- 查看磁盘空间大小, 使用
df -h命令:
[root@centos ~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 19G 19G 173M 100% /
devtmpfs 7.8G 0 7.8G 0% /dev
...
看到 /dev/mapper/centos-root 满了
- 增加磁盘空间后查看可用大小, 使用
fdisk -l命令 - 使用
fdisk /dev/vda，创建新分区
[root@centos ~]# fdisk /dev/vda
Welcome to fdisk (util-linux 2.23.2).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.
Command (m for help): n
Partition type:
p primary (3 primary, 0 extended, 1 free)
e extended
Select (default e): p
Selected partition 4
No free sectors available
Command (m for help):
发现无可用盘符，因为所有盘符被占满了
- 通过
fdisk -l查看下
[root@centos~]# fdisk -l
Disk /dev/vda: 128.8 GB, 128849018880 bytes, 251658240 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x00042553
Device Boot Start End Blocks Id System
/dev/vda1 2048 4095 1024 83 Linux
/dev/vda2 * 4096 2101247 1048576 83 Linux
/dev/vda3 2101248 6297599 2098176 82 Linux swap / Solaris
/dev/vda4 6297600 83886079 38794240 5 Extended
/dev/vda5 6299648 6561791 131072 6 FAT16
/dev/vda6 6563840 83886079 38661120 8e Linux LVM
发现vda3是交换分区，可以删除
- 执行
swapoff /dev/vda3关闭交换分区 - 执行
fdisk /dev/vda，进入磁盘管理，输入命令n， 再输入3删除/dev/vda3 - 再次执行步骤3创建新分区，创建完成后
reboot重启，不重启的话后面扩容只能扩2G - 创建物理卷, 执行
pvcreate /dev/vda3
[root@centos~]# pvcreate /dev/vda3
Physical volume "/dev/vda3" successfully created.
- 查看物理卷信息, 执行
pvdisplay命令
[root@centos~]# pvdisplay
"/dev/vda3" is a new physical volume of "984.00 GiB"
--- NEW Physical volume ---
PV Name /dev/vda3
VG Name
PV Size 984.00 GiB
Allocatable NO
PE Size 0
Total PE 0
Free PE 0
Allocated PE 0
PV UUID nUy8Gx-HcYl-gh19-nYPi-0uBi-rxXs-7HwnFX
- 将新增加的分区/dev/vda3加入到根目录分区centos中, 执行
vgextend centos /dev/vda3命令
[root@centos~]# vgextend centos /dev/vda3
Volume group "centos" successfully extended
- 查看卷组信息, 执行
vgdisplay命令
[root@centos~]# vgdisplay
--- Volume group ---
VG Name centos
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 4
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 2
Open LV 2
Max PV 0
Cur PV 2
Act PV 2
VG Size 1020.86 GiB
PE Size 4.00 MiB
Total PE 261341
Alloc PE / Size 9438 / <36.87 GiB
Free PE / Size 251903 / <984.00 GiB
VG UUID QV9fKw-Kp9p-Y20n-jWBj-yYG4-QW6M-s3D7Y5
- 增加centos大小, 增加900G，执行
lvresize -L +900G /dev/centos/root命令
[root@centos~]# lvresize -L +900G /dev/centos/root
Size of logical volume centos/root changed from 18.43 GiB (4719 extents) to 918.43 GiB (235119 extents).
Logical volume centos/root successfully resized.
- 重新识别centos大小，执行
xfs_growfs /dev/centos/root命令
[root@centos~]# xfs_growfs /dev/centos/root
meta-data=/dev/mapper/centos-root isize=512 agcount=4, agsize=1208064 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=4832256, 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 4832256 to 240761856
- 查看扩容后的大小, 执行
df -h命令
[root@centos~]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 919G 19G 901G 2% /
devtmpfs 7.8G 0 7.8G 0% /dev
...