1500 FPS 4K: 75 channels, 900 FPS
	Notes	Performance figures are obtained from testing conducted with the device fully populated with drives, with their default memory configuration, and under a continuous recording setup. Actual system capabilities may vary based on configuration, drive performance, enabled features, and the presence of additional workloads. Use NVR Selector to quickly find a suitable model based on your requirements. The number of streams that can be viewed simultaneously is twice the suggested maximum number of cameras. For example, if the suggested maximum number of cameras for a model is 10 under H.264, 1080p, the model can support up to 20 streams of the same specification at the same time.
Synology Drive	Maximum Number of Users	900
	Maximum Number of Hosted Files	15,000,000 (applies to files indexed or hosted by Synology Drive. For file access through other standard protocols, refer to the File Services section above)
	Notes	The suggested maximum number of users is based on the following workload: 20% of users randomly perform file operations (upload, download, move, and delete), and 80% of users are logged in but idle. Learn more Models with SSD support are tested with a single SSD volume. Models with expandable memory are tested with the maximum supported quantity installed. Exceeding the recommended numbers above will not block application operations, but may result in longer response time. Btrfs file system and non-encrypted shared folders were used during the aforementioned testing.
Synology Office	Maximum Number of Users	900
	Notes	The suggested maximum number of users is based on the following workload: 20% of users are executing random actions at an average of 30-second intervals, and 80% of users are logged in and viewing a file. Learn more Models with SSD support are tested with a single SSD volume. Models with expandable memory are tested with the maximum supported quantity installed. Client performance may affect maximum simultaneous editing users. Client PCs used for testing: Intel Core i3-3220 / 8GB RAM
Virtual Machine Manager	Recommended Virtual Machine Instances	8 (Learn more)
	Recommended Virtual DSM Number (Licenses required)	8 (including 1 Free License)
	Notes	The specifications vary depending on system configuration and memory size.
VPN Server	Maximum Connections	12