reformat ssd

Test throughput:The test system throughput is not critical, and the most important is the impact before and after the use of DRBD performance. This test uses a m block to the drbd device for comparative testing.#! /Bin/bashResource = r0Test_device = 'drbdadm sh-dev $ resource'Test_ll_device = 'drbdadm sh-ll-dev $ resource'Drbdadm primary $ resourceFor I in $ (seq 5)DoDd if =/dev/zero of = $ test_device bs = 512 M count = 1 oflag = directDoneDrbdadm down $ resourceFor I in $ (seq 5)DoDd if =/dev/

Download Yosemite, format the disk, run the following command to make the OS X boot diskSudo/applications/install\ os\ x\ Yosemite.app/contents/resources/createinstallmedia--volume/volumes/untitled-- Applicationpath/applications/install\ os\ x\ Yosemite.app--nointeraction How to make Fusion drive. Starting from the U disk, go to the disk utility and format the SSD and HHD separately. Then enter the console and run the following command.The first instr

Ceph environment setup (2)1. There are three layout hosts: node1, node2, and node3. Each host has three osdks, as shown in figure. osd1, and 8 are SSD disks, 4 is the SATA disk. Each of the three hosts has a Monitor and an MDS. We use osd1, 3, and 4 to create a pool named ssd, in the form of three copies, osd0, and 2, 4 to build a Pool named sata, in the form of Erasure code, k = 2, m = 1, that is, use two

802.1 issues in LINUX-general Linux technology-Linux technology and application information. For details, refer to the following section. The younger brother is a newbie. students in the school. The campus network does not have a LINUX client, so they have to find one on the Internet. After installation, the following prompt is displayed during running: [Root @ BYSTANDER mdc-ssd] # mdc-ssd Fcntl (F_SETFL):

Symptoms and causes of SSD freezingI7 ● SSD choppy symptomsA friend who recently bought a new SSD may be troubled by a problem, that is, the system stops responding or gets stuck for no reason. The specific situation can be shown as follows according to the SSD master:1. Sandforce control: during normal computer operat

The CEpH experiment environment has been used within the company for a period of time. It is stable to use the Block devices provided by RBD to create virtual machines and allocate blocks to virtual machines. However, most of the current environment configurations are the default CEpH value, but the journal is separated and written to a separate partition. Later, we plan to use CEpH tier and SSD for some optimizations: 1. Write journal to a separate

As we all know, solid-state hard drive optimization (hereinafter referred to as SSD) can make the use of disk more efficient. Here we will teach you how to optimize your SSD in different ways. Data that may be stored during optimization is lost, so it is recommended that you back up the original data first. SSD optimization is a very targeted setup process, this

applications of solid-state hard disk generally have different interfaces. Solid-state hard disk compared with traditional mechanical hard disk, interface specifications are more easily confused by the initial users, the following is described below: 　　Mainstream common--sata interface SATA interface is no longer a new technology, since 2001 SATA 1.0 to the current SATA2.0 and SATA3.0, has made SATA as the current solid-state hard disk main interface. In terms of current usage, SATA2.0 users

With the innovation of storage technology, solid-state hard disk (SSD) plays an increasingly important role in enterprise application. The advantages of SSD performance are obvious compared with traditional hard disk, whether it is read-write or random access speed. But traditional hard drives are mature products that have existed for decades as mainstream storage media and have been supported by a series o

from a technical point of view, NAND Flash Flash Media Although there is a problem of the number of erase times, but with software algorithms, system-level data protection technology,NAND flash life is no longer a difficult problem, and NAND flash More advantages have become an important driving force for the technology to move forward. SSDs built with NAND Flash are rapidly replacing traditional disks, have been widely used in the Internet, and continue to penetrate into the enterprise-class m

Practical recruit one: specific speed The biggest advantage of SSD is high speed reading and writing speed. Traditional hard drive lane speed in the reading and writing 70m/s, and professional enterprise-level SSD can reach read and write 120m/s above, random read and write speed, ioPS read is hard drive about 100 times times, write is about 10 times times. Solid-state hard disk speed is mainly to look at

How do I differentiate the solid-state drives of the M.2 interface? M.2 is Intel led the development of a new generation of interface standards, with a smaller size, faster interface features, the current main specifications are the following, mainly the length is not the same. The image below is a two-m.2 SSD: The short one is the Shadow Armor War m.2 128GB Long is the Shadow Armor War m.2 256GB These two are m.2 interfac

7200RPM mechanical hard disk, also added a 2G memory, let it serve 2 years. According to the "Moore's Law" of integrated circuit components every 18-24 months to increase the number of times, performance will be nearly one more times, my "little black" is almost three times times the mainstream of the market. And now a variety of software volume and the hardware operating environment required space resources is also more and more high (those software manufacturers, you do not think the hardware

With the popularization of SSD solid-state drives, now with the cache of SSD prices are gradually accepted by users, although we know that there is no cache of SSD in the price will be slightly more expensive than the cache, but the cache on the SSD solid state hard drive how the role played by not every user is aware.

With the popularization of SSD solid-state drives, now with the cache of SSD prices are gradually accepted by users, although we know that there is no cache of SSD in the price will be slightly more expensive than the cache, but the cache on the SSD solid state hard drive how the role played by not every user is aware.

Can TRIM operations be performed in RAID? I wonder if you have considered the following question: can TRIM operations be supported in RAID? Imagine how to unmap the data block in the SSD by using the TRIM command after the RAID is created on the SSD and the application software (File System) runs directly on the RAID software? It seems that this is not a problem. In fact, it is a big problem for RAID. From

Intel has recently been exerting its power at the channel end, and the computer stores, 3C stores and the manufacturers of the manufacturers have been pushing the pole. However, in the face of "super extreme" this jerky vocabulary, a large number of users do not understand their meaning. Many consumers think "ultra-extreme" means super lightweight and super performance. There are many consumers do not understand the use of expensive SSD, there are a l

of load determine that all storage devices must have the highest possible performance to cope. The ideal goal is that both types of load can achieve the same performance as the top-level memory in Figure 2. At the same time, it is also expected that it has a non-volatile external memory as shown in the bottom layer of the figure to make up for the problem that data is easy to lose when there is a power failure in the inner. From the memory to the external storage level, we can see that the idea

Last Saturday, I attended a Baidu technology Salon held by infoq. The topic is about MySQL. There were a lot of people present on that day. Some of them were unexpected, maybe because they were free of charge :) There are two speakers, the first from Baidu, who mainly introduced Baidu's work on SSD/flash and the second from terradata. The topic is about spatial database. Frankly speaking, the first speech was very good. We can see that Baidu has done

What is a solid-state drive? How do you use it? Correct use of solid-state hard disk method Guess what you like: the difference between m.2 and SATA3 SSD In general, the proper use of solid-state drives is nothing more than 4K alignment and the ability to turn on the hard drive AHCI. In addition there are a few people will not notice the details, the previous article has not been detailed with you, the following article to explain in detail under