Securing your business assets
The 16-bay RS4021xs+ provides solid data security and lightening-fast performance with over 234K 4K random read IOPS and 6,258 MB/s sequential read throughput1. Together with its 8-core processor, ECC memory, advanced snapshot technology, and built-in 10GbE connectivity, the RS4021xs+ can support large multi-user environments while handling data-intensive workloads.
Engineered for service continuity
The RS4021xs+ ensures mission-critical data is always available, enabling businesses to deliver the best results, even in the face of disaster.
Redundant power
Dual PSUs provide protection against a PSU failure or accidental cord removal while hot-swappable fans can be replaced without powering down the system.
Maximize service availability
Synology High Availability (SHA) pairs two identical units together creating an active-passive cluster with minute-level failover.
Next-generation file system
Btrfs prevents data corruption and reduces maintenance overheads with advanced storage technologies and optimized snapshots
Customize to your business
The RS4021xs+ includes two PCIe slots for performance, networking, and storage upgrades enabling it to adapt to any business environment2.
Double bandwidth
Upgrade network bandwidth in minutes by 2x or more with Synology’s range of 10GbE NICs.
SSD cache3
Boost read/write IOPS by up to 16 times by enabling SSD cache with our Synology M.2 NVMe adapter cards and SNV3500 SSDs, or by installing one or more 2.5” SAT5200 SSDs.
Storage expansion
Quickly and easily scale up to 40 drives with two RX1217(RP) expansion units.
Hyper Backup
A comprehensive backup and recovery solution for securing data stored on Synology servers. Backup data locally, to another Synology device, rsync server, or cloud-based storage such as Google Drive, Dropbox, S3-compatible destinations, and Synology C2. Deduplication4, integrity checks, and incremental transfer technology reduce bandwidth and storage used.
Snapshot Replication
Easily schedule flexible point-in-time backups of shared folders and iSCSI LUNs with an RPO as low as 5 minutes and recovery in seconds. Set up replication and failover to other Synology storage systems for fast RTOs and minimal service disruption.
Storage for virtualization
Synology iSCSI storage supports mainstream virtualization solutions with an easy management interface to enhance usability. VMware vSphere 6.5 and VAAI integration helps offload storage operations. Windows Offloaded Data Transfer (ODX) speeds up data transfer. OpenStack Cinder support turns your Synology NAS into a block-based storage component. Additionally, Synology Storage Console enables even more simplified storage provisioning and management options in VMware and Windows environments
All-in-one surveillance solution
Synology Surveillance Station transforms the RS4021xs+ into a feature-packed Network Video Recorder solution. Support for up to 90 IP cameras5 and video analytics such as motion detection, no idle zone, foreign object detection, and anomaly detection cater to the most common surveillance scenarios.
Secure and private
AES-256 encryption keeps locally-stored footage secure.
Access from anywhere, anytime
Access recordings and live streams whenever you want using a web browser, desktop client, or the DS cam mobile app.
Real-time alerts
Email, SMS, or push notifications alert you when incidents occur or predefined conditions are met.
Specifications
| Storage |
| RAID levels |
5, 6 |
| RAID support |
Yes |
| Storage drive sizes supported |
2.5,3.5" |
| Storage drive interface |
Serial ATA II, Serial ATA III |
| Supported storage drive types |
HDD & SSD |
| Installed storage drive type |
No |
| Number of storage drives supported |
16 |
| Storage drives installed |
No |
| Processor |
| Conflict-Free processor |
Yes |
| CPU configuration (max) |
1 |
| Number of processors supported |
1 |
| Processor cores |
8 |
| Processor boost frequency |
2.7 GHz |
| Processor frequency |
2.1 GHz |
| Processor model |
D-1541 |
| Processor family |
Intel® Xeon® |
| Processor manufacturer |
Intel |
| Memory |
| ECC |
Yes |
| Memory form factor |
UDIMM |
| Memory slots |
4 |
| Maximum RAM supported |
64 GB |
| Internal memory type |
DDR4 |
| Internal memory |
16 GB |
| Network |
| Wake-on-LAN ready |
Yes |
| Ethernet LAN data rate supported (max) |
10000 Mbit/s |
| Ethernet LAN |
Yes |
| Ports & interfaces |
| PCI Express x8 (Gen 3.x) slots |
2 |
| USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity |
2 |
| USB port |
Yes |
| Ethernet LAN (RJ-45) ports |
6 |
| Design |
| Built-in speaker(s) |
No |
| Built-in display |
No |
| Fan diameter |
8 cm |
| Number of fans |
3 fan(s) |
| Product colour |
Black |
| Cooling type |
Active |
| Chassis type |
Rack (3U) |
| Performance |
| On/off switch |
Yes |
| Noise level |
44.7 dB |
| Backup function |
Yes |
| Device class |
Small & Medium Business |
| Type |
Storage server |
| Power |
| AC input frequency |
50 - 60 Hz |
| AC input voltage |
100 - 240 V |
| Power consumption (HDD standby) |
62.68 W |
| Power consumption (typical) |
145.79 W |
| Redundant power supply (RPS) support |
Yes |
| Power supply unit (PSU) capacity |
800 W |
| Weight & dimensions |
| Weight |
17.4 kg |
| Height |
132.3 mm |
| Depth |
656.5 mm |
| Width |
482 mm |
| Packaging content |
| Power cables quantity |
2 |
| Processor special features |
| Embedded options available |
No |
| Enhanced Intel SpeedStep Technology |
Yes |
| Execute Disable Bit |
Yes |
| Idle States |
Yes |
| Intel 64 |
Yes |
| Intel Enhanced Halt State |
Yes |
| Intel Secure Key Technology version |
1.00 |
| Intel TSX-NI |
Yes |
| Intel TSX-NI version |
1.00 |
| Intel Trusted Execution Technology |
Yes |
| Intel VT-x with Extended Page Tables (EPT) |
Yes |
| Intel Virtualization Technology (VT-x) |
Yes |
| Intel Virtualization Technology for Directed I/O (VT-d) |
Yes |
| Operational conditions |
| Storage temperature (T-T) |
-20 - 60 °C |
| Operating relative humidity (H-H) |
5 - 95% |
| Operating temperature (T-T) |
0 - 35 °C |
| Other features |
| Certification |
FCC CE BSMI VCCI RCM EAC CCC KC UL |
