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[] Intel Introduces Optane SSD DC P4800X With 3D XPoint Memory - - different look at memory


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Old 20-03-2017, 03:42 AM   #1
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[] Intel Introduces Optane SSD DC P4800X With 3D XPoint Memory

A year and a half after first publicly unveiling their new 3D XPoint non-volatile memory technology, Intel is launching the first product incorporating the new memory. The Intel Optane SSD DC P4800X is an enterprise PCIe 3 x4 NVMe SSD that Intel promises will be the the most responsive data center SSD with lower latency than all of the fastest NAND flash based competitors. After months of touting 3D XPoint memory primarily with rough order of magnitude claims about its performance, endurance and cost relative to DRAM and NAND flash, and after some unexplained delays, Intel is finally providing some concrete specifications and pricing for a complete SSD that is shipping today. The information is more limited than we're accustomed to for their NAND flash SSDs, and Intel still isn't confirming anything about the materials or exact operating principle of the 3D XPoint memory cell.

Current computer system architectures are based around the use of DRAM as working memory and NAND flash for fast storage. 3D XPoint memory falls between the two technologies on most important metrics, so Optane SSDs bring a new dimension of complication to a server architect's task. For most enterprise use cases, the most enticing feature of Optane SSDs over NAND SSDs is the former's higher performance, especially reduced latencies. Aside from the gains from switching to the NVMe protocol, the latency offered by NAND flash based SSDs has been mostly stagnant or even regressed with the disappearance of SLC NAND from the market, even as throughput and capacity have grown with every generation.

The Intel Optane SSD DC P4800X is rated for a typical read or write latency under 10µs, compared to tens of microseconds for the best NAND flash based SSDs, and about 4µs minimum imposed by PCIe and NVMe transaction overhead. More impressive is how little latency degrades under less than ideal conditions. Queue depth 1 random reads are rated to remain below 30µs even while the drive is simultaneously accepting 2GB/s of sustained random writes (about 500k IOPS). Intel even specifies Quality of Service (QoS) standards for latency at the 99.999th percentile, with even QD16 random writes staying almost entirely below 200µs. A consequence of the low latency is that the P4800X can deliver full throughput at lower queue depths: the P4800X is rated to deliver maximum IOPS at QD16 while flash-based SSDs are specified for queue depths of at least 32. Unlike flash memory, the read and write performance of 3D XPoint memory is roughly equal, and this is reflected in Intel's specifications for the P4800X.

Conspicuously missing from the performance specifications are sequential throughput. The P4800X can already use more than half of the available PCIe bandwidth with a completely random I/O workload. Rather than reassure us that the P4800X can do even better with larger transfer sizes, Intel suggests that being overly concerned with the sequential transfer speeds is a sign that you should be shopping for their 3D NAND SSDs instead. They'll offer plenty of throughput for a far lower price.

Intel's 3D XPoint memory is being manufactured as a 128Gb (16GB) die, slightly behind the trend for NAND flash capacities. As a result, the Optane SSD DC P4800X will start with a 375GB model and later this year be followed by 750GB and 1.5TB models. The top-performing enterprise SSDs currently tend to be multi-TB drives. Intel has shared very few details about the new controller they've developed for the P4800X, but they have disclosed that the 375GB model uses seven channels with four dies per channel, for a total of 28 chips and a raw capacity of 448GB. Fourteen packages of 3D XPoint memory are visible on the back side of the drive in the photographs Intel has released, suggesting that fourteen more packages are hiding under the heatsink and that the 375GB add-in card model is using single-die packages. The controller implements a high-performance all-hardware read path that does not involve the drive's firmware, and while the exact stride of memory accesses is not known, a single 4k read will be spread across all seven channels.

3D XPoint memory can be read or written with byte granularity and modifications can be written in place, so it is free from the worst internal fragmentation and write amplification challenges that are caused by the large page sizes and huge erase block sizes of NAND flash. This means that further overprovisioning beyond the drive's native amount will have minimal impact on performance and that the performance of a full drive should not suffer severely the way flash based SSDs do. However, some amount of spare area is still required for error correction and other metadata and for a pool of spare blocks. The write endurance of 3D XPoint memory is not infinite so wear leveling is still required, but it is a much simpler process that requires much less spare area.

The Intel Optane SSD DC P4800X has a write endurance rating of 30 Drive Writes Per Day, and Intel is hopeful that future products can offer even higher ratings once 3D XPoint memory has more broadly proven its reliability. Today's limited release 375GB models have a three year warranty for a total write endurance rating of 12.3 PB, and once the product line is expanded to broad availability of the full range of capacities in the second half of this year the warranty period will be five years.

Intel is offering the 375GB P4800X in PCIe add-in card form factor with a MSRP of $1520 starting today with a limited early-ship program. In Q2 a 375GB U.2 model will ship, as well as a 750GB add-in card. In the second half of the year the rest of the capacity and form factor options will be available, but prices and exact release dates for those models have not been announced. At just over $4/GB the P4800X seems to fall much closer to DRAM than NAND in price, though to be fair the enterprise SSDs it will compete against are all well over $1/GB and the largest DDR4 DIMMs are around $10/GB.

Intel Optane SSD DC P4800X Specifications Capacity 375 GB 750 GB 1.5 TB Form Factor PCIe HHHL or 2.5" 15mm U.2 Interface PCIe 3.0 x4 NVMe Controller Intel unnamed Memory 128Gb 20nm Intel 3D XPoint Typical Latency (R/W)
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