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linux LVM管理扩充/缩减分区

admin linux服务 2021-03-23 220浏览 0

LVM管理扩充/缩减分区

#lvs 查看lvm

#pvcreate /dev/sda4         创建pv

Physical volume "/dev/sda4" successfully created


[root@localhost ~]# vgextend VolGroup00 /dev/sda4   

(将创建的pv加入vg  VolGroup00是当前需要扩充的vg名,通过vgdisplay显示vg)

  Physical volume "/dev/sda4" successfully created

  Volume group "VolGroup00" successfully extended


 [root@localhost ~]# vgdisplay    查看vg

  --- Volume group ---

  VG Name               VolGroup00

  System ID             

  Format                lvm2

  Metadata Areas        2

  Metadata Sequence No  3

  VG Access             read/write

  VG Status             resizable

  MAX LV                0

  Cur LV                1

  Open LV               1

  Max PV                0

  Cur PV                2

  Act PV                2

  VG Size               13.88 GB

  PE Size               32.00 MB

  Total PE              444

  Alloc PE / Size       312 / 9.75 GB

  Free  PE / Size       132 / 4.12 GB

  VG UUID               1tWPvj-N1a5-T7uQ-yXqG-oAbB-MP4z-5k0bEe

(主要查看 Free  PE / Size       132 / 4.12 GB ,说明我们最多可以有4.12G的扩充空间。一般选择小于4.12G)


[root@localhost ~]# lvextend -L +4.11G /dev/VolGroup00/LogVol00 /dev/sda4 

 (如果没有“+” 则表示增加到的数值,比如lvextend -L 20G....,则此lv就设置为20G 而不是增加20G)

  /dev/hdc: open failed: 找不到介质

  Rounding up size to full physical extent 4.12 GB

  Extending logical volume LogVol00 to 13.88 GB

  Logical volume LogVol00 successfully resized


(做fsck,检查文件系统)

 e2fsck -a /dev/VolGroup00/LogVol00  


重新加载逻辑卷的大小使其生效。需要使用resize2fs命令将文件系统扩展到增加的空间上:

[root@turbolinux ~]# resize2fs /dev/VolGroup00/LogVol00    (lv path)


注:如果是xfs的文件系统 用 xfs_growfs /dev/VolGroup00/LogVol00    

#df -h 查看一下你的系统磁盘空间"/"目录是否增加


缩减lv大小

[root@localhost ~]# lvreduce -L -1G /dev/VolGroup00/LogVol01 

  /dev/hdc: open failed: 找不到介质

  WARNING: Reducing active and open logical volume to 2.91 GB

  THIS MAY DESTROY YOUR DATA (filesystem etc.)

Do you really want to reduce LogVol01? [y/n]: y

  Reducing logical volume LogVol01 to 2.91 GB

  Logical volume LogVol01 successfully resized

[root@localhost ~]# vgdisplay

  --- Volume group ---

  VG Name               VolGroup00

  System ID             

  Format                lvm2

  Metadata Areas        2

  Metadata Sequence No  7

  VG Access             read/write

  VG Status             resizable

  MAX LV                0

  Cur LV                2

  Open LV               2

  Max PV                0

  Cur PV                2

  Act PV                2

  VG Size               49.88 GB

  PE Size               32.00 MB

  Total PE              1596

  Alloc PE / Size       1564 / 48.88 GB

  Free  PE / Size       32 / 1.00 GB

  VG UUID               JeJ3dU-sKI6-Pvfw-2ddT-CLnC-fy3O-ywVc0Z



增加硬盘(磁盘挂在)


[root@localhost ~]# fdisk /dev/sda


The number of cylinders for this disk is set to 2088.

There is nothing wrong with that, but this is larger than 1024,

and could in certain setups cause problems with:

1) software that runs at boot time (e.g., old versions of LILO)

2) booting and partitioning software from other OSs

   (e.g., DOS FDISK, OS/2 FDISK)


Command (m for help): m       列出fdisk的帮助

Command action

   a   toggle a bootable flag

   b   edit bsd disklabel

   c   toggle the dos compatibility flag

   d   delete a partition

   l   list known partition types

   m   print this menu

   n   add a new partition

   o   create a new empty DOS partition table

   p   print the partition table

   q   quit without saving changes

   s   create a new empty Sun disklabel

   t   change a partition's system id

   u   change display/entry units

   v   verify the partition table

   w   write table to disk and exit

   x   extra functionality (experts only)


Command (m for help): n    命令n用于添加新分区

Command action

   e   extended

   p   primary partition (1-4)

p                                    这里命令p选择创建主分区

Selected partition 4

First cylinder (1550-2088, default 1550): 

Using default value 1550

Last cylinder or +size or +sizeM or +sizeK (1550-2088, default 2088): 

Using default value 2088



Command (m for help): t      命令t改变主分区的ID

Partition number (1-4): 4      fdisk会让你选择主分区的编号,如果已经有了主分区sda1,sda2,这里选4,即要创建的该分区为sda4

Hex code (type L to list codes): 8e     指定要改成的id号,8e代表LVM

Changed system type of partition 4 to 8e (Linux LVM)


Command (m for help): p           打印分区表


Disk /dev/sda: 17.1 GB, 17179869184 bytes

255 heads, 63 sectors/track, 2088 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes


   Device Boot      Start         End      Blocks   Id  System

/dev/sda1   *           1          13      104391   83  Linux

/dev/sda2              14        1288    10241437+  8e  Linux LVM

/dev/sda3            1289        1549     2096482+  82  Linux swap / Solaris

/dev/sda4            1550        2088     4329517+  8e  Linux LVM


Command (m for help): w       命令w保存

The partition table has been altered!

Calling ioctl() to re-read partition table.


WARNING: Re-reading the partition table failed with error 16: 设备或资源忙.

The kernel still uses the old table.

The new table will be used at the next reboot.

Syncing disks.


[root@oracle ~]# fdisk -l


Disk /dev/sda: 17.1 GB, 17179869184 bytes

255 heads, 63 sectors/track, 2088 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes


   Device Boot      Start         End      Blocks   Id  System

/dev/sda1   *           1          13      104391   83  Linux

/dev/sda2              14        1288    10241437+  8e  Linux LVM

/dev/sda3            1289        1549     2096482+  82  Linux swap / Solaris

/dev/sda4            1550        2088     4329517+  8e  Linux LVM


格式化分区 mkfs -t ext3 /dev/sda4

[root@localhost ~]# mkfs -t ext3 /dev/sda4

mke2fs 1.39 (29-May-2006)

The device apparently does not exist; did you specify it correctly?


(此处需重启,增加硬盘则不用重启)


[root@localhost ~]# mkfs -t ext3 /dev/sda4

mke2fs 1.39 (29-May-2006)

Filesystem label=

OS type: Linux

Block size=4096 (log=2)

Fragment size=4096 (log=2)

541824 inodes, 1082379 blocks

54118 blocks (5.00%) reserved for the super user

First data block=0

Maximum filesystem blocks=1111490560

34 block groups

32768 blocks per group, 32768 fragments per group

15936 inodes per group

Superblock backups stored on blocks: 

32768, 98304, 163840, 229376, 294912, 819200, 884736


Writing inode tables: done                            

Creating journal (32768 blocks): done

Writing superblocks and filesystem accounting information: done


This filesystem will be automatically checked every 39 mounts or

180 days, whichever comes first.  Use tune2fs -c or -i to override.



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