centos7 lvm分区扩容

分区扩容有两种方法：
添加新硬盘
从其他分区拿空闲空间，本次演示这种

查看vgdisplay剩余空间

[root@localhost ~]# vgdisplay 
  --- Volume group ---
  VG Name               centos
  System ID             
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  6
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                3
  Open LV               3
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               <119.00 GiB
  PE Size               4.00 MiB
  Total PE              30463
  Alloc PE / Size       30462 / 118.99 GiB
  Free  PE / Size       1 / 4.00 MiB		空闲空间
  VG UUID               uDLmZJ-lh3c-belC-VASm-p26Y-T7VQ-LlcGxq

备份home目录

[root@localhost /]# tar -czvf home.tar.gz home

卸载home分区

[root@localhost /]# umount /home/	

将home的lv空间减小21G

[root@localhost /]# lvreduce -L -21G /dev/mapper/centos-home
  WARNING: Reducing active logical volume to 45.24 GiB.
  THIS MAY DESTROY YOUR DATA (filesystem etc.)
Do you really want to reduce centos/home? [y/n]: y
  Size of logical volume centos/home changed from 66.24 GiB (16958 extents) to 45.24 GiB (11582 extents).
  Logical volume centos/home successfully resized.

格式化分区

[root@localhost /]# mkfs.xfs /dev/mapper/centos-home -f
meta-data=/dev/mapper/centos-home isize=512    agcount=4, agsize=2964992 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0, sparse=0
data     =                       bsize=4096   blocks=11859968, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal log           bsize=4096   blocks=5791, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0

重新挂载home分区

[root@localhost /]# mount /dev/mapper/centos-home /home	

解压home.tar.gz

[root@localhost /]# pwd
/
[root@localhost /]# tar -zxvf home.tar.gz

将空闲空间给root分区
lvextend -L +21G /dev/mapper/centos-root
或
lvextend -L +100%FIEE /dev/mapper/centos-root

[root@localhost /]# lvextend -L +21G /dev/mapper/centos-root   或lvextend -L +100%FIRE /dev/mapper/centos-root
  Size of logical volume centos/root changed from 50.00 GiB (12800 extents) to 71.00 GiB (18176 extents).
  Logical volume centos/root successfully resized.

使用xfs_growfs命令刷新文件系统使用空间转移生效
注：xfs_growfs此命令只可增加，不能用于减小

[root@localhost /]# xfs_growfs /dev/mapper/centos-root
meta-data=/dev/mapper/centos-root isize=512    agcount=4, agsize=3276800 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0 spinodes=0
data     =                       bsize=4096   blocks=13107200, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal               bsize=4096   blocks=6400, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 13107200 to 18612224

查看结果

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[root@localhost /]# df -h
Filesystem               Size  Used Avail Use% Mounted on
devtmpfs                 657M     0  657M   0% /dev
tmpfs                    668M     0  668M   0% /dev/shm
tmpfs                    668M  9.3M  659M   2% /run
tmpfs                    668M     0  668M   0% /sys/fs/cgroup
/dev/mapper/centos-root   71G  2.0G   69G   3% /
/dev/sda1               1014M  137M  878M  14% /boot
tmpfs                    134M     0  134M   0% /run/user/0
/dev/mapper/centos-home   46G   33M   46G   1% /home

参与文档
Centos 7.5利用LVM实现动态扩容大小
https://blog.csdn.net/u010735147/article/details/84254926

centos7下使用LVM给系统硬盘扩容超详细
https://www.cnblogs.com/ding2016/p/9680690.html

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