###unit.5 LVM###

###1.LVM建立

1.划分物理分区并把分区id修改为8e

[root@desktop18 ~]# fdisk /dev/vdb

Welcome to fdisk (util-linux 2.23.2).

Changes will remain in memory only, until you decide to write them.

Be careful before using the write command.

Device does not contain a recognized partition table

Building a new DOS disklabel with disk identifier 0x9546a42c.

Command (m for help): n

Partition type:

   p   primary (0 primary, 0 extended, 4 free)

   e   extended

Select (default p): 

Using default response p

Partition number (1-4, default 1): 1

First sector (2048-20971519, default 2048): 

Using default value 2048

Last sector, +sectors or +size{K,M,G} (2048-20971519, default 20971519): +500M

Partition 1 of type Linux and of size 500 MiB is set

Command (m for help): n

Partition type:

   p   primary (1 primary, 0 extended, 3 free)

   e   extended

Select (default p): 

Using default response p

Partition number (2-4, default 2): 2

First sector (1026048-20971519, default 1026048): 

Using default value 1026048

Last sector, +sectors or +size{K,M,G} (1026048-20971519, default 20971519): +500M

Partition 2 of type Linux and of size 500 MiB is set

Command (m for help): t

Partition number (1,2, default 2): 1

Hex code (type L to list all codes): 8e

Changed type of partition ‘Linux‘ to ‘Linux LVM‘

Command (m for help): t

Partition number (1,2, default 2): 2

Hex code (type L to list all codes): 8e

Changed type of partition ‘Linux‘ to ‘Linux LVM‘

Command (m for help): p

Disk /dev/vdb: 10.7 GB, 10737418240 bytes, 20971520 sectors

Units = sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disk label type: dos

Disk identifier: 0x9546a42c

   Device Boot      Start         End      Blocks   Id  System

/dev/vdb1            2048     1026047      512000   8e  Linux LVM

/dev/vdb2         1026048     2050047      512000   8e  Linux LVM

Command (m for help): wq

The partition table has been altered!

Calling ioctl() to re-read partition table.

Syncing disks.

pvs|pvdisplay

vgs|vgdisplay

lvs|lvdisplay

监控命令

watch -n 1 \

‘echo"===pvinfo==="\

;pvs\

;echo"===vginfo==="\

;vgs\

;echo"===lvinfo==="\

;lvs\

;df -h /mnt‘

===pvinfo===

  PV         VG   Fmt  Attr PSize   PFree

  /dev/vdb1  tbr  lvm2 a--  496.00m      0

  /dev/vdb2  tbr  lvm2 a--  496.00m 392.00m

===vginfo===

  VG   #PV #LV #SN Attr   VSize   VFree

  tbr    2   1   0 wz--n- 992.00m 392.00m

===lvinfo===

  LV   VG   Attr       LSize   Pool Origin Data%  Move Log Cpy%Sync Convert

  lv0  tbr  -wi-ao---- 600.00m

pvcreate /dev/vdb1

vgcreate westos /dev/vdb1

lvcreate -L 100M -n lv0 westos

mkfs.xfs /dev/westos/lv0

mount /dev/westos/lv0 /mnt

lvextend -L 200M /dev/westos/lv0

xfs_growfs /dev/westos/lv0

pvcreate /dev/vdb2

vgextend westos /dev/vdb2

lvextend -L 600M /dev/westos/lv0

xfs_growfs /dev/westos/lv0

fdisk /dev/sdb

umount /mnt/

mkfs.ext4 /dev/westos/lv0 

e2fsck -f /dev/westos/lv0

resize2fs /dev/westos/lv0 200M

mount /dev/westos/lv0 /mnt

lvreduce -L 200M /dev/westos/lv0

pvmove /dev/vdb1 /dev/vdb2

vgreduce westos /dev/vdb1

vgreduce --removemissing ##清除不知道的东西

lvcreate -L 10M -n lv0-backup -s /dev/westos/lv0 ##快照

umount /mnt

lvremove /dev/westos/lv0-backup 

lvremove /dev/westos/lv0

vgremove westos

pvremove /dev/vdb2

fdisk /dev/vdb

fdisk /dev/vdb

#!/bin/bash

fdisk /dev/vdb << end

n

+1G

wq

end

格式为file.sh 命令为sh file.sh

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