LVM 是逻辑盘卷管理(Logical Volume Manager)的简称

LVM 通过在硬盘和分区之间建立一个逻辑层，可以让多个分区或者物理硬盘作为一个逻辑卷 ( 相当于一个逻辑硬盘 )，提高了磁盘分区管理的灵活性。 物理卷 physical volumes(PV) 逻辑卷 logical volumes(LV) 卷组 logical volume group(VG)

PhysicalVolume VolGroup00

dd if=/dev/zero of=PhysicalVolume bs=512 count=1

pvcreate /dev/sdd1 /dev/sde1 /dev/sdf1
pvcreate /dev/hdb1
pvcreate /dev/sdb
pvremove

pvs --all
pvdisplay
pvscan
vgs --all
vgdisplay
vgscan
lvs --all
lvdisplay
lvscan

vgs -v
vgdisplay
vgremove

pvscan
vgscan
lvscan

lvmdiskscan
pvs -o+pv_used

pvs — report information about physical volumes vgs — report information about volume groups lvs — report information about logical volumes vgdisplay — display attributes of volume groups pvmove — move physical extents

Linux LVM 8e

shell> fdisk -c /dev/sdb

shell> pvcreate /dev/sdb1
shell> pvdisplay /dev/sdb1

shell> vgextend vg1 /dev/sdb1
shell> vgdisplay vg1

shell> lvscan
shell> lvdisplay -v
shell> lvresize -l +100%FREE /dev/myvg/testlv
shell> lvresize -l +100%PVS /dev/myvg/testlv /dev/sdb1 
shell> resize2fs -p /mount/device node

shell> lsblk

100%FREE 100%VG 100%PVS

shell> pvmove /dev/sdb1
shell> vgreduce myvg /dev/sdb1

shell> pvdisplay /dev/hda1
shell> vgreduce my_volume_group /dev/hda1
shell> pvmove /dev/sdb1 /dev/sdc1

lvm

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