Securing your business assetsN/AThe 16-bay RS4021xs+ provides solid data security and lightening-fast performance with over 234K 4K random read IOPS and 6258 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.N/AN/AEngineered for service continuityN/AThe RS4021xs+ ensures mission-critical data is always available enabling businesses to deliver the best results even in the face of disaster.N/AN/ARedundant powerN/ADual PSUs provide protection against a PSU failure or accidental cord removal while hot-swappable fans can be replaced without powering down the system.N/AN/AMaximize service availabilityN/ASynology High Availability (SHA) pairs two identical units together creating an active-passive cluster with minute-level failover.N/AN/ANext-generation file systemN/ABtrfs prevents data corruption and reduces maintenance overheads with advanced storage technologies and optimized snapshotsN/AN/ACustomize to your businessN/AThe RS4021xs+ includes two PCIe slots for performance networking and storage upgrades enabling it to adapt to any business environment2.N/AN/ADouble bandwidthN/AUpgrade network bandwidth in minutes by 2x or more with Synologys range of 10GbE NICs.N/AN/ASSD cache3N/ABoost 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.N/AN/AStorage expansionN/AQuickly and easily scale up to 40 drives with two RX1217(RP) expansion units.N/AN/AHyper BackupN/AA 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. N/AN/ASnapshot ReplicationN/AEasily 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. N/AN/AStorage for virtualizationN/ASynology 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 environmentsN/AN/AAll-in-one surveillance solutionN/ASynology 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.N/AN/ASecure and privateN/AAES-256 encryption keeps locally-stored footage secure.N/AN/AAccess from anywhere anytimeN/AAccess recordings and live streams whenever you want using a web browser desktop client or the DS cam mobile app.N/AN/AReal-time alertsN/AEmail SMS or push notifications alert you when incidents occur or predefined conditions are met.