linux 激活vg

解决挂载旧硬盘后无法识别lvm
vgscan    找到VolGroup00
vgchange -a y VolGroup00 激活

ex:
[root@rac1 dev]# vgscan
  Reading all physical volumes.  This may take a while...
  /dev/cdrom: open failed: Read-only file system
  Attempt to close device '/dev/cdrom' which is not open.
  Found volume group "omsvg" using metadata type lvm2
[root@rac1 dev]# vgchange -a y omsvg
  1 logical volume(s) in volume group "omsvg" now active

 vgchange - change attributes of a volume group
 -a, --available [e|l]{y|n}

 vgscan - scan all disks for volume groups and rebuild caches

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