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The result is that applications demanding more concurrent I/O activity along with lower latency (response time) will gravitate toward NVMe for fast access storage. These and other improvements with NVMe enable concurrency while reducing latency to remove server storage I/O traffic congestion.
SATA allows for only one command queue capable of holding 32 commands, and SAS supports a queue with 64K command entries. NVMe unlocks the potential of flash-based storage by allowing up to 65,536 (64K) queues with 64K commands per queue. Unlike NVMe, SAS and SATA were not designed with flash SSDs in mind.
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While 12 Gb/s SAS and 6 Gb/s SATA (e.g., SATA III) have enabled the use of faster flash-based SSDs, the full performance benefit of flash is not being realized, even with faster PCIe. They were originally devised in an era when there were fewer cores in processors and there were fewer and slower HDDs connected to a server (or storage system). SAS and SATA disk technology has served the storage industry well. The benefits include lower latency, improved concurrency, increased performance and the ability to unleash a lot more of the potential of modern multi-core processors. NVMe has been designed from the ground up for accessing fast storage, including flash SSD leveraging PCI express (PCIe). Both SATA and SAS are used today for accessing hard disk drives (HDDs) and solid state drives (SSDs).
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NVMe is a new protocol alternative to advanced host controller interface (AHCI), also known as SATA, and the SCSI protocol used by serial attached SCSI (SAS). Implementation of NVMe should move forward with a full appreciation of what it is and how it fits in with existing data storage protocols. Figure 1 shows a modern server storage I/O architecture model with NVMe.įigure 1: Server Storage I/O Architectures SAS, SATA and NVMe Knowing what will be needed enables IT to plan for a smoother transition to an NVMe future. There are important decisions you should be making today to set the stage for investment protection and future-proofing server storage I/O acquisitions related to NVMe. While the first piece in this series provided a general overview of NVMe and its benefits, this one focuses more on implementation planning and strategy. View companion pieces in this series, along with other content, at Data Center Challenges
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In this piece, we look at how to get ready for the NVMe server storage I/O wave in order to keep pace with the rising tide of increased data and I/O performance. This Server StorageIO™ low-latency learning piece, compliments of Micron Technology, is the second in a series that provides guidance pertaining to nonvolatile memory express (NVMe) and how this technology can help you prepare today for the data center of tomorrow. By Greg Schulz and Doug Rollins Introduction
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