Samsung Unveils ZNS SSD: QLC V-NAND for Datacenter-Grade Endurance & Performance

Samsung has introduced its first Zones Namespaces (ZNS) solid-state drives that combine high performance, long endurance, relatively low price enabled by the company’s QLC V-NAND, and improved quality of service (QoS) for datacenters. To use Samsung’s new PM1731a ZNS SSDs, datacenters will have to deploy new storage systems and software. 

ZNS SSDs work differently than conventional block-based drives and have a number of advantages. ZNS SSDs write data sequentially into large zones and have better control over write amplification, which reduces over-provisioning requirements by an order of magnitude. For example, some enterprise drives rated for 3 DWPD (drive writes per day) reserve about a third of their raw capacity for over-provisioning, but for ZNS SSDs about 10% of that is enough. In addition, since ZNS uses large zones instead of many 4KB blocks, garbage collection is not needed as often as traditional SSDs, it also improves real-world read and write performance. 

Samsung’s 2.5-inch PM1731a ZNS SSDs are based on the company’s proprietary dual-port controller as well as 6th Generation QLC V-NAND memory. The drives will be available in 2TB and 4TB capacities.

(Image credit: Samsung)

Samsung says that its new PM1731a ZNS drives will last up to four times longer than conventional NVMe SSDs, which will reduce their total cost of ownership (TCO) and will simplify server infrastructure. 

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