Linux lvm 磁盘扩容
虚拟机 根目录扩容操作
[root@localhost ~]# df -lh
Filesystem Size Used Avail Use% Mounted on
devtmpfs 3.9G 0 3.9G 0% /dev
tmpfs 3.9G 0 3.9G 0% /dev/shm
tmpfs 3.9G 8.5M 3.9G 1% /run
tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup
/dev/mapper/centos-root 35G 1.9G 34G 6% /
/dev/vda2 1014M 150M 865M 15% /boot
tmpfs 783M 0 783M 0% /run/user/0
1、分区
[root@localhost ~]# 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 # n 新建分区
Partition type:
p primary (3 primary, 0 extended, 1 free)
e extended
Select (default e): p 权限创建一个主分区
Selected partition 4
First sector (75511808-209715199, default 75511808):
Using default value 75511808
Last sector, +sectors or +size{K,M,G} (75511808-209715199, default 209715199):
Using default value 209715199
Partition 4 of type Linux and of size 64 GiB is set
Command (m for help): t ## t 修改分区类型
Partition number (1-4, default 4): 4 #选择上面创建的分区id
Hex code (type L to list all codes): 8e # 8e 就是lvm格式的分区
Changed type of partition 'Linux' to 'Linux LVM'
Command (m for help): w #保存并退出
The partition table has been altered!
Calling ioctl() to re-read partition table.
WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table. The new table will be used at
the next reboot or after you run partprobe(8) or kpartx(8)
Syncing disks.
[root@localhost ~]# vgdisplay #查看卷组
--- Volume group ---
VG Name centos
System ID
Format lvm2
Metadata Areas 1
Metadata Sequence No 2
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 1
Open LV 1
Max PV 0
Cur PV 1
Act PV 1
VG Size 35.00 GiB
PE Size 4.00 MiB
Total PE 8960
Alloc PE / Size 8960 / 35.00 GiB
Free PE / Size 0 / 0
VG UUID MTYErK-tViu-6Cef-r9Da-k9LV-wJjM-9hLSXj
[root@localhost ~]# vgextend centos /dev/vda4 #将物理卷加入到卷组
Device /dev/vda4 not found.
[root@localhost ~]# partprobe # 无法读取分区，重启或者执行partprobe
[root@localhost ~]#
[root@localhost ~]#
[root@localhost ~]# vgextend centos /dev/vda4
Physical volume "/dev/vda4" successfully created.
Volume group "centos" successfully extended
[root@localhost ~]#
[root@localhost ~]# vgdisplay #查看卷组
--- Volume group ---
VG Name centos
System ID
Format lvm2
Metadata Areas 2
Metadata Sequence No 3
VG Access read/write
VG Status resizable
MAX LV 0
Cur LV 1
Open LV 1
Max PV 0
Cur PV 2
Act PV 2
VG Size 98.99 GiB
PE Size 4.00 MiB
Total PE 25342
Alloc PE / Size 8960 / 35.00 GiB
Free PE / Size 16382 / 63.99 GiB
VG UUID MTYErK-tViu-6Cef-r9Da-k9LV-wJjM-9hLSXj
[root@localhost ~]#
[root@localhost ~]#
[root@localhost ~]#
[root@localhost ~]# lvdisplay
--- Logical volume ---
LV Path /dev/centos/root
LV Name root
VG Name centos
LV UUID P1iSJx-KMPv-JYhc-9HpX-ABNr-h2K3-wpZzFD
LV Write Access read/write
LV Creation host, time localhost, 2021-11-23 16:03:58 +0800
LV Status available
# open 1
LV Size 35.00 GiB
Current LE 8960
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 8192
Block device 253:0
[root@localhost ~]# lvextend -l +100%FREE /dev/centos/root #加入剩余所有空间
Size of logical volume centos/root changed from 35.00 GiB (8960 extents) to 98.99 GiB (25342 extents).
Logical volume centos/root successfully resized.
# 重新识别分区大小
[root@localhost ~]# xfs_growfs /dev/centos/root
meta-data=/dev/mapper/centos-root isize=512 agcount=4, agsize=2293760 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=0 spinodes=0
data = bsize=4096 blocks=9175040, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=1
log =internal bsize=4096 blocks=4480, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
data blocks changed from 9175040 to 25950208
#验证磁盘空间
[root@localhost ~]# df -lh
Filesystem Size Used Avail Use% Mounted on
devtmpfs 3.9G 0 3.9G 0% /dev
tmpfs 3.9G 0 3.9G 0% /dev/shm
tmpfs 3.9G 8.5M 3.9G 1% /run
tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup
/dev/mapper/centos-root 99G 1.9G 98G 2% /
/dev/vda2 1014M 150M 865M 15% /boot
tmpfs 783M 0 783M 0% /run/user/0