Linux Basic article -24,swap Exchange partition temporary emergency and division method

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Swap

View physical memory and swap partition sizes and their usage

[Email protected] ~]# free-m

Total used free shared buffers Cached

mem:1869 192 1676 0 13 65

-/+ buffers/cache:114 1755

swap:255 0 255

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Create swap partition

[Email protected] ~]# FDISK/DEV/SDA

N

+2g

T

8

82

W

/dev/sda8 9198 9459 2104483+, Linux Swap/solaris

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formatting partitions

[Email protected] ~]# mkswap/dev/sda8

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Mount Swap Partition

[Email protected] ~]# swapon/dev/sda8

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Uninstalling swap partitions

[Email protected] ~]# swapoff/dev/sda8

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Loopback device Loopback

Using software to emulate hardware

Swap partitions with files (temporary emergency)

[[email protected] ~]# dd If=/dev/zero of=/var/swapfile bs=1m count=1024

[Email protected] ~]# Mkswap/var/swapfile

[Email protected] ~]# Swapon/var/swapfile

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Create an image file

DD If=/mn/cdrom Of=/usb/cdrom.backup.iso

Backup MBR

DD IF=/DEV/SDA of=mnt/usb/mbr.backup bs=512 count=1

DD If=mnt/usb/mbr.backup OF=/DEV/SDA

DD command: Powerful copy command

if= Data sources

of= Data storage target

Bs=1

conut=2

seek=#: Skipped file space size

This article is from the "James Zhan Linux Advanced ops" blog, so be sure to keep this source http://jameszhan.blog.51cto.com/10980469/1878633

Linux Basic article -24,swap Exchange partition temporary emergency and division method