--- 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 931.02 GiB
PE Size 4.00 MiB
Total PE 238341
Alloc PE / Size 238325 / 930.96 GiB
Free PE / Size 16 / 64.00 MiB
VG UUID IFQnYm-fCLh-38mD-Duid-nYXQ-qktX-3F1atk
lvdisplay //查看逻辑卷情况,默认三个,root、home和交换空间swap
--- Logical volume ---
LV Path /dev/centos/swap
LV Name swap
VG Name centos
LV UUID FGrPuO-2T02-1OfG-0dcz-oVTy-qcsh-IxEmd4
LV Write Access read/write
LV Creation host, time localhost, 2015-11-11 04:46:00 +0800
LV Status available
# open 2
LV Size 7.75 GiB
Current LE 1984
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:1
--- Logical volume ---
LV Path /dev/centos/home
LV Name home
VG Name centos
LV UUID x7Oh0t-6R1x-ey7G-G5OX-PnBO-VI0C-kcRuvO
LV Write Access read/write
LV Creation host, time localhost, 2015-11-11 04:46:01 +0800
LV Status available
# open 1
LV Size 873.21 GiB
Current LE 223541
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:2
--- Logical volume ---
LV Path /dev/centos/root
LV Name root
VG Name centos
LV UUID PgscNL-rvyY-21Z1-tVe3-80vC-ONCw-VlvmYs
LV Write Access read/write
LV Creation host, time localhost, 2015-11-11 04:46:04 +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
Do you really want to remove active logical volume home? [y/n]: y
Logical volume "home" successfully removed
vgdisplay //查看卷组可用空间
--- Volume group ---
VG Name centos
System ID
Format lvm2
Metadata Areas 1
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 1
Act PV 1
VG Size 931.02 GiB
PE Size 4.00 MiB
Total PE 238341
Alloc PE / Size 14784 / 57.75 GiB
Free PE / Size 223557 / 873.27 GiB
VG UUID IFQnYm-fCLh-38mD-Duid-nYXQ-qktX-3F1atk
这里注意,Free PE / Size 中显示的空间为卷组的空闲空间873G,之前为64M,也就是刚才删除的逻辑卷home所占用的空间,我们就从这个当中拿出一部分比如50G作为home
新建一个卷home,fdisk格式化为8e格式,文件系统还是搞为xfs(同样挂载到/home)
lvcreate -L 50G -n home centos //L表示大小,默认单位为M;n表示卷名;这里的centos是CentOS7安装系统的时候就默认建立好的卷组名
WARNING: xfs signature detected on /dev/centos/home at offset 0. Wipe it? [y/n]: y
Wiping xfs signature on /dev/centos/home.
Logical volume "home" created.
lvdisplay //查看逻辑卷home
--- Logical volume ---
LV Path /dev/centos/home
LV Name home
VG Name centos
LV UUID b5lLlv-FQPY-dT43-SmzV-sSLA-4QqP-gdQqAP
LV Write Access read/write
LV Creation host, time localhost, 2015-11-13 14:05:06 +0800
LV Status available
# open 0
LV Size 50.00 GiB
Current LE 12800
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:2
vgdisplay //再次查看卷组空间大小
--- Volume group ---
VG Name centos
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 8
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 3
Open LV 2
Max PV 0
Cur PV 1
Act PV 1
VG Size 931.02 GiB
PE Size 4.00 MiB
Total PE 238341
Alloc PE / Size 27584 / 107.75 GiB
Free PE / Size 210757 / 823.27 GiB
VG UUID IFQnYm-fCLh-38mD-Duid-nYXQ-qktX-3F1atk
Size of logical volume centos/root changed from 50.00 GiB (12800 extents) to 873.00 GiB (223488 extents).
Logical volume root successfully resized
lvdisplay //查看逻辑卷和卷组情况,这下root的空间就多达到873G,之前的是50G
--- Logical volume ---
LV Path /dev/centos/root
LV Name root
VG Name centos
LV UUID PgscNL-rvyY-21Z1-tVe3-80vC-ONCw-VlvmYs
LV Write Access read/write
LV Creation host, time localhost, 2015-11-11 04:46:04 +0800
LV Status available
# open 1
LV Size 873.00 GiB
Current LE 223488
Segments 2
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:0
如图可以看到该设备的home目录无法正常打开 重启也没用。 这种情况怎么办呢?
首先,修改 /etc/fstab启动项
将挂载home目录的命令注释掉
然后开始格式化home目录
df -h //查看磁盘使用情况,逻辑卷的挂载格式为/dev/mapper/VolumeGroupName-LogicalVolumeName
cat /etc/fstab
vgdisplay //查看逻辑卷组情况
lvdisplay //查看逻辑卷情况,默认三个,root、home和交换空间swap
备份/home中的用户数据 [root@localhost /]# mkdir /backup && mv /home/* /backup [root@localhost /]# ls /home/
卸载这个/home并删除逻辑卷home
umount /home
df -h //查看磁盘情况
lvremove /dev/centos/home //删除逻辑卷home
vgdisplay //查看卷组可用空间
这里注意,Free PE / Size 中显示的空间为卷组的空闲空间873G,之前为64M,也就是刚才删除的逻辑卷home所占用的空间,我们就从这个当中拿出一部分比如50G作为home
新建一个卷home,fdisk格式化为8e格式,文件系统还是搞为xfs(同样挂载到/home)
lvcreate -L 50G -n home centos //L表示大小,默认单位为M;n表示卷名;这里的centos是CentOS7安装系统的时候就默认建立好的卷组名
lvdisplay //查看逻辑卷home
vgdisplay //再次查看卷组空间大小
[# vgchange -ay centos //可选步骤:激活卷组centos,使得这个新建的home逻辑卷生效(用vgchange而不用lvchange)]
3 logical volume(s) in volume group "centos" now active
mkfs -t xfs /dev/centos/home //在新建的逻辑卷home上建立xfs文件系统
mount /dev/centos/home /home/ //把这个新逻辑卷home挂到之前的文件夹/home中去,直接重启用fstab来挂载也行
df -h //现在来查看磁盘使用情况
mv /backup/* /home/ //再把之前拷出来的东西拷回新建的/home中,拷贝完成就可以直接用这个普通用户来桌面登录系统了,不用重启
最后再把释放出来多余的空间分配给root卷并xfs_growfs扩展文件系统
lvextend -L +823G /dev/centos/root //把剩下的823G现在分配给root卷,剩下那点渣渣空间让它闲着;+号表示在原来的基础上额外增加,不要加好则设定为具体额度
lvdisplay //查看逻辑卷和卷组情况,这下root的空间就多达到873G,之前的是50G
[# vgchange -ay centos //可选步骤:再次激活下卷组centos]
df -h //不使用xfs_growfs扩展文件系统,磁盘是不认得多的空间的
xfs_growfs /dev/centos/root //扩展root卷
df -h //再看root大小已经生效,800多G了