Linux Fourth week micro jobs

1, create a 10G partition, and the format of the Ext4 file system;

1) Use Fdisk-l to view the disk

2) use the fdisk/dev/[hs]d[a-z] command, for example, my fdisk/dev/sdb into the Fdisk tool

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n choose to create a new partition

P Create logical partition, E Create extended partition

W Save changes and exit the Fdisk tool

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After saving the Fdisk tool, update the partition table with Partx-a/dev/sdb

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Use MKFS.EXT4 to format the corresponding partition, MKFS.EXT4/DEV/SDB5,

Then use Blkid to view the specified block device information: BLKID/DEV/SDB5

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(1) The block size is required to 2048, the reserved space percentage is 2, the volume label is MyData, the default Mount property contains ACLs;

~]# mke2fs-t ext4-b 2048-m 2-l mydata/dev/sdb7

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Then use Df-h to view

(2) Mount to the/data/mydata directory, require the mount to prohibit the program to run automatically, and do not update the file access time stamp;

1) Create the/data/mydata directory first

2) Mount Mount-o noatime,noexec/dev/sdb7/data/mydata #noatime不更新文件时间戳

Prevent programs from running automatically when #noexec mounted

2, create a swap partition of size 1G, and create a good file system, and enable it;

1) Use FDISK/DEV/SDB to enter the disk utility

2) using N to create a new partition, I am here to create a new partition on the extended partition, and by default select Start Cylinder, +1g

3) Input L query the type to be partitioned, find swap,

4) Use T to select Type and enter 82, save and eject W

5) Update the partition table with Partx-a/dev/sdb

6) Use a dedicated MKSWAP format partition MKSWAP/DEV/SDB6

7) enable the Swap partition SWAPON/DEV/SDB6

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3. Write a script

(1), obtain and list all disk devices on the current system;

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(2), display the space usage information about each partition on each disk device;

#!/bin/bash

Read-p "Please enter the SDA,SDB or any key" key #读取变量

Case $KEY in #如果变量为sda

Sda

df-h | grep SDA

Fdisk-l/DEV/SDA

;;

Sdb

df-h | grep SDB

Fdisk-l/dev/sdb

;;

*)

Df-h

Esac

4. Summarize the different levels of RAID and its combination mode and performance;

raid-0:0, strip reel, strip; RAID-1:1, mirrored volume, mirror; RAID-2 ... Raid-5:raid-6 RAID10 RAID01

RAID-0: Read and write performance improvement; free space: N*min (S1,s2,...)

No fault tolerance, minimum number of disks: 2,

Continuously split the data and read/write on multiple disks in parallel. Therefore has a high data transmission rate, the disadvantage is no redundancy

RAID-1: Read performance improvement, write performance slightly decreased; free space: 1*min (S1,s2,...)

Redundant capacity, minimum number of disks: 2,

But data security is very high, one-to-one redundancy, performance, read Medium, slow write

RAID-5: Read, write performance improvement, free space: (N-1) *min (s1,s2,...)

Fault tolerance: 1 disks, minimum number of disks: 3, data divided into three parts

If a disk is broken, does the data self-derive 1+? +1=3, so raid is redundant. But the actual capacity of the RAID5 is only 2 blocks of 3 hard drives, with high read performance and low write performance

Mixed type

RAID-10: Read, write performance improvement, free space: N*min (S1,s2,...) /2

Fault tolerance: Each group of mirrors can only be broken at most; minimum number of disks: 4, 4+

5, the creation of a size of 10G RAID1, requires a free disk, and chunk size of 128k;

1) Create 2 + 10G partitions using the Fdisk tool

2) Fdisk/dev/sdb, and then use N to create a partition of 10G 2 partitions

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3) Save W, then partx-a/dev/sdb Update partition table

mdadm -C  /dev/md0 -l 1 -c 128 -n 2  4 /dev/sdb5 ) /dev/sdb6或者

mdadm -C  /dev/md0 -l 1 --chunk 128 -n 2  /dev/sdb5 /dev/sdb6 #创建级别为1chunk为128，的磁盘md0 5）mkfs.ext4  /dev/md0 #建立成功后格式化 6）mkdir /tmp/md0 #创建文件夹 7）mount /dev/md0 /tmp/md0 #挂机文件系统 8）df -h  #查看文件系统

6, the creation of a size of 4G RAID5 device, chunk size of 256k, format Ext4 file system, required to automatically mount to the/backup directory, and do not update the access timestamp, and support ACL function;

1) Use Fdisk/dev/sdb to enter the Fdisk tool to create a new partition Sdb11,sdb12,sdb13 each 4G

2) Save exit, partx-a/DEV/SDB Update partition table

3) ~]# mdadm-c/dev/md5-a yes-l 5-c 256-n 3/dev/sdb11/dev/sdb12/dev/sdb13

4) ~]# Mkfs.ext4/dev/md5 #建立成功后格式化

5) ~]# Mkdir/bachup #创建文件夹

6) ~]# Mount-o acl,noatime/dev/md5/backup #挂机文件系统不更新时间戳, and has ACL function

7) ~]# blkid/dev/md5 look at the UUID and copy the file in the back row of the/etc/fstab to let it boot up

8) df-h View File system

This article is from the "11822904" blog, please be sure to keep this source http://11832904.blog.51cto.com/11822904/1954034

Linux Fourth week micro jobs