linux系统根目录扩容

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VMware的虚机根目录空间不足，添加一个100g磁盘，然后给根目录进行磁盘扩展

原磁盘：/dev/sda 20g

新磁盘：/dev/sdb 100g

[root@server ~]# df -Th
Filesystem              Type      Size  Used Avail Use% Mounted on
/dev/mapper/centos-root xfs        17G  8.7G  8.4G  51% /
devtmpfs                devtmpfs  1.5G     0  1.5G   0% /dev
tmpfs                   tmpfs     1.5G     0  1.5G   0% /dev/shm
tmpfs                   tmpfs     1.5G   11M  1.5G   1% /run
tmpfs                   tmpfs     1.5G     0  1.5G   0% /sys/fs/cgroup
/dev/sda1               xfs      1014M  137M  878M  14% /boot
tmpfs                   tmpfs     300M  4.0K  300M   1% /run/user/42
tmpfs                   tmpfs     300M   28K  300M   1% /run/user/1000
/dev/sr0                iso9660   4.2G  4.2G     0 100% /run/media/qmc/CentOS 7 x86_64

[root@server ~]# pvcreate /dev/sdb
  Physical volume "/dev/sdb" successfully created.
 [root@server ~]# vgs     #查看当前卷组名centos
  VG     #PV #LV #SN Attr   VSize   VFree
  centos   1   2   0 wz--n- <19.00g    0 
[root@server ~]# vgextend  centos /dev/sdb
  Volume group "centos" successfully extended
[root@server ~]# vgs
  VG     #PV #LV #SN Attr   VSize   VFree   
  centos   2   2   0 wz--n- 118.99g <100.00g
[root@server ~]# lvextend /dev/centos/root /dev/sdb 
  Size of logical volume centos/root changed from <17.00 GiB (4351 extents) to 116.99 GiB (29950 extents).
  Logical volume centos/root successfully resized.
[root@server ~]# xfs_growfs /dev/mapper/centos-root 
meta-data=/dev/mapper/centos-root isize=512    agcount=4, agsize=1113856 blks
         =                       sectsz=512   attr=2, projid32bit=1
         =                       crc=1        finobt=0 spinodes=0
data     =                       bsize=4096   blocks=4455424, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=1
log      =internal               bsize=4096   blocks=2560, version=2
         =                       sectsz=512   sunit=0 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0
data blocks changed from 4455424 to 30668800
[root@server ~]# df -Th
Filesystem              Type      Size  Used Avail Use% Mounted on
/dev/mapper/centos-root xfs       117G  8.7G  109G   8% /
devtmpfs                devtmpfs  1.5G     0  1.5G   0% /dev
tmpfs                   tmpfs     1.5G     0  1.5G   0% /dev/shm
tmpfs                   tmpfs     1.5G   11M  1.5G   1% /run
tmpfs                   tmpfs     1.5G     0  1.5G   0% /sys/fs/cgroup
/dev/sda1               xfs      1014M  137M  878M  14% /boot
tmpfs                   tmpfs     300M  4.0K  300M   1% /run/user/42
tmpfs                   tmpfs     300M   28K  300M   1% /run/user/1000
/dev/sr0                iso9660   4.2G  4.2G     0 100% /run/media/qmc/CentOS 7 x86_64