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Micron 16GB DDR4-2666 NVDIMM-N out of the box experience and application scenarios
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Micron 16GB DDR4-2666 NVDIMM-N out of the box experience and application scenarios

  • Categories:Industry news
  • Author:倍联德实业
  • Origin:
  • Time of issue:2018-07-12 13:48
  • Views:17

Micron 16GB DDR4-2666 NVDIMM-N out of the box experience and application scenarios

(Summary description)I believe that when you use a computer at home or in an Internet cafe to encounter some non-hardware failures, the quickest solution is to reset the reboot or force the power off and then turn it on again. This may be the computer with a hardware or software device such as a restore card or shadow system to restore the original system and data.

  • Categories:Industry news
  • Author:倍联德实业
  • Origin:
  • Time of issue:2018-07-12 13:48
  • Views:17
Information

I believe that when you use a computer at home or in an Internet cafe to encounter some non-hardware failures, the quickest solution is to reset the reboot or force the power off and then turn it on again. This may be the computer with a hardware or software device such as a restore card or shadow system to restore the original system and data. In addition to saving things, restarting the computer can solve most problems - because once the power is turned off, the memory The data is gone, everything has to be new, maybe it will be normal.

Because DRAM memory is volatile, DRAM is also called dynamic random access memory. In order to maintain data, DRAM must be refreshed once every time during power-on. Once the memory unit is powered off, it is not refreshed. The information will be lost. But this feature is not a good thing for server applications, because data security is the most important for these applications.

While NVDIMM is a kind of non-volatile memory, what is non-volatile memory? NVDIMM is derived from BBU (Battery Backed Up) DIMM. The BBU uses a backup battery containing heavy metals to maintain the contents of the normal volatile memory for hours, but does not meet the requirements of green energy. Thus, NVDIMMs with supercapacitors as a power source have emerged, and NVDIMMs use non-volatile flash storage media to store data, and data can be stored for longer. With it, you don't have to worry about data loss caused by accidents such as power outages. Micron shipped the first 8GB DDR4-2133 NVDIMM memory in the world as early as 2016. The current maximum capacity is 32GB DRAM+64GB NAND Flash. Today, I would like to introduce you to the Micron 16GBNVDIMM-N memory.

美光16GB DDR4-2666 NVDIMM-N开箱体验及应用场景

Micron's NVDIMM-N DDR4 memory

Micron's NVDIMM memory looks like normal DDR4 memory (in fact it is DDR4 memory), capacity 16GB, speed 2666MT/s, CL19 delay, 288pin pin, bandwidth 21.3GB/s, voltage 1.2V, these indicators and ordinary DDR4 The -2133 memory is the same, the difference is that there is a 16GB SLC Flash storage granule on the NVDIMM memory, an AGIGA NVDIMM controller chip, and two Backup Power ports.

美光16GB DDR4-2666 NVDIMM-N开箱体验及应用场景 美光16GB DDR4-2666 NVDIMM-N开箱体验及应用场景

Micron NVDIMM-N memory specifications

美光16GB DDR4-2666 NVDIMM-N开箱体验及应用场景

Micron NVDIMM memory profile

The memory itself is not special, but its biggest feature is the 2.5-inch "accessory" below - this is not a hard disk, but a super capacitor, which has a fast charging speed, long cycle life and high power density. The capacity is also large, resistant to low temperatures and high temperatures. Here, the super capacitor of Micron NVDIMM memory is equivalent to an uninterruptible power supply, which can help users complete data backup and recovery under unexpected conditions and prevent accidental data loss. The principle of the solution used is nothing more than mapping the data in the DRAM to the non-volatile NAND flash memory after an unexpected power failure. The capacitor is equivalent to the power supply.

美光16GB DDR4-2666 NVDIMM-N开箱体验及应用场景 美光16GB DDR4-2666 NVDIMM-N开箱体验及应用场景

Next, let's take a look at the application of NVDIMM. NVDIMM can be applied to three aspects, data protection, disk cache and storage chain:

Data protection, WSP for typical applications. Whole system protection (whole system preservation), referred to as WSP. Conventional DRAM memory loses data in the event of an abnormal power loss or system crash, and some database environments cannot withstand downtime, such as online transaction processing and financial services; these applications can benefit from NVDIMM The fast data reconstruction time provided by the memory. For example, after a system power failure, the system can save the current working state of the entire computer system (including CPU, bridge chip, network card and other hardware devices and all processes in the system) to NVDIMM in a short time. After the system is powered on again, it immediately returns to the previous operating state, as if the system was just "snapped."

Today, with the rapid development of cloud technology, virtualization technology has received extensive attention and innovation as the core technology of the cloud. At the same time, as the underlying carrier of cloud service operation, the data security and integrity of virtual machines is an important issue that needs to be solved urgently. A virtual machine is essentially a software-simulated complete computer system with a complete hardware system function running in a completely isolated environment, which means that all running states of the virtual machine are in memory. NVDIMMs can take advantage of the snapshot function of the virtual machine itself to quickly protect temporary snapshots stored in memory under abnormal system conditions to protect the entire virtual machine.

Disk caching is to reduce the number of times the CPU reads and writes disks through I/O, improves the efficiency of disk I/O, and uses a portion of memory to store more frequently accessed disk contents. The existence of the disk cache poses a problem for the consistency of data access. In particular, the write cache using the write-back policy causes the updated data in the memory to be lost to the disk in case of abnormal power failure. NVDIMM is the best storage medium for write caching. Its random access nature allows the CPU and operating system to directly access management, and non-volatile guarantees that data is protected against abnormal power loss.

Currently, write cache NVDIMMs for RAID controllers are gradually being accepted. For computers with onboard RAID controller chips or software RAID solutions, lack of write cache, NVDIMM can be used directly as system main memory, with the operating system to complete the write cache task. There is also a RAID controller card with a PCIE interface that uses a common battery-backed memory module as a cache. NVDIMMs can directly replace these memory modules.

The storage chain stores the data in the entire storage system in different non-volatile storage media according to security, performance requirements and frequency of use.

美光16GB DDR4-2666 NVDIMM-N开箱体验及应用场景

As shown in the figure, a typical storage chain example. Data with higher IO performance requirements is stored on the SSD, while lower data is required to be placed in various types of disk arrays and NAS. NVDIMMs are the forefront of the storage chain, which is faster than SSDs and offers direct random access. The CPU's memory barrier and flush cache instructions ensure atomic write and consistency of NVDIMM data. Therefore, NVDIMM is well suited as a storage medium for file systems or database metadata and logs.

                      Best SSD          vs.       NVDIMM

IOPS

300,000

1,400,000(4.5)

延迟

10ms

10ns(1000)

5年写数据量(TB)

29,000

2,800,000

Cost/PB

$100

$0.4c(250)

SSD and NVDIMM performance comparison

In addition, in addition to the data protection function, NVDIMM memory has outstanding advantages in writing IOPS, delay time, amount of data written, and price per PB. With the development of cloud computing, the data access speed (hard disk I/O) bottleneck is particularly prominent, and the emergence of NVDIMM memory is expected to solve this problem.

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