RC18015xs+

RackStation RC18015xs+

Uncompromising reliability, unyielding data protection

High-availability cluster design

By combining two RC18015xs+ and at least one RXD1215sas, the Synology high-availability cluster delivers unyielding reliability and data availability. With the active/passive structure, services are automatically switched over to one server if the other unexpectedly goes offline, helping your business avoid costly downtime.

CPU
Intel® Quad-core up to 3.7 GHz

Memory
8GB DDR3 ECC RAM, up to 32GB

Ultra Performance
2,153.26 MB/s reading

Scalability
Up to 180 drives with 15 RXD1215sas

Hardware redundancy enhances system uptime

In addition to the active/passive architecture, RC18015xs+ is equipped with redundant hardware components, such as power supply units, internal system fans, and LAN ports, to optimize service continuity.

Scalable to 10GbE, and beyond

The PCIe 3.0 slot allows for faster networking as you expand your infrastructure. Together with the built-in quad Gigabit ports, RC18015xs+ offers comprehensive connectivity options for link aggregation and failover configurations.

5 Year Warranty

Synology’s 5-year limited warranty provides hardware replacement and technical support via email and telephone services, maximizing your enterprises’ return on investment.

Synology Replacement Services(SRS)

SRS provides free advance replacement units as early as the next business day in selected regions, maximizing the service uptime for your mission-critical storage and ensuring your business continuity.

Complete iSCSI and virtualization solutions

Synology iSCSI storage fully supports most virtualization solutions to enhance work efficiency with easy management interface. VMware vSphere 6 and VAAI integration helps offload storage operations and optimizes computation efficiency. Windows Offloaded Data Transfer (ODX) speeds up data transfer and migration rate. OpenStack Cinder support turns your Synology NAS into a block-based storage component.

Next-generation file system for better data protection

The Btrfs file system introduces advanced storage technologies and optimized snapshots to prevent data corruption and reduce maintenance overhead. While ensuring high-level data integrity, it also offers flexible, efficient data protection and recovery tools.

Flexible Shared Folder / User Quota System provides comprehensive quota control on user accounts and shared folders

Snapshot Replication provides schedulable and storage capacity-saving data protection with 1,024 shared folder backups and 65,000 system-wide snapshots

 
File- or folder-level data restoration accelerates data recovery, providing more flexibility for businesses

 
Automatic file self-healing detects and recovers corrupted files without user intervention

CMS

Manage multiple Synology NAS servers simultaneously on a centralized interface to increase business efficiency.

MailPlus

Secure, reliable, and private mail server solution with an intuitive and modern mail client.

Hyper Backup

Store multiple backup versions with block-level incremental data backup and cross-version deduplication.

Office

Collaborate on spreadsheets and documents on your private cloud.

Snapshot Replication

Provides schedulable and instantaneous data protection for shared folders and virtual machines on iSCSI LUNs in the event of disaster.

Security

Comprehensive built-in security tools are constantly updated to tackle evolving threats and protect your devices.

Hardware Specifications 
CPU 
CPU ModelIntel Xeon E3-1230 v2
CPU Architecture64-bit
CPU FrequencyQuad Core 3.3 GHz
Hardware Encryption Engine (AES-NI) 
Memory 
System Memory8 GB DDR3 ECC
Memory Module Pre-installed8GB (2 x 4GB)
Total Memory Slots4
Memory Expandable up to32 GB (8 GB x 4)
Storage 
Maximum Drive Bays with Expansion Unit180
Compatible Drive Type* (See all supported drives)3.5″ SAS HDD
 2.5″ SAS HDD
 2.5″ SAS SSD
  
Maximum Raw Capacity with Expansion Units1800 TB (10 TB drive x 180) (Capacity may vary by RAID types)
Maximum Single Volume Size200 TB (32GB RAM required, for RAID 5 or RAID 6 groups only)
 108 TB
  
External Ports 
RJ-45 1GbE LAN Port4 (with Link Aggregation / Failover support) + 1 for Heartbeat
USB 3.0 Port2
Expansion Port1
PCIe 
PCIe Expansion1 x Gen3 x8 slot (x8 link)
Add-in-card supportPCIe Network Interface Card (Learn more)
File System 
Internal DrivesBtrfs
 EXT4
  
External DrivesBtrfs
 EXT4
 EXT3
 FAT
 NTFS
 HFS+
 exFAT*
  
NotesexFAT Access is purchased separately in Package Center.
Appearance 
Size (Height x Width x Depth)44 mm x 430 mm x 480 mm
Weight7.3 kg
Others 
System Fan40 mm x 40 mm x 6 pcs
Fan Speed ModeFull-Speed Mode
 Cool Mode
 Quiet Mode
  
Easy Replacement System Fan 
Power Recovery 
Noise Level*48 dB(A)
Scheduled Power On/Off 
Wake on LAN/WAN 
Power Supply Unit / Adapter2 X 150W
AC Input Power Voltage100V to 240V AC
Power Frequency50/60 Hz, Single Phase
Power Consumption*60.16 W (Access)
British Thermal Unit205.27 BTU/hr (Access)
Redundant Power Supply (for xs+ and RP model) 
Environment Temperature 
Operating Temperature5°C to 35°C (40°F to 95°F)
Storage Temperature-20°C to 60°C (-5°F to 140°F)
Relative Humidity5% to 95% RH
CertificationEAC
 CCC
 FCC
 CE
 BSMI
  
Warranty5 Years
NotesWhen upgrading RAM to more than 24GB, the original 4GB RAM modules must be removed.
DSM Specifications ( See more ) 
Storage Management 
Maximum Internal Volume Number1024
Maximum iSCSI Target Number128
Maximum iSCSI LUN512
iSCSI LUN Clone/Snapshot, Windows ODX 
SSD Read/Write Cache (White Paper)  
SSD TRIM 
RAID Group 
Supported RAID TypeRAID F1
 Basic
 JBOD
 RAID 0
 RAID 1
 RAID 5
 RAID 6
 RAID 10
  
RAID MigrationBasic to RAID 1
 Basic to RAID 5
 RAID 1 to RAID 5
 RAID 5 to RAID 6
  
Volume Expansion with Larger HDDsRAID F1
 RAID 1
 RAID 5
 RAID 6
  
Volume Expansion by Adding a HDDRAID F1
 RAID 5
 RAID 6
 JBOD
  
Global Hot Spare Supported RAID TypeRAID F1
 RAID 1
 RAID 5
 RAID 6
 RAID 10
  
File Sharing Capacity 
Maximum Local User Accounts16000
Maximum Local Groups512
Maximum Shared Folder512
Maximum Shared Folder Sync Tasks32
Maximum Concurrent CIFS/AFP/FTP Connections2048
Windows Access Control List (ACL) Integration 
NFS Kerberos Authentication 
High Availability Manager 
Log Center 
Syslog Events per Second3000
Virtualization 
VMware vSphere 5 with VAAI 
VMware vSphere 6 with VAAI 
Windows Server 2012 
Windows Server 2012 R2 
Citrix Ready 
OpenStack 
Add-on Packages (learn more about the complete add-on package list)  
Antivirus by McAfee (Trial) 
Central Management System 
Chat 
Maximum Users6000
NotesThe 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 
Maximum Number of Concurrently Connected Devices2000
Maximum Number of Concurrently Connected Devices (with RAM expansion)10000
Maximum Number of Synced Files (btrfs)1,000,000 / single file reaction time 542 ms
Maximum Number of Synced Files (ext4)1,000,000 / single file reaction time 210 ms
NotesThe 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 10KByte 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 
Download Station 
Maximum Concurrent Download Tasks80
Drive 
Maximum Number of Synced Files3,000,000 / single file reaction time 244 ms
Maximum Number of Concurrent Connections for PC Clients1,800
NotesThe Btrfs file system was used for the purpose of testing.
 The maximum number of concurrent connections refers to the maximum number of connections that could be maintained when the maximum number of synced files was reached.
 File reaction time refers to the preparation time required for other devices to start downloading a 10KByte file from a Synology NAS after the file has been added to the NAS.
 For tested models with expandable memory, the maximum amount of RAM was installed.
 Non-encrypted shared folders were used during the aforementioned testing.
  
exFAT Access (optional) 
MailPlus / MailPlus Server 
Free Email Accounts5 (Licenses required for additional accounts)
Recommended MailPlus Client NumberUp to 500 (Btrfs) / 500 (EXT4)
Maximum Server Performance2,166,000 (Btrfs) / 2,418,000 (EXT4) emails per day, approx. 66.1 GB (Btrfs) / 73.8 GB (EXT4)
NotesThe 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 
DLNA Compliance 
Moments 
Facial recognition 
Subject recognition 
Office 
Maximum Users3000
NotesMultiple files were opened for testing and each file was edited by 30 users simultaneously.
 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
  
PetaSpace 
Snapshot Replication 
Maximum Snapshots per Shared Folder1024
Maximum Snapshots of all Shared Folder65536
Surveillance Station 
Maximum IP cam (Licenses required)90 (including 2 Free License) (See All Supported IP Cameras)
Total FPS (H.264)*2700 FPS @ 720p (1280×720)
 1080 FPS @ 1080p (1920×1080)
 650 FPS @ 3M (2048×1536)
 500 FPS @ 5M (2591×1944)
Total FPS (MJPEG)*900 FPS @ 720p (1280×720)
 360 FPS @ 1080p (1920×1080)
 250 FPS @ 3M (2048×1536)
 150 FPS @ 5M (2591×1944)
NotesSurveillance 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 
Video TranscodingGroup 1 – Type 2 (See more)
Maximum Transcoding Channel Number1 channel, 30 FPS @ 720p (1280×720), H.264 (AVC)/MPEG-4 Part 2 (XVID, DIVX5)/MPEG-2/VC-1
Virtual Machine Manager 
Maximum Virtual DSM Number (Licenses required)8 (including 1 Free License) (Learn more)
VPN Server 
Maximum Connections30
Environment & Packaging 
EnvironmentRoHS Compliant
Packaging ContentMain Unit X 1
 Accessory Pack X 1
 AC Power Cord X 2
 Quick Installation Guide X 1