linux调整lvm分区大小

时间 2019-11-06

标签 linux 调整 lvm 分区大小栏目 Linux 繁體版

原文原文链接

最近开始捣鼓linux，把开发环境转到linux上。。。因为本人有怪癖。。不喜欢集成包。。因此apache+php+mysql相关的开发环境都是手动编译的。。

在安装centos的时候因为对分区不熟悉，选择了默认分区，致使在安装mysql的时候，没有一个单独的分区来存放data。只能研究下如何调整lvm卷的大小了。。php

用vgdisplay指令查看vg卷的大小node

[root@localhost caoyong]# vgdisplay
  --- Volume group ---
  VG Name               vg_centoscy
  System ID             
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  8
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                4
  Open LV               4
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               465.27 GiB
  PE Size               4.00 MiB
  Total PE              119109
  Alloc PE / Size       119109 / 465.27 GiB
  Free  PE / Size       0 / 0   
  VG UUID               LKnVzD-DeMj-Fonv-zR9Z-vCHs-1TMl-2ELian

VG Name 卷组名称
Alloc PE / Size 卷组总空间

Free PE / Size 卷组剩余空间mysql

vg_centoscy卷组中已经没有剩余空间让我分割给其余lvm，所以咱们要从其余lvm中分割一部分空间出来linux

使用lvdisplay指令查看vg_centoscy到lvm分配状况sql

[root@localhost caoyong]# lvdisplay vg_centoscy
  --- Logical volume ---
  LV Path                /dev/vg_centoscy/lv_root
  LV Name                lv_root
  VG Name                vg_centoscy
  LV UUID                4rlwmS-6ZZT-nGFE-aKgl-KZaW-FlUn-fMA9of
  LV Write Access        read/write
  LV Creation host, time centos-cy, 2010-01-04 10:42:37 +0800
  LV Status              available
  # open                 1
  LV Size                50.00 GiB
  Current LE             12800
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0
   
  --- Logical volume ---
  LV Path                /dev/vg_centoscy/lv_home
  LV Name                lv_home
  VG Name                vg_centoscy
  LV UUID                IknYf3-lhXg-3qAU-kEum-Nhyj-2kiZ-SBdmHg
  LV Write Access        read/write
  LV Creation host, time centos-cy, 2010-01-04 10:42:47 +0800
  LV Status              available
  # open                 1
  LV Size                400.00 GiB
  Current LE             102400
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:2
   
  --- Logical volume ---
  LV Path                /dev/vg_centoscy/lv_swap
  LV Name                lv_swap
  VG Name                vg_centoscy
  LV UUID                8pOAL1-o0kr-0glK-jJve-G6Oo-8mZM-DHxgPE
  LV Write Access        read/write
  LV Creation host, time centos-cy, 2010-01-04 10:44:04 +0800
  LV Status              available
  # open                 1
  LV Size                3.72 GiB
  Current LE             952
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:1
   
  --- Logical volume ---
  LV Path                /dev/vg_centoscy/data
  LV Name                data
  VG Name                vg_centoscy
  LV UUID                p0X3ih-jDiQ-GN3B-R9Zd-U8qI-loSF-Sql6sc
  LV Write Access        read/write
  LV Creation host, time localhost.localdomain, 2012-12-28 13:07:42 +0800
  LV Status              available
  # open                 1
  LV Size                11.55 GiB
  Current LE             2957
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:3

能够看到，lv_home的空间所最多的，路径为/dev/vg_centoscy/lv_home，在安装系统的时候，lv_home卷是挂载到/home的，因而决定从这个最大到lvm中分割一部分空间出来

lvm的空间调整指令是apache

lvextend 增长lvm空间centos

lvreduce 减小lvm空间dom

这里使用-L 参数指定须要调整到大小ide

例如lvextend -L 450G /dev/vg_centoscy/lv_home 表示将lv_home卷的大小调整到450G，前提是vg中有足够的空间。注意，lvextend指令所指定到大小必须大于须要调整到lvm的大小spa

-L指令也能够用 + 来调整大小表示当前空间须要增长到大小好比 -L +50G 表示lv_home卷的空间调整为400G+50G

lvreduce指令跟lvextend指令彻底相反，这里就不仔细说明了

[root@localhost caoyong]# lvreduce -L -10G -f /dev/vg_centoscy/lv_home
  WARNING: Reducing active and open logical volume to 390.00 GiB
  THIS MAY DESTROY YOUR DATA (filesystem etc.)
  Reducing logical volume lv_home to 390.00 GiB
  Logical volume lv_home successfully resized

执行指令以后，lv_home的空间已经降低到390G，咱们能够用lvdisplay来查看

接下来建立新的lvm

lvmcreate -L 10G -n mylvm /dev/vg_centoscy

[root@localhost caoyong]# lvcreate -L 10G -n mylvm /dev/vg_centoscy
  Logical volume "mylvm" created

在vg_centoscy卷组中建立mylvm卷，咱们使用lvdisplay指令查看，mylvm卷已经建立完成，接下来要将lvm挂载到linux的 / 中

建立/mylvm 分区

[root@localhost caoyong]# mkdir /mylvm

格式化mylvm卷

[root@localhost caoyong]# mke2fs -j -t ext4 /dev/vg_centoscy/mylvm
mke2fs 1.41.12 (17-May-2010)
文件系统标签=
操做系统:Linux
块大小=4096 (log=2)
分块大小=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
655360 inodes, 2621440 blocks
131072 blocks (5.00%) reserved for the super user
第一个数据块=0
Maximum filesystem blocks=2684354560
80 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks: 
	32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632

正在写入inode表: 完成                            
Creating journal (32768 blocks): 完成
Writing superblocks and filesystem accounting information: 完成

This filesystem will be automatically checked every 35 mounts or
180 days, whichever comes first.  Use tune2fs -c or -i to override.

挂载mylvm卷到/mylvm分区

[root@localhost caoyong]# mount -t ext4 /dev/vg_centoscy/mylvm /mylvm

到这里，lvm卷的分割，建立和挂载完成。

上述mylvm卷是在写博文时查看指令和运行结果所临时分割的空间，data卷是以前操做中分割给mysql做为数据储存用的空间。本人初学linux，有什么遗漏到地方但愿有人指正