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state than the thread's information, while a process shares the process of multiple threads and memory resources in the state* Processes have separate address spaces, while threads share their address space* Processes can only communicate through system-provided interactions between interprocess communication mechanismsContext switches are usually faster than the context process between the same process threads.Windows NT and OS/2, such as the system, are said to have

RAID is an abbreviation for redundent array of inexpensive disks, literally "Redundant array of Inexpensive Disks" or "Disk array". Later, the letter I in the raid was changed to Independent,raid as a "stand-alone redundant disk array". The disk array is made up of a number of inexpensive, smaller, more stable, slower disks, combined into a large disk group, to i

raid Introduction: RAID (Redundant array of inexpensive Disks) is called a redundant array of inexpensive disks. The basic principle of RAID is to put multiple inexpensive small disks RAID level description; generally used RAID class, Are RAID 0, RAID1, RAID 2, RAID 3, RAID 4, and RAID 5, plus two-in-one raid 0+1 or RAID 1+0﹝ or RAID 10﹞. Let's compare the

　　The disk array (redundant Arrays of inexpensive disks,raid) has the meaning of "inexpensive and redundant disk arrays". the principle is to use array method to do disk group, with the design of data distributed arrangement, improve the security of data. The disk array is made up of many inexpensive, small, stable, slow disks, combined into a large disk group, a

A disk array is a system that makes several towers drives as a whole, and the entire disk array is managed by an array controller. The full name of the array card is that the disk array card is used for RAID (inexpensive Redundant array of disks). Redundant disk array raid (redundant array of independent disks) technology was proposed by the University of California, Berkeley, in 1987, originally designed to combine small,

How can network managers implement bandwidth-intensive applications on local area networks (LANs) when budgets are tight and must maintain existing network systems? The latest Ethernet technology, 1000BASE-T (Gigabit Ethernet on the five-type twisted pair) can help network administrators quickly improve the performance of your network in a simple and inexpensive way.1000BASE-T is an Ethernet technology that provides 1000Mbps of transmission bandwidth

processing, servlet containers used to handle static images and text is very extravagant, Apache, Nginx, squid are excellent solutions. 3, the page static: The Internet Application "cache for King", which may be a number of scenarios can bring Whaley most obvious one, through static page generation and access, effectively reduce the system load. WEB2.0 's application cache hit rate is usually slightly worse. 4, database optimization: The user's access is difficult to meet, the database hardware

Raid:Redundant Arrays of Inexpensive DisksIndependentBerkeley:a Case for redundent Arrays of inexpensive Disks RAIDImproved IO capability:Parallel disk read and write;Increased durability;Disk redundancy to achieveLevel: Multiple disk organizations work together in different ways;How the raid is implemented:External disk array: Adapter capability with expansion cardsOn-chip RAID: Motherboard integrated RAID

Inode and the directory entries have been written to disk, and the transaction can be considered closed. Btrfs modifies the superblock so that it points to A ', as shown in:Figure 7. COW Transaction 3COW transactions ensure file system consistency, and the system does not need to perform fsck after Reboot. Because superblock either points to the new a ', or to a, whichever is the consistent data.ChecksumChecksum technology ensures the reliability of the data and avoids the silent corruption phe

. If you have critical files, you should have a plan to copy these files to a removable disk.Items that need to be backed up:User files: The user files in the/home directory are backed up every day.Profiles: Profiles in the/etc and/var directories do not require frequent backups and are backed up once per week or month, depending on how frequently configuration changes are made.Program Files: The program files in the/USR and/opt directories are rarely changed and can be backed up after installat

Transferred from: http://www.linuxidc.com/Linux/2015-08/122191.htmRAID means a redundant array of inexpensive disks (redundant array of inexpensive Disks), but now it is known as a redundant array of independent disks (redundant array of independent Drives). Earlier a very small disk was very expensive, but now we can buy a larger disk cheaply. Raid is a collection of disks that are put together to become a

1. RAID basic concept and mdadm implement soft raid2, Mdadm command and bash Loop advanced3, Linux management of LVM detailed4, compression decompression and the use of archiving toolsOne, raid:redundant array inexpensive Disks inexpensive redundant disk array.1.1 The hard drive is connected to the motherboard via the IDE interface and cable, how can a user or system think of multiple disks as a whole, we n

-p/data/mydata# Mount-o Noatime,noexec/dev/sdb1/data/mydata2, create a swap partition of size 1G, and create a good file system, and enable it;# MKSWAP/DEV/SDB2Setting swap space version 1, size = 1048572 KiBNo label, Uuid=a5c89d64-5fda-4ebd-9b00-92231cd57bae# SWAPON/DEV/SDB23. Write a script(1), obtain and list all disk devices on the current system;(2), display the space usage information about each partition on each disk device;#!/bin/bash#fdisk-l | Grep-o "/dev/sd[[:alnum:]]\{2\}" Echo df-h4

RAID It means a redundant array of inexpensive disks (redundant array of inexpensive Disks), but now it is known as a redundant array of independent disks (redundant array of independent Drives). Earlier a very small disk was very expensive, but now we can buy a larger disk cheaply. Raid is a collection of disks that are put together to become a logical volume. AID contains a group or a collection or even a

RaidRedundant array of Inexpensive disksRedundant Arrays of Inexpensive DisksDifferent levels of RAID capabilities and features vary Compare items RAID0 RAID1 RAID10 RAID5 Number of disks >=2 >=2 >=4 >=3 Storage utilization 100% 50% 50% N/n-1 Redundant check disk 0 0 0 1

installation. Typically, program files can easily be recovered from the original installation disk.Select Backup mediaThere are several options for where to save the backup. Here are some options for backup media:Floppy: If you want to quickly back up important files or bring them home, the floppy disk is still an optional backup medium.Disc Writer: As the disc writer becomes more reliable and the price is getting lower, the disc itself is very inexpensive