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Western Digital launches 15 TB enterprise SAS SSD

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发表时间:2018-08-24 09:50

Western Digital's 15 TBUltrastar SAS SSD has twice the capacity of its previous version, but only halfof the capacity of Toshiba's 31 TB whopper.


Ultrafast,NVMe-based PCI Express solid-state drives may represent the future ofenterprise storage technology,...

but drive vendors still see a future inSAS SSDs.

Western Digital this week said itis shipping samples of its highest-density enterprise SAS SSD to OEMs. The new2.5-inch Ultrastar DC SS530 can store up to 15.36 TB, doubling the capacityover the prior SS300 model,thanks to denser 64-layer 3D NAND flash thatcan help lower costs. The SS530 is due to be production-ready at the end ofthis quarter.

"There's a lot of excitement aroundNVMe [nonvolatile memory express]. But SAS is still a very trusted, reliableinterface. It's an interface that lets you mix HDDs and SSDs," said EddieRamirez, senior director of product management for enterprise SSDs at WesternDigital, based in San Jose, Calif.

SAS SSD demand remains strong inenterprise storage arrays, and on the server side, growth is coming fromhyper-converged infrastructure that combines compute, storage andvirtualization resources in the same box, Ramirez said. SAS SSDs might serve asthe caching layer in front of SAS HDDs, he added.

"For thingslike hyper-converged infrastructure systems, it's still a veryeffective interface, particularly if you want to do hybrid arrays where you'reusing both SSDs and HDDs within the same server," he said.

The Ultrastar DC SS530 enterprise SASSSD uses 64-layer 3D NAND flash that stores 3 bits of data per cell,known as triple-level cell (TLC). The prior model, SS300, used 32-layer 3DNAND, with TLC in a lower-endurance model and multi-level cell flash that stores2 bits of data per cell in the higher-endurance options.

Ramirez said Western Digital can use TLCfor all of its one-drive, three-drive and 10-drive writes per day (DWPD) SKUs.The one DWPD model targets read-intensiveworkloads, and the higher-enduranceoptions are designed for caching and write-intensive workloads.

New SAS SSD boosts performance

Western Digital and Intel jointlydeveloped the Ultrastar DC SS530. It improves random write performance by 60%over the prior model, delivering up to 320,000 IOPS in the 10 DWPD SKU. Randomread performance is up by 10% to a maximum of 440,000 IOPS.

The new enterprise SAS SSD supports a data transfer rateof 12 Gbps. Western Digital's roadmap calls for 24 Gbps enterpriseSAS SSDs, but Ramirez declined to disclose the timetable.

Samsung's 31 TB SAS SSD

The Ultrastar DC SS530 is WesternDigital's first SSD with a higher capacity than any of its HDDs. The company'shighest-capacity enterprise HDD is 14 TB. The SS530 is available atcapacities ranging from 400 GB to 15.36 TB. But Samsung has Western Digitalbeat for capacity with its 30.72 TB SAS drive that uses 64-layer TLC3D NAND flash, which the vendor calls V-NAND.

Ramirez said Western Digital will consider a 31 TB drivein its next-generation product, but "we don't quite see the marketadoption at that high a capacity at this point."

Western Digital's new Ultrastar DC SS530 enterprise SASSSD is dual-ported, in contrast to the single-ported 12 Gbps SAS SSD thatrival Toshiba introduced in June. Toshiba's RM5 SAS SSD is designed as aSATA replacement and targets server-based applications, includingsoftware-defined storage and hyper-converged infrastructure. Toshiba claimedthe single-port SAS SSD is close in price to SATA SSDs, which max out at 6 Gbpsand are typically less expensive than SATA SSDs.

The Western Digital Ultrastar DC SS530 SSD can run insingle-port mode, but dual-port SSDs provide redundancy and a performanceboost, in some cases, Ramirez said.

"Currently, we feel the marketin SAS is still very much looking at dual-portedcapability," Ramirez said. "Typically, in a SAS storage array, you'reusing an HBA [host bus adapter] to talk to multiple drives, and you don't wantthat HBA to be a single point of failure."

Ramirez declined to disclose pricing for the SS530 otherthan to say there's no difference in the cost per gigabyte in comparison to theprior SS300 model.

Enterprise SAS SSD market

Western Digital is third in theenterprise SAS market, behind Samsung and Toshiba in units and exabytesshipped, according to storage research firm Trendfocus.

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