Synology RackStation RS4021XS+ NAS/storage server Rack (3U) Ethernet LAN Black D-1541

Securing your business assetsThe 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 continuityThe RS4021xs+ ensures mission-critical data is always available, enabling businesses to deliver the best results, even in the face of disaster.Redundant powerDual 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 availabilitySynology High Availability (SHA) pairs two identical units together creating an active-passive cluster with minute-level failover.Next-generation file systemBtrfs prevents data corruption and reduces maintenance overheads with advanced storage technologies and optimized snapshotsCustomize to your businessThe RS4021xs+ includes two PCIe slots for performance, networking, and storage upgrades enabling it to adapt to any business environment2.Double bandwidthUpgrade network bandwidth in minutes by 2x or more with Synology s range of 10GbE NICs.SSD cache3Boost 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 expansionQuickly and easily scale up to 40 drives with two RX1217(RP) expansion units.Hyper BackupA 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 ReplicationEasily 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 virtualizationSynology 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 environmentsAll-in-one surveillance solutionSynology 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 privateAES-256 encryption keeps locally-stored footage secure.Access from anywhere, anytimeAccess recordings and live streams whenever you want using a web browser, desktop client, or the DS cam mobile app.Real-time alertsEmail, SMS, or push notifications alert you when incidents occur or predefined conditions are met.

Storage
Storage drives installed:
Number of storage drives supported:	16
Installed storage drive type:
Supported storage drive types:	HDD & SSD
Storage drive interface:	Serial ATA II, Serial ATA III
RAID support:
Storage drive sizes supported:	2.5,3.5"
RAID levels:	5, 6
Processor
Processor family:	Intel® Xeon®
Processor manufacturer:	Intel
Processor model:	D-1541
Processor frequency:	2.1 GHz
Processor boost frequency:	2.7 GHz
Processor cores:	8
CPU configuration (max):	1
Number of processors supported:	1
Conflict-Free processor:
Memory
Internal memory:	16 GB
Internal memory type:	DDR4
Maximum RAM supported:	64 GB
Memory slots:	4
Memory form factor:	UDIMM
ECC:
Network
Ethernet LAN:
Ethernet LAN data rate supported (max):	10000 Mbit/s
Wake-on-LAN ready:
Ports & interfaces
Ethernet LAN (RJ-45) ports:	6
USB port:
USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity:	2
PCI Express x8 (Gen 3.x) slots:	2
Design
Chassis type:	Rack (3U)
Cooling type:	Active
Product colour:	Black
Number of fans:	3 fan(s)
Fan diameter:	8 cm
Built-in display:
Built-in speaker(s):
Performance
Type:	Storage server
Device class:	Small & Medium Business
Backup function:
Noise level:	44.7 dB
On/off switch:
Power
Power supply unit (PSU) capacity:	800 W
Redundant power supply (RPS) support:
Power consumption (typical):	145.79 W
Power consumption (HDD standby):	62.68 W
AC input voltage:	100 - 240 V
AC input frequency:	50 - 60 Hz
Weight & dimensions
Width:	482 mm
Depth:	656.5 mm
Height:	132.3 mm
Weight:	17.4 kg
Packaging content
Power cables quantity:	2
Processor special features
Embedded options available:
Enhanced Intel SpeedStep Technology:
Execute Disable Bit:
Idle States:
Intel 64:
Intel Enhanced Halt State:
Intel Secure Key Technology version:	1.00
Intel Trusted Execution Technology:
Intel TSX-NI:
Intel TSX-NI version:	1.00
Intel Virtualization Technology (VT-x):
Intel Virtualization Technology for Directed I/O (VT-d):
Intel VT-x with Extended Page Tables (EPT):
Operational conditions
Operating temperature (T-T):	0 - 35 °C
Operating relative humidity (H-H):	5 - 95%
Storage temperature (T-T):	-20 - 60 °C
Certificates
Certification:	FCC CE BSMI VCCI RCM EAC CCC KC UL
Logistics data
Harmonized System (HS) code:	84714100