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Synology RS4021xs+

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Last updated: 2024-11-27 19:45 [Links below are Amazon affiliate links]

	Synology 16 bay RackStation RS4021xs+ (Diskless) 🛈	5399.990 USD
	Synology RackStation RS4021xs+ NAS Server with Xeon 2.1GHz CPU, 64GB Memory, 32TB HDD Storage, 🛈	8999.000 USD
	Synology RackStation RS4021xs+ NAS Server with Xeon 2.1GHz CPU, 64GB Memory, 16TB SSD Storage, 🛈	10099.000 USD
	Synology RackStation RS4021xs+ NAS Server with Xeon 2.1GHz CPU, 64GB Memory, 64TB SSD Storage, 🛈	11999.000 USD
	Synology RackStation RS4021xs+ NAS Server with Xeon 2.1GHz CPU, 64GB Memory, 32TB SSD Storage, 🛈	12199.000 USD
	Synology RackStation RS4021xs+ NAS Server with Xeon 2.1GHz CPU, 64GB Memory, 64TB SSD Storage, 🛈	12639.000 USD
	Synology RackStation RS4021xs+ NAS Server with Xeon 2.1GHz CPU, 64GB Memory, 320TB HDD Storage, 🛈	16989.000 USD

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PERFORMANCE:

Specs	Measure	RS4021xs+
10GbE iSCSI Random IOPS 4KB	Read IOPS/Write IOPS	289854 / 146487
1GbE Web Server PHP Response Efficiency	Responses per second	116633
Aggregated 10GbE SMB Random IOPS 4KB	Write IOPS/Read IOPS	153385 / 234698
Aggregated 10GbE SMB Sequential Throughput 64KB	Read MBs/Write MBs	6259 / 3135
Aggregated 10GbE SMB Sequential Throughput via Encrypted Shared Folder 64KB	Write MBs/Read MBs	2149 / 4144
Specs	RS4021xs+

Specification:

Specs	Value
CPU-Model	Intel Xeon D-1541
CPU Architecture	64-bit
CPU Frequency	8-core 2.1 (base) / 2.7 (turbo) GHz
Hardware Encryption Engine (AES-NI)
System-memory	16 GB DDR4 ECC UDIMM
Memory Module Pre-installed	16 GB (16 GB x 1)
Total Memory Slots	4
Maximum Memory Capacity	64 GB (16 GB x 4)
Notes	The specifications vary depending on system configuration and memory size.
Drive Bays	16
Maximum Drive Bays with Expansion Unit	40 (RX1217/RX1217RP x 2)
Maximum Single Volume Size*	200 TB (32 GB RAM required, for RAID 5 or RAID 6 groups only) 108 TB
Hot Swappable Drive
RJ-45 1GbE LAN Port	4 (with Link Aggregation / Failover support)
RJ-45 10GbE LAN Port	2 (with Link Aggregation / Failover support)
USB 3.2 Gen 1 Port*	2
Expansion Port	2
PCIe Expansion	2 x Gen3 x8 slots (x8 link)
Internal Drives	Btrfs EXT4
External Drives	Btrfs EXT4 EXT3 FAT NTFS HFS+ exFAT*
Form-Factor	3U
Size (Height x Width x Depth)	132.3 mm x 482 mm x 656.5 mm
Weight	17.4 kg
Rack Installation Support*	4-post 19" rack (Synology Rail Kit - RKS1317)
System Fan	80 mm x 80 mm x 3 pcs
Fan Speed Mode	Full-Speed Mode Cool Mode Quiet Mode
Easy Replacement System Fan
Power Recovery
Noise Level*	44.7 dB(A)
Scheduled Power On / Off
Wake on LAN / WAN
Power Supply Unit / Adapter	800 W
Redundant Power Supply
AC Input Power Voltage	100 V to 240 V AC
Power Frequency	50/60 Hz, Single Phase
Power-Consumption	145.79 W (Access) 62.68 W (HDD Hibernation)
British Thermal Unit	497.14 BTU/hr (Access) 213.74 BTU/hr (HDD Hibernation)
Operating Temperature	0°C to 35°C (32°F to 95°F)
Storage Temperature	-20°C to 60°C (-5°F to 140°F)
Relative Humidity	5% to 95% RH
Certification	FCC CE BSMI VCCI RCM EAC CCC KC UL
Warranty	5 Years
Environment	RoHS Compliant
Packaging Content	Main Unit X 1 Accessory Pack X 1 AC Power Cord X 2 Quick Installation Guide X 1
Optional Accessories	DDR4 ECC UDIMM: D4EC-2666-16G Expansion Units: RX1217/RX1217RP 3.5" SATA HDD: HAT5300 2.5" SATA SSD: SAT5200 M.2 SSD & 10GbE Combo Adapter Card: E10M20-T1 M.2 SSD Adapter Card: M2D20 10GbE Network Interface Card: E10G18-T2/E10G18-T1/E10G17-F2 Rail Kit Sliding: RKS1317 VisualStation: VS960HD/VS360HD Surveillance Device License Pack
Maximum Internal Volume Number	256
SSD Read / Write Cache (White Paper)
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
File Protocol	CIFS/AFP/NFS/FTP/WebDAV
Maximum Concurrent CIFS/AFP/FTP Connections	4,000
Windows Access Control List (ACL) Integration
NFS Kerberos Authentication
Maximum Local User Accounts	16,000
Maximum Local Groups	512
Maximum Shared Folder	512
Maximum Shared Folder Sync Tasks	32
Synology High Availability
Log Center
Syslog Events per Second	3,000
VMware vSphere with VAAI
Windows Server 2016
Windows Server 2019
Citrix Ready
OpenStack
Networking Protocols	SMB1 (CIFS), SMB2, SMB3, NFSv3, NFSv4, NFSv4.1, NFS Kerberized sessions, iSCSI, HTTP, HTTPs, FTP, SNMP, LDAP, CalDAV
Supported Browsers	Google Chrome Firefox Microsoft Edge Internet Explorer 10 onwards Safari 10 onwards Safari (iOS 10 onwards) Google Chrome (Android 6.0 onwards)
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
Antivirus by McAfee (Trial)
Central Management System
Synology Chat
Maximum Users	3,000
Document Viewer
Download Station
Maximum Concurrent Download Tasks	80
exFAT Access (Optional)
Maximum iSCSI Target Number	256
Maximum iSCSI LUN	512
iSCSI LUN Clone/Snapshot, Windows ODX
Synology MailPlus / MailPlus Server
Free Email Accounts	5 (Licenses required for additional accounts)
Maximum Number of Concurrent Users	1,100
Maximum Server Performance	4,312,000 emails per day, approx. 131GB
Media Server
DLNA Compliance
Moments
Facial Recognition
Subject Recognition
Auto Color & Rotate
Moments Select
Snapshot Replication
Maximum Snapshots per Shared Folder	1,024
Maximum of System Snapshots	65,536
Surveillance Station
Maximum IP cam (Licenses required)	90 (including 2 Free License) (See All Supported IP Cameras)
Total FPS (H.264)	2700 FPS @ 720p (1280x720) 2250 FPS @ 1080p (1920x1080) 1500 FPS @ 3M (2048x1536) 900 FPS @ 5M (2591x1944) 550 FPS @ 4K (3840x2160)
Total FPS (H.265)	2700 FPS @ 720p (1280x720) 2700 FPS @ 1080p (1920x1080) 2250 FPS @ 3M (2048x1536) 1500 FPS @ 5M (2591x1944) 1080 FPS @ 4K (3840x2160)
Synology Drive
Recommended Number of Hosted Files	5,000,000 (applies to files indexed or hosted by Synology Drive. For file access through other standard protocols, refer to the File Services section above)
Recommended Number of Concurrent Sync Clients	2,000 (the number of connections that can be maintained when the recommended number of hosted files was reached)
Synology Office
Video Station
Virtual Machine Manager
Recommended Virtual Machine Instances	16 (Learn more)
VPN Server
Maximum Connections	40
Specs	Value

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