LVM分区

1、PV

（1）创建PV，保证分区类型system是LVM ： pvcreate

   Device Boot      Start         End      Blocks   Id  Syste
/dev/sdb1               1         132     1060258+  8e  Linux LVM
/dev/sdb2             133         264     1060290   8e  Linux LVM
/dev/sdb3             265         396     1060290   8e  Linux LVM
# pvcreate /dev/sdb1  #创建PV
# pvcreate /dev/sdb2
# pvcreate /dev/sdb3

（2）查看PV： pvscan || pvdisplay

[root@NC ~]# pvscan
  PV /dev/sda2   VG vg_nc   lvm2 [557.88 GiB / 43.88 GiB free]
  Total: 1 [557.88 GiB] / in use: 1 [557.88 GiB] / in no VG: 0 [0   ]
[root@NC ~]#
[root@NC ~]# pvdisplay
  --- Physical volume ---
  PV Name               /dev/sda2
  VG Name               vg_nc
  PV Size               557.89 GiB / not usable 3.00 MiB
  Allocatable           yes
  PE Size               4.00 MiB
  Total PE              142818
  Free PE               11234
  Allocated PE          131584
  PV UUID               1gp3dE-wr7V-W3Jr-JfMq-zCTY-WyAf-3rk14m

（3）删除PV： pvremove

pvremove /dev/sdb1

2、VG

（1）创建VG：vgcreate

vgcreate volume-group1 /dev/sdb1 /dev/sdb2 /dev/sdb3  #设定vg名称，指定使用到的PV

（2）查看VG：vgscan || vgdisplay

[root@NC ~]# vgscan
  Reading all physical volumes.  This may take a while...
  Found volume group "vg_nc" using metadata type lvm2
[root@NC ~]#
[root@NC ~]# vgdisplay
  --- Volume group ---
  VG Name               vg_nc
  System ID            
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  7
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                3
  Open LV               3
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               557.88 GiB
  PE Size               4.00 MiB
  Total PE              142818
  Alloc PE / Size       131584 / 514.00 GiB
  Free  PE / Size       11234 / 43.88 GiB
  VG UUID               T8BWIA-peD0-aBiN-6vUi-2Cdu-AnTE-UvVltj

（3）删除VG：vgremove

 vgremove volume-group1

3、LV

（1）创建LV： lvcreate

lvcreate -L 100M -n lv1 volume-group1    #指定大小和名字

（2）查看LV：lvscan || lvdisplay

[root@NC ~]# lvscan
  ACTIVE            '/dev/vg_nc/lv_root' [110.00 GiB] inherit
  ACTIVE            '/dev/vg_nc/lv_swap' [4.00 GiB] inherit
  ACTIVE            '/dev/vg_nc/lv_home' [400.00 GiB] inherit
[root@NC ~]#
[root@NC ~]# lvdisplay
  --- Logical volume ---
  LV Path                /dev/vg_nc/lv_root
  LV Name                lv_root
  VG Name                vg_nc
  LV UUID                C4Ya0w-qROH-vzIy-hyf2-Srfi-I2DE-r0aT89
  LV Write Access        read/write
  LV Creation host, time NC, 2017-09-20 16:36:22 +0800
  LV Status              available
  # open                 1
  LV Size                110.00 GiB
  Current LE             28160
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           253:0

（3）删除LV： lvremove

lvremove /dev/volume-group1/lv1

4、创建文件系统：格式化LV

mkfs.ext4 /dev/volume-group1/lv1

5、扩展LV大小

（1）/dev/volume-group1/lv1     #umount对应LV
（2）lvresize -L 200M /dev/volume-group1/lv1   # 在保证LV所属VG还有剩余空间的前提下进行扩容；  -L  N 扩容到N； -L +N  增加N
（3） e2fsck -f /dev/volume-group1/lv1     #检测磁盘
（4）resize2fs /dev/volume-group1/lv1    #更新分区信息

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