Basic use of LVM

 

LVM hierarchy (bottom to top ):

Ext3-> lv (logical volumn)-> pv (physical volumn)-> vg (volumn group)

 

LVM creation steps (for example, creating LVM on/dev/sdb ):

1. format the hard disk: fdisk/dev/sdb

N: Create a new disk partition (which can be a primary partition or an extended partition)

T: Change the partition to the Linux LVM format. The format is 8e.

W: Write and modify the above operations

 

2. Create pv: pvcreate/dev/sdb1

3. Create vg: vgcreate testvg/dev/sdb1

4. Create lv: lvcreate-L20G-n testlv testvg

5. Format lv: mkfs. ext3/dev/testvg/testlv

6. Complete

 

It is not recommended to use the lvreduce command to narrow down the lv partition. After multiple attempts, errors often occur in e2fsck-f.

 

Use the lvextend command to expand the lv partition:

1. lvextend-L + 20G/dev/testvg/testlv

2. e2fsck-f/dev/testvg/testlv

3. resize2fs/dev/testvg/testlv