FIVE PERVASIVE FLASH-BASED STORAGE MYTHS
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1 E-Guide FIVE PERVASIVE FLASH-BASED STORAGE MYTHS SearchSolidState Storage
2 F lash has rapidly moved from a niche storage product that was used to differentiate storage vendors to a ubiquitous technology. The majority of success around flash storage has come from the need -- or perceived need -- for speed by mission-critical applications. This e-guide highlights the five most pervasive myths about flash-based storage with an added dose of reality. PAGE 2 OF 9
3 FIVE PERVASIVE FLASH-BASED STORAGE MYTHS Marc Staimer Flash has rapidly moved from a niche storage product that was used to differentiate storage vendors to a ubiquitous technology. The majority of success around flash storage has come from the need -- or perceived need -- for speed by mission-critical applications. Here is a list of the five most pervasive myths about flash-based storage with an added dose of reality. MYTH 1: HYBRID OR ALL-FLASH ARRAYS SOLVE ALL STORAGE-BASED PERFOR- MANCE PROBLEMS Hybrid and all-flash arrays are all the rage in the data storage industry. For example, flash-based storage adds hundreds of thousands to millions of potential IOPS plus huge gains in throughput. But do these arrays solve all storage-based performance problems? No. The issue is latency. Putting all those high-performance flash solid-state drives (SSDs) inside the storage array increases the latency between the storage controller and the drive media, typically by multiple orders of magnitude. PAGE 3 OF 9
4 But it does nothing for the latency between the application server (physical or virtual) and the storage array. This is the latency of the data packets going from server memory and over the storage bridge to the PCI Express (PCIe) controller, Fibre Channel/Ethernet/InfiniBand adapter, transceiver, cable, transceiver, switch/multiple switches, cable, storage adapter, PCIe bus, PCIe controller, bridge, memory and CPU, and then back over the bridge to the PCIe controller, PCIe bus, SAS controller, transceiver, cable, transceiver, SSD controller and so on. That's a lot of latency that flash SSD performance is unable to improve. Additionally, flash SSDs can be constrained by the performance limitations of the storage controller. When the lowest possible latency is essential to application performance (high-frequency trading, simulations, media and entertainment, flow analysis, modeling, 3-D CAD/CAM), flash SSD performance is best served directly from the application server's DIMM slots or PCIe slots. This eliminates the vast majority of the latency. MYTH 2: FLASH DRIVES IN ARRAYS ARE MORE ENTERPRISE-READY THAN THOSE IN SERVERS Like most myths, this one contains a grain of truth and a bit of exaggeration. PAGE 4 OF 9
5 Array vendors test, burn-in and certify that all the drives in their arrays reduce drive failures, maintenance costs, downtime and lost data -- which is a very good thing. But flash SSDs and hard disk drives (HDDs) are quite different. Burning-in HDDs allows vendors to remove bad HDDs before they go out the door. But burning-in SSDs typically only provides the limited benefit of causing SSD performance to drop to the steady state sooner. The other claim is from array-based error correcting code that goes beyond that provided by the SSD. Technically, there is a slight advantage to users when SSDs are embedded in an external array. But are these two items enough to claim that SSDs in a hybrid or all-flash array are more enterprise-ready than those embedded in servers? That's a subjective decision not necessarily related to the facts. MYTH 3: SSDS COST A LOT MORE THAN HDDS This perception has been around since the first SSDs hit the market, and it depends on several factors. First, it is based primarily on acquisition costs. Flashbased storage costs are dropping quickly, while the price of HDDs is falling much more slowly. As NAND flash manufacturers made NAND chips smaller and smaller following the Moore's law curve, acquisition price per gigabyte (GB) plummeted. As flash SSD manufacturers harden enterprise multi-level PAGE 5 OF 9
6 cell and MLC NAND chips with better ECC and wear-leveling, price per GB has decreased even further. And as 3-D NAND makes its way into flash SSDs, acquisition costs will again drop dramatically per GB. What does this mean when comparing SSDs to HDDs? High-performance 15,000 rpm and even 10,000 rpm HDDs are going away. Acquisition costs have become comparable while operating costs are definitively lower for SSDs. IBM recently determined that SSDs have an 11% lower acquisition cost than equivalent high-performance HDDs and a 28% lower total cost of ownership (TCO). Even as SSDs have relegated higher-performance HDDs to an increasingly smaller market share, large-capacity, lower performance 7,200 rpm HDDs have become increasingly popular for secondary storage applications such as active archive, backup, online analytical processing, big data/big data processing and compliance. How do flash-based SSDs compare to HDD costs in these applications? Most IT pros will infer "not as well," and they would be correct. The largest capacity HDD shipping today is 8 TB in a 3.5-inch form factor. The largest capacity read-optimized SSD shipping this summer is 8 TB in a 2.5-inch form factor. Acquisition costs favor the HDD by a factor of 10. But power, cooling, rack space, floor space, weight and serviceability (among other factors) favor the SSD. And when deduplication and compression are applied PAGE 6 OF 9
7 to those SSDs, the TCO cost curve shifts markedly to the SSD. (Note: Deduplication/compression is currently an external array feature. That will be part of the software-defined data center in the near future.) So, do SSDs cost a lot more than HDDs? No. Do they cost more than HDDs? Sometimes, and sometimes they cost less. MYTH 4: HYPER-CONVERGED SYSTEMS CANNOT BE ALL-FLASH This belief stems from when initial hyper-converged systems did not support an all-flash SSD configuration. But that changed with the release of VMware vsphere 6.0 and VSAN 2.0. Hyper-convergence based on the latest VMware software does support all-flash SSD configurations. In fact, Dell is now selling all-flash hyper-converged systems. MYTH 5: FLASH SSDS ARE FASTER THAN HDDS Ask an IT pro if SSDs are faster than HDDs and few, if any, will disagree. In the vast majority of use cases, SSDs are faster than HDDs. However, there are specific circumstances when that is not true. SSDs will almost always provide more random IOPS at lower latencies than HDDs except when flash storage is closing in on the end of its flash write wear-life. Another case where this PAGE 7 OF 9
8 statement does not hold true is for sequential reads and writes. HDD performance shines for sequential reads and writes. The SSD-to-HDD performance differential in sequential reads and writes is nominal. PAGE 8 OF 9
9 FREE RESOURCES FOR TECHNOLOGY PROFESSIONALS TechTarget publishes targeted technology media that address your need for information and resources for researching products, developing strategy and making cost-effective purchase decisions. Our network of technology-specific Web sites gives you access to industry experts, independent content and analysis and the Web s largest library of vendor-provided white papers, webcasts, podcasts, videos, virtual trade shows, research reports and more drawing on the rich R&D resources of technology providers to address market trends, challenges and solutions. Our live events and virtual seminars give you access to vendor neutral, expert commentary and advice on the issues and challenges you face daily. Our social community IT Knowledge Exchange allows you to share real world information in real time with peers and experts. WHAT MAKES TECHTARGET UNIQUE? TechTarget is squarely focused on the enterprise IT space. Our team of editors and network of industry experts provide the richest, most relevant content to IT professionals and management. We leverage the immediacy of the Web, the networking and face-to-face opportunities of events and virtual events, and the ability to interact with peers all to create compelling and actionable information for enterprise IT professionals across all industries and markets. PAGE 9 OF 9
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