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

Samsung
(Image credit: Samsung)

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 TLC 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 TLC 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. Subsequent generations of Samsung’s ZNS SSDs will use the company’s TLC V-NAND memory that is projected to provide enterprise-grade endurance with ZNS

But enhanced endurance and performance come at a cost. ZNS ecosystem requires new software infrastructure that is not yet widely available. In a bid to make ZNS more widespread, Samsung is participating in a number of open-source ZNS projects. The manufacturer also plans to make its ZNS technology available to xNVMe and participate in the Storage Performance Development Kit (SPDK) community to enable NVMe and SPDK users to implement ZNS more easily. 

Samsung will start mass production of its PM1731a ZNS SSDs in the second half of the year.  The company is the second major maker of SSDs, the first being Western Digital, to unveil a ZNS SSD. 

"Samsung's ZNS SSD reflects our commitment to introducing differentiated storage solutions that can substantially enhance the reliability and lifetime of server SSDs," said Sangyeun Cho, senior vice president of the Memory Software Development Team at Samsung Electronics. "We plan to leverage quad-level cell (QLC) NAND technology in our next-generation ZNS drives to enable higher thresholds for storage performance and capacity in the enterprise systems of tomorrow."

  • kal326
    Seeing this I started to look around at what ZNS is and found a presentation from someone at WD from mid last year. Interesting that these are already coming to market having been added to the NVME standards. Further interesting in how they sequential right zoned SSDs like these can also play nice with SMR hard drives in the same file systems.
    So for better or worse it seems there will be larger SMR “data center” drives in the future.

    The whole process isn’t nearly the same as I was thinking to how Nimble does their all flash array writes. They use a cache controller or pairs of them to absorb the host writes that then get pushed out to traditional SSDs in sequential writes to reduce write amplification. ZNS the OS/File system talks to the drives and determines what has what blocks available for a write operation and finds the best place for it. Also at least for WD they can convert existing NVME drives to zone ones with just different firmware. Or so they said in their presentation.
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