虚拟机Centos7扩展系统磁盘空间
查看磁盘并创建新分区
查看磁盘情况
fdisk -l
Disk /dev/sda: 85.9 GB, 85899345920 bytes, 167772160 sectors
#磁盘大小
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: 0x000bea13
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 83886079 40893440 8e Linux LVM
Disk /dev/mapper/centos-root: 39.7 GB, 39720058880 bytes, 77578240
#分区大小
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 /dev/mapper/centos-swap: 2147 MB, 2147483648 bytes, 4194304 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
创建新分区
fdisk /dev/sda
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 #n创建新分区
Partition type:
p primary (2 primary, 0 extended, 2 free)
e extended
Select (default p): p #p分区类型
Partition number (3,4, default 3): #直接回车
First sector (83886080-167772159, default 83886080): #直接回车
Using default value 83886080
Last sector, +sectors or +size{K,M,G} (83886080-167772159, default 167772159): #直接回车
Using default value 167772159
Partition 3 of type Linux and of size 40 GiB is set
Command (m for help): w #w保存并退出
The partition table has been altered!
Calling ioctl() to re-read partition table.
重新启动电脑
再次查看分区
fdisk -l
Disk /dev/sda: 85.9 GB, 85899345920 bytes, 167772160 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: 0x000bea13
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 2099199 1048576 83 Linux
/dev/sda2 2099200 83886079 40893440 8e Linux LVM
/dev/sda3 83886080 167772159 41943040 83 Linux
#新增加磁盘分区 /dev/sda3 ,创建物理卷时使用
Disk /dev/mapper/centos-root: 39.7 GB, 39720058880 bytes, 77578240 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 /dev/mapper/centos-swap: 2147 MB, 2147483648 bytes, 4194304 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
创建物理卷并扩展卷组
查看卷组名称及大小
vgdisplay
--- Volume group ---
VG Name centos #名称
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 3
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 <39.00 GiB大 #当前大小
PE Size 4.00 MiB
Total PE 9983
Alloc PE / Size 9982 / 38.99 GiB #已分配
Free PE / Size 1 / 4.00 MiB #空闲大小扩展分区时使用
VG UUID HxuBfE-HjMo-oukD-Xx5T-g6zH-gjfE-pT48Kl
创建卷
pvcreate /dev/sda3
Physical volume "/dev/sda3" successfully created
扩展卷组
vgextend centos /dev/sda3
Volume group "centos" successfully extended
查看物理卷
pvdisplay
--- Physical volume ---
PV Name /dev/sda2
VG Name centos
PV Size <39.00 GiB / not usable 3.00 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 9983
Free PE 1
Allocated PE 9982
PV UUID 1syFwI-rpjc-O1Ws-xGql-GC3o-tAml-OQIDsb
--- Physical volume ---
PV Name /dev/sda3
VG Name centos
PV Size 40.00 GiB / not usable 4.00 MiB
Allocatable yes
PE Size 4.00 MiB
Total PE 10239
Free PE 10239
Allocated PE 0
PV UUID wdIz6w-kwrN-BfcE-ECB1-JtdQ-PB5a-vcK0Eo
扩展逻辑卷
查看磁盘分区大小
df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 37G 1.5G 36G 5% / #需要扩展的分区
devtmpfs 7.8G 0 7.8G 0% /dev
tmpfs 7.8G 0 7.8G 0% /dev/shm
tmpfs 7.8G 8.8M 7.8G 1% /run
tmpfs 7.8G 0 7.8G 0% /sys/fs/cgroup
/dev/sda1 1014M 265M 750M 27% /boot
tmpfs 1.6G 0 1.6G 0% /run/user/0
查看当前逻辑卷的名称及空间大小
lvdisplay
--- Logical volume ---
LV Path /dev/centos/swap
LV Name swap
VG Name centos
LV UUID 4PsjOD-0ASJ-ksHY-cK0w-HScG-Kg71-oGTMF3
LV Write Access read/write
LV Creation host, time localhost, 2018-05-15 05:16:38 -0400
LV Status available
# open 2
LV Size 2.00 GiB
Current LE 512
Segments 1
Allocation inherit
Read ahead sectors auto
1. currently set to 8192
Block device 253:1
--- Logical volume ---
LV Path /dev/centos/root #需要扩展的逻辑卷
LV Name root
VG Name centos
LV UUID h2q8Cv-Whlf-3Aav-80bd-14XC-1Cfg-wviAPB
LV Write Access read/write
LV Creation host, time localhost, 2018-05-15 05:16:39 -0400
LV Status available
# open 1
LV Size 36.99 GiB
Current LE 9470
Segments 1
Allocation inherit
Read ahead sectors auto
2. currently set to 8192
Block device 253:0
扩展分区大小
扩展分区
lvextend -l +10240 /dev/centos/root
+10240本次增加的容量，数值见查看卷组名称及大小vgdisplay
Size of logical volume centos/root changed from <40.90 GiB (10470 extents) to 76.99 GiB (19710 extents).
Logical volume centos/root successfully resized.
下面这步有可能不需要
调整文件系统大小 ext2、ext3、ext4文件系统
resize2fs -f /dev/centos/root
调整文件系统大小 xfs文件系统
xfs_growfs /dev/centos/root
查询分区大小
df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/centos-root 77G 1.5G 76G 2% / #大小已经调整到位
devtmpfs 7.8G 0 7.8G 0% /dev
tmpfs 7.8G 0 7.8G 0% /dev/shm
tmpfs 7.8G 8.8M 7.8G 1% /run
tmpfs 7.8G 0 7.8G 0% /sys/fs/cgroup
/dev/sda1 1014M 265M 750M 27% /boot
tmpfs 1.6G 0 1.6G 0% /run/user/0