Tag:A sector

  • STM32 flash explanation

    Time:2021-12-2

    This article will explain the internal flash programming of stm32f207 according to the official flash programming manual of St, Document No.: pm0059. 01. General Flash here refers to the flash integrated in stm32f207 Flash memory has the following characteristics Maximum 1m byte capacity 128 bit, i.e. 16 byte wide data reading Byte, halfword, word and […]

  • [operating system persistence] I / O device

    Time:2021-11-18

    concept system architecture Let’s first look at the architecture of a typical computer system. The CPU is connected to the system memory through some memory bus or interconnection cable. Images or other high-performance I / O devices are connected to the system through conventional I / O bus, which will be PCI or its derivative […]

  • BIOS and bootloader

    Time:2021-11-11

    It is hereby explained that Liu Chao’sOn Linux operating systemIt is an important reference. Most of the content and all the pictures of this article come from this column. background knowledge Before understanding the working mode of computer under x86 architecture, the core of computer system isCPU, memory, busTo work.In addition, with the evolution of […]

  • Centos7 disk expansion

    Time:2021-10-22

    Others have detailed connections https://blog.csdn.net/haeydy/article/detai… Record the busy command steps sector — > physical partition — > physical volume (PV) – > volume group (VG) – > logical volume (LV) – > file system ##Check to see if space is available [[email protected] ~]# df -h #See if there are partitions available fdisk -l #If you […]

  • Linux system extends the partition where Oracle database is located

    Time:2021-10-7

    The production environment often encounters insufficient disk space. Next, let’s introduce the solution of LVM volume expansion. This article contains a long piece of code, which can be copied and slid to the left. I hope it will be helpful to you! Experimental environment System: centos7 The installation adopts LVM volume partition, and the Oracle […]

  • Operation and maintenance practice: Linux system expands the partition where Oracle database is located

    Time:2021-9-12

    The production environment often encounters insufficient disk space. Next, let’s introduce the solution of LVM volume expansion.Operation and maintenance practice: the Linux system extends the partition where the Oracle database is located. Operation and maintenance practice: the Linux system extends the partition where the Oracle database is locatedExperimental environment:System: centos7The installation adopts LVM volume partition, […]

  • Operation and maintenance practice: Linux system extends the partition where Oracle database is located

    Time:2021-6-27

    The production environment often encounters the situation of insufficient disk space. Next, we will introduce the solution of LVM volume expansion.Operation and maintenance: the partition where the Oracle database is extended by Linux system operation and maintenance: the partition where the Oracle database is extended by Linux systemThe experimental environment was as followsSystem: centos7The installation […]

  • Development of web call IC card reader Chapter 4 reading and writing IC card data

    Time:2021-6-9

    (IC card reader web reads and writes IC card data)Using the web plug-in of youwo Technology IC card reader can read and write the ordinary IC card. According to the actual business needs, you can manually click read and write and automatically read and write in the web page Read data from IC card web […]

  • Disk management of Linux system

    Time:2021-4-11

    With the gradual increase of things stored in the virtual machine, the hard disk of the virtual machine is also in urgent need, so it is urgent to expand a new virtual disk. Here’s how to add a new virtual disk to VMware: View existing disks [[email protected] ~]# lsblkNAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTsda […]

  • Linux knowledge

    Time:2021-3-25

    Basics The five units of a computer include:input unit 、output unit 、control unit 、arithmetic logic unit 、Storage unitTop fivepart. The CPU occupies the control and arithmetic logic unit, and the storage unit contains memory and auxiliary memory; Unit of measurement Carry system Kilo Mega Giga Tera Peta Exa Zetta Binary 1024 1024K 1024M 1024G 1024T […]

  • Creating logical volume in Linux

    Time:2021-3-5

    Create partition [[email protected] lohr]# fdisk /dev/sdb Welcome to fdisk (util Linux 2.23.2). The changes stay in memory until you decide to write them to disk.Think twice before using the write command. Device does not contain a recognized partition tableUse the disk identifier 0xa7a34d5d to create a new DOS disk label. Command (enter m for help): […]

  • Creating swap partition in Linux

    Time:2021-3-3

    Create partition [[email protected] lohr]# fdisk /dev/sdb Welcome to fdisk (util Linux 2.23.2). The changes stay in memory until you decide to write them to disk. Think twice before using the write command. Command (enter m for help): P Disk / dev / SDB: 5368 MB, 5368709120 bytes, 10485760 sectors Units = sector of 1 * […]