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[Anandtech.com] Viking Ships UHC-Silo SSDs: 25 ?? 50 TB Capacity, Custom eMLC, SAS, $0.4 per GB - i4memory.com - different look at memory

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Old 16-07-2017, 11:00 AM   #1
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[Anandtech.com] Viking Ships UHC-Silo SSDs: 25 ?? 50 TB Capacity, Custom eMLC, SAS, $0.4 per GB



Viking Technology has started shipping their new lineup of ultra high capacity (UHC) SSDs designed to replace 3.5” HDDs in capacity-demanding applications that can take advantage of flash memory. The Viking UHC-Silo drives use planar eMLC NAND memory in custom packaging with raw NAND capacities of 25 TB and 50 TB, and consequently are currently the highest capacity SSDs available on the market.

An increasing number of datacenters these days use both SSDs and HDDs, balancing the high performance of SSDs with HDDs' ability to store huge amounts of data relatively cheaply. Meanwhile, there is an emerging category of all-flash or hybrid storage systems that either do not use hard drives at all, or use HDDs mostly for things like “cold” archives. Such systems are rather energy efficient and offer high performance thanks to the heavy use of solid state storage.

Nevertheless, when it comes to bulk storage, their requirements are similar to the requirements of datacenters using HDDs: maximum capacity per cubic meter, maximum capacity per watt, high availability, and predictable cost per GB. Viking’s UHC-Silo SSDs were designed for the aforementioned kinds of applications — in some cases, they are going to replace hard drives for huge databases or even “cold” storage, in other cases they are going to sit between “warm” and “cold” storage. Given that many applications may benefit from SSDs, demand for high-capacity flash storage devices is growing in general.

The Viking UHC-Silo SSDs come in a 3.5” form-factor (a rarity for any kind of SSD) and utilize a SAS 6 Gbps interface, two features that make the drives particularly well-suited for replacing high capacity HDDs. The drives are designed for mixed workloads that do not generate more than 1 DPWD and do not require very high performance. The UHC-Silo SSDs offer sustained sequential read/write speed of 500/350 MB/s as well as up to 60,000/15,000 random read/write IOPS, which is in line with other extreme capacity SATA SSDs and is a result of their internal architecture and limitations of contemporary controllers. In fact, given the UHC-Silo's performance limitations (350 MB/s sustained write speed), it's impossible to write more than 30 TB of data in a single day. So while the 25 GB version can physically support 1 DPWD over five years (this is what Viking guarantees), the 50 TB model cannot physically support more than 0.6 DPWD. The latter fact essentially means that, assuming Viking's sustained performance figures are reasonably accurate, the TBW rating of the 50 TB SKU (91.25 PB) cannot be physically exceeded during the warranty period.

Viking UHC-Silo Specifications 25 TB 50 TB Form Factor 3.5" SAS Drive Interface SAS 6 Gbps Controller Proprietary NAND SK Hynix eMLC in proprietary packaging Sequential Read 500 MB/s Sequential Write 350 MB/s Random Read (4 KB) IOPS 60,000 Random Write (4 KB) IOPS 10,000 Power Idle 10 W Operating 16 W ECC 55 bit/512 byte BCH Endurance Up to 1 DWPD for over five years (limited by performance) Uncorrectable Bit Error Rate
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