Disk expansion process and problems encountered in the virtual machine created by VMWare

One . Yes VMware The disk expansion process of the created virtual machine

1. Virtual machine expansion disk capacity

2. Extended operating system disk

2.1 View the disk capacity information before expansion

lsblk

2.2 Partition the newly added disk

fdisk /dev/sda

Two default carriage returns are entered later , Not shown in the figure above

2.3 Restart the virtual machine

shutdown -r now

2.4 Format the new disk

mkfs.ext4 /dev/sda4

2.5 New LVM Add to existing LVM Group （ If not before , Create ）, Realize capacity expansion

2.5.1 Not before LVM Group , Now create LVM Group ：

1. Create a volume group centos：

vgcreate centos /dev/sda4

2. Create physical volumes and volume groups ：

pvcreate /dev/sda4

3. Create logical volumes ：

lvcreate -L 10236 centos

Here you can rewrite lv The name of the volume （ I haven't changed ）:

lvrename centos lvol0 lvrename( This is a rewritten name )

4. Logic volume lvol0 Make a file system ：

mkfs.ext4 /dev/centos/lvol0

5. Mount the logical volume to /data Catalog

mkdir -p /data && mount -t ext4 /dev/centos/lvol0 /data

see ：

2.5.2 If there are already LVM：

Expand the capacity according to the following command ：

pvcreate /dev/sda4

vgextend centos /dev/sda4

lvextend -L +42G /dev/mapper/centos-root 

xfs_growfs /dev/mapper/centos-root

Two . Mistakes encountered

error 1 and 2 It's all because I didn't originally LVM As a result of .

error 1. Volume group “centos” not found Cannot process volume group centos

Report errors ：
[[email protected] ~]# vgextend centos /dev/sda4
Volume group “centos” not found
Cannot process volume group centos
[[email protected] ~]# vgdisplay -v
No volume groups found.

solve ：
[[email protected] ~]# vgcreate centos /dev/sda4
Volume group “centos” successfully created

Modification successful

error 2. Logical volume root not found in volume group centos.

[[email protected] ~]# lvextend -L +29G /dev/mapper/centos-root
Logical volume root not found in volume group centos.

[[email protected] ~]# lvextend -L +29G /dev/sda4
“/dev/sda4”: Invalid path for Logical Volume.
Run `lvextend --help’ for more information.
[[email protected] ~]# lvcreate -L 10236 centos
Logical volume “lvol0” created.

error 3. Insufficient free space: 7424 extents needed, but only 5121 available

[[email protected] ~]# lvextend -L +29G /dev/mapper/centos-lvol0
Insufficient free space: 7424 extents needed, but only 5121 available

analysis ：
The set expansion size exceeds its own free size .
perform pvdisplay You can see /dev/sda3 Usable PE The total quantity is 7689, Leisure is 5121, And each PE Size is 4.00MiB, So the actual free space of this volume group is not displayed ,, It is ：（5121 * 4 ）/ 1024 =20.00390625G .

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