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14 Next-Generation Hyperconverged Infrastructure For Dummies, Nutanix Special Edition These materials are © 2020 John Wiley & Sons, Inc. Any dissemination, distribution, or unauthorized use is strictly prohibited. Identifying performance, resilience, and scalability features Within HCI, each node participates as a part of a cluster of nodes providing both storage capacity and resiliency. All the software-based storage management constructs — including dataprotection —aredistributedacrossthecluster. System resilience and overall performance increase in a Nutanix next-generation HCI as the cluster scales out, with data protec- tion functions that include: » Tunable redundancy: This feature replaces traditional hardware-centric redundant array of independent disks (RAID) storage technology, providing continuous data availability for applications by automatically reading from other nodes in the cluster in the event of a drive or node failure. » Erasure coding technology: Nutanix EC-X provides resilience and increases usable capacity by up to 75 percent by using tunable redundancy for hot data and erasure coding for cold data. » Integrity checks: Various features proactively identify and fix issues related to data consistency and integrity, bit rot failures, and hard disk corruption. » Availability domains: These allow a Nutanix cluster to survive the failure of a node or block with intelligent data placement (also known as "node awareness") combined with tunable redundancy to ensure that a cluster can tolerate a node failure without losing access to any of its data. Traditional approaches to HCI often use scale-up technologies that havehardlimitsorintroducesinglepointsoffailureinthe stack. The scale-out capabilities in Nutanix next-generation HCI simplifytheabilitytoaddcapacityondemand.That'sone ofthemostsignificantbenefitsofthetechnology.Figure 2-1 illustrates the linear scale-out performance in a Nutanix next- generation HCI.