这周六日研究LVM的笔记，下面图示很好的解释了一切，网上找的。

basic-lvm-volume

创建LVM

pvcreate

vgcreate

lvcreate

(mke2fs)

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# pvcreate /dev/hda5
pvcreate — physical volume “/dev/hda5″ successfully created

# vgcreate main /dev/hda5
vgcreate — INFO: using default physical extent size 4 MB
vgcreate — INFO: maximum logical volume size is 255.99 Gigabyte
vgcreate — doing automatic backup of volume group “main”
vgcreate — volume group “main” successfully created and activated

# lvcreate –L 8G lv_home main
lvcreate — doing automatic backup of “main”
lvcreate — logical volume “/dev/main/lv_home” successfully created

# mke2fs –j /dev/main/lv_home

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增减vg

# vgextend vg00 /dev/sda4

# vgreduce rootvg /dev/hda3

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增减lv （可以在线）

# lvextend -L +100M /dev/vg0/lv0

# resize2fs

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（必须离线）

# fsck -f

# resize2fs

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查看LVM

pvdisplay
vgdisplay
lvdisplay