vgrename

       刚才装ubuntu12.04 server版本的时候 硬盘做lvm的时候vgname写错了。然后ubuntu 本身的系统在vg里面。以为硬盘无法卸载无法修改vgname 很傻很天真的以为要重装系统了。
后来查了下。还好没有白白浪费时间。命令很简单 如下：

leslie@Notebook:~$ sudo vgdisplay
[sudo] password for ihaveu:
  --- Volume group ---
  VG Name               vgleslie
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  5
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                4
  Open LV               4
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               278.63 GiB
  PE Size               4.00 MiB
  Total PE              71330
  Alloc PE / Size       71330 / 278.63 GiB
  Free  PE / Size       0 / 0
  VG UUID               lAeYPZ-AV1M-278w-ddzQ-Oo7u-QNeg-b7o0z2

leslie@Notebook:~$ sudo vgrename vgleslie vgNotebook  Volume group "vgRoot" successfully renamed to "vgHadoop130"
ihaveu@hadoop130:~$ sudo vgdisplay   --- Volume group ---  VG Name               vgNotebook  System ID               Format                lvm2  Metadata Areas        1  Metadata Sequence No  6  VG Access             read/write  VG Status             resizable  MAX LV                0  Cur LV                4  Open LV               4  Max PV                0  Cur PV                1  Act PV                1  VG Size               278.63 GiB  PE Size               4.00 MiB  Total PE              71330  Alloc PE / Size       71330 / 278.63 GiB  Free  PE / Size       0 / 0     VG UUID               lAeYPZ-AV1M-278w-ddzQ-Oo7u-QNeg-b7o0z2

成功了。