linux分区大小调整

总结就是pvcreate创建pv，然后vgextend增加lvm大小，再lvextend增加lv_root大小，最后resize2fs就成功了[root@localhost 桌面]# pvcreate /dev/sda3

Physical volume "/dev/sda3" successfully created

[root@localhost 桌面]# pvdisplay

--- Physical volume ---

PV Name /dev/sda2

VG Name VolGroup

PV Size 7.80 GB / not usable 1.17 MB

Allocatable yes (but full)

PE Size (KByte) 4096

Total PE 1997

Free PE 0

Allocated PE 1997

PV UUID HtJXq0-Gloi-c6ou-VR3X-5SFz-GyD8-EMdMMZ

"/dev/sda3" is a new physical volume of "1019.75 MB"

--- NEW Physical volume ---

PV Name /dev/sda3

VG Name

PV Size 1019.75 MB

Allocatable NO

PE Size (KByte) 0

Total PE 0

Free PE 0

Allocated PE 0

PV UUID jrB6nN-u4aH-2NGy-E7X6-KoOq-aKvn-xhtov0

[root@localhost 桌面]# vgextend VolGroup /dev/sda3

Volume group "VolGroup" successfully extended

[root@localhost 桌面]# vgdisplay

--- Volume group ---

VG Name VolGroup

System ID

Formatlvm2

Metadata Areas2

Metadata Sequence No 5

VG Access read/write

VG Status resizable

MAX LV0

Cur LV2

Open LV 2

Max PV0

Cur PV2

Act PV2

VG Size 8.79 GB

PE Size 4.00 MB

Total PE 2251

Alloc PE / Size 1997 / 7.80 GB

Free PE / Size 254 / 1016.00 MB

VG UUID QXmNgn-tD5Q-Oz2D-g6pf-W9uf-cSIn-3vWImm

[root@localhost 桌面]# lvscan

ACTIVE'/dev/VolGroup/lv_root' [5.83 GB] inherit

ACTIVE'/dev/VolGroup/lv_swap' [1.97 GB] inherit

[root@localhost 桌面]# lvcreate -L 1G -n lv_new VolGroup

Insufficient free extents (254) in volume group VolGroup: 256 required

[root@localhost 桌面]# lvextend -L +1G /VolGroup/lv_root

"/VolGroup/lv_root": Invalid path for Logical Volume

Please provide a volume group name

Run `lvextend --help' for more information.

[root@localhost 桌面]# lvextend -L +1G /dev/VolGroup/lv_root

Extending logical volume lv_root to 6.83 GB

Insufficient free space: 256 extents needed, but only 254 available

[root@localhost 桌面]# lvextend -L +1018m /dev/VolGroup/lv_root

Rounding up size to full physical extent 1020.00 MB

Extending logical volume lv_root to 6.83 GB

Insufficient free space: 255 extents needed, but only 254 available

[root@localhost 桌面]# lvextend -L +1017m /dev/VolGroup/lv_root

Rounding up size to full physical extent 1020.00 MB

Extending logical volume lv_root to 6.83 GB

Insufficient free space: 255 extents needed, but only 254 available

[root@localhost 桌面]# lvextend -L +1016m /dev/VolGroup/lv_root

Extending logical volume lv_root to 6.82 GB

Logical volume lv_root successfully resized

[root@localhost 桌面]# lvscan

ACTIVE'/dev/VolGroup/lv_root' [6.82 GB] inherit

ACTIVE'/dev/VolGroup/lv_swap' [1.97 GB] inherit

[root@localhost 桌面]# pvresize -v /dev/sda2

Using physical volume(s) on command line

Archiving volume group "VolGroup" metadata (seqno 6).

No change to size of physical volume /dev/sda2.

Resizing volume "/dev/sda2" to 16361813 sectors.

Updating physical volume "/dev/sda2"

Creating volume group backup "/etc/lvm/backup/VolGroup" (seqno 7).

Physical volume "/dev/sda2" changed

1 physical volume(s) resized / 0 physical volume(s) not resized[root@localhost /]# resize2fs /dev/VolGroup/lv_root

resize2fs 1.41.9 (22-Aug-2009)

Filesystem at /dev/VolGroup/lv_root is mounted on /on-line resizing required

old desc_blocks = 1, new_desc_blocks = 1

Performing an on-line resize of /dev/VolGroup/lv_root to 1788928 (4k) blocks.

The filesystem on /dev/VolGroup/lv_root is now 1788928 blocks long.

增加硬盘、或新建分区

在硬盘或分区上创建物理卷PV，例如新硬盘为sdb

pvcreate

/dev/sdb

扩展卷组VG，例如：文件系统所在的VG名为vgname

vgextend

vgname

/dev/sdb

扩展逻辑卷LV，例如：文件系统所在的LV名为lvname，增加10G

lvextend

+L

10G

/dev/vgname/lvname

扩展文件系统

resize2fs

/dev/vgname/lvname

如果没用逻辑卷管理，文件系统是无法扩展的；如果逻辑卷有足够的剩余空间（vgdisplay可看），第1、2、3步可省略

     很多朋友都想知道linux如何修改分区的大小？下面就一起来看看吧！

      linux修改分区的大小

      1、使用ssh远程连接工具登录到系统，使用fdisk-l命令查看磁盘状态。

      2、输入fdisk/dev/hdb然后回车，给硬盘进行分区

      3、输入n回车新建分区，接着再输入p回车新建主分区。

      4、使用Firstcylinder(1-20805，default1)修改分区起始的柱面。

      5、最后可以输入p命令查看分区是否修改成功。

      本文章基于ThinkpadE15品牌、centos7系统撰写的。

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