SK Hynix Unveiled ZNS SSD at OCP in San Jose

SK Hynix ZNS SSD – a New Drive for You

On Mar 25^th, 2019, the Korean chipmaker SK Hynix demoed its Zoned Name Spaces (ZNS) SSD at the Open Compute Project (OCP) Global Summit. This SSD can store different file types in different parts of the drive. This drive is expected to be shipped in the first half of the next year.

The company said that the development work on this SSD is supposed to be completed by the end of this year. It also quantified how much the emergent architecture would speed access and extend its drive’s service life.

You can image that the target market of this SSD is the data centre servers involved with AI and big data.

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SK Hynix Demoed ZNS SSD at OCP

In the early time of March, 2019, the company demoed SK Hynix ZNS SSD with open hardware folk at the Open Compute Project (OCP) Global Summit in San Jose.

In the summit, the company shown that the SK Hynix ZNS SSD can save data with similar usage and access patterns in different zones of the drive frequently. Three different data types were identified in an SK Hynix blog: music, video and images. The standard SSD can store any kind of files anywhere in the drive.

In the demo of this SK Hynix SSD, the firm supply some useful information like a potential in access speed of “up to 30 per cent” and an extension of the SSD’s service life of “over four times” compared with a “traditional SSD”. How did the Korean vendor get these numbers was not explained.

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The Technology in SK Hynix ZNS SSD

SK Hynix ZNS SSD adopts 2TB of 72-layer TLC (3 bits/cell) 3D NAND by using 512GB dies. On the other hand, it comes in an M.2 gumstick card 22110 format with an NVMe 1.2.1 interface running across a PCIe gen 3 link.

Lee Prewitt, who is a principal hardware program manager from Microsoft, also presented on ZNS at the Open Compute Project event. He pair the drive with disk drive SMR (shingled magnetic recording) and then said that both SMR and ZNS were good methods of managing large-capacity drives.

The Current Situation of ZNS

Currently, the NVMe workgroup is mulling over the ZNS technical proposal which aims to develop an industry standard for these types of interfaces. The idea is that the host system application software writes data sequentially into an open zone on the drive, and then the data can be read randomly from any zone and zones are deleted as a whole.

This technology is expected to make any write amplification due to the garbage collection process (rescuing valid data from a set of blocks about to be deleted and rewriting it elsewhere in the SSD) close to zero. This can help to extend the endurance of the drive.

Perhaps, other data storage drive producers will also be interested in this schedule and they may ship the ZNS efforts in the near feature.