Best Failover

Synology 4 Bay NAS Rackstation RS819 (Diskless)

Scalable 4-bay 1U rack mount NAS for business workgroups.
scale up to 8 drives with Synology RX418.
encryption performance at over 224 MB/s reading, 152 MB/s writing.
Compact chassis design, Less than 12-inch deep.
Dual 1GbE LAN with failover and Link Aggregation support.
Advanced Btrfs file system offering 4, 096 system-wide snapshots and 256 snapshots per shared folder.

Refer the user manual below for troubleshooting.
Up to 50 IPsec tunnels (for site-to-site and client-to-site VPN) and 5 OpenVPN tunnels for iOS and Android users.
900 Mbps firewall and 110 Mbps IPsec throughputs.
Feature-rich to meet a wide range of business network requirements.
Supports load balancing and WAN failover for highly reliable Internet connectivity.

Tackle multi-user environments effortlessly with up to 2,315 MB/s read and 1,147 MB/s write performance.
The RS1221+ and RS1221RP+ feature a short depth of just 298 mm and 399 mm respectively.
Improve network performance by 5X with a PCIe SFP+ or RJ-45 network card from the compatibility list.
Configure two units together to create a Synology High Availability (SHA) cluster for maximum service uptime and minute-level failover.

Content URL filter, port mapping, virtual IP mapping, IP-MAC binding.
- Data Security, OPENVPN protocols, Supports CA digital certificate..
High Reliability & Efficient Remote management: Watchdog and multi-layer link detection mechanisms ,automatic redial and recovery.
Failover between wired, cellular LTE networks and Wi-Fi. With InHand Device Manager cloud platform. Offers 3 years warranty and free technical support. If you are not sure about the product details , please feel free to consult.

Comprehensive codec support, Caller ID, flexible dial plans and security protection.
Designed and tested for full interoperability with leading ip-pbxs, soft-switches and sip-based environments.
Failover SIP server feature in case Main SIP server goes down.

Refer the user manual below for troubleshooting.
Up to 50 IPsec tunnels (for site-to-site and client-to-site VPN) and five OpenVPN tunnels for iOS and Android users.
900 Mbps firewall and 110 Mbps IPsec throughputs.
Feature-rich to meet a wide range of business network requirements.
Supports load balancing and WAN failover for highly reliable Internet connectivity.

Featured dual 1GbE LAN ports to support network failover, and with Link Aggregation enabled, DS220+ provides over 225 MB/s sequential read and 192....
Intel dual-core processor with AES-NI hardware encryption engine.
2 GB DDR4 memory (expandable up to 6 GB).
Access, share, and sync your data easily across different operating systems and devices..
Average 15% performance boost to photo indexing and other computing-intensive operations, as well as database response time..
By default, two camera licenses are installed.
extra licenses can be purchased (CLP1, CLP4, or CLP8).

LTE-Advanced performance at 2G power consumption – uses less than 1 watt.
Ideal for solar-powered applications - Ruggedized, industrial grade form factor.
4G LTE Bands: 2100(B1), 1900(B2), 1800(B3), AWS(B4), 850(B5), 2600(B7), 900(B8), 700(B12), 700(B13), 800(B20), 1900(B25), 850(B26), 700(B29), TDD B41....
Enables edge computing applications with ALEOS Application Framework (AAF).
Remote, secure network management in the cloud or in the enterprise - Dual-SIM functionality to enable automatic failover between SIMs....

Sequential throughput performance at over 226 MB/s reading and 170 MB/s writing.
Dual 1GbE ports with failover and Link Aggregation support.
4K 10-bit H.265 video transcoding on the fly.
Over 40TB raw single volume capacity. Compatible Drive Type-3.5 inch SATA HDD, 2.5 inch SATA HDD, 2.5 inch SATA SSD. "Compatible drive type" indicates drives that have been tested to be compatible with Synology products. This term does not indicate the maximum connection speed of each drive bay.