停电导致aix文件系统挂载问题
今天机房停电了，ups供电能力不足，于是把一个阵列关掉了，当然最后也没撑住，服务器还是挂了。后来供电正常了，服务器正常了，却发现有关文件系统没找到，原来那个阵列没起来。
于是先运行mount，提示设备不存在。
于是lsvg查看，找出对应得vg
lsvg xxvg提示需要varyon
于是运行varyonvg，提示The volume group cannot be varied on because
there are no good copies of the descriptor area
查找资料得时候看到有人提示exportvg，然后importvg就好了
于是不知死活的就运行了exportvg
结果运行importvg的时候提示
0516-082 lqueryvg: Unable to access a special device file.
Execute redefinevg and synclvodm to build correct environment.
0516-082 lqueryvg: Unable to access a special device file.
Execute redefinevg and synclvodm to build correct environment.
0516-1140 importvg: Unable to read the volume group descriptor area
on specified physical volume.
试着运行importvg -y vgname hdiskxx
提示0516-024 lqueryvg: Unable to open physical volume.
Either PV was not configured or could not be opened. Run
diagnostics.
0516-024 lqueryvg: Unable to open physical volume.
Either PV was not configured or could not be opened. Run
diagnostics.
0516-1140 importvg: Unable to read the volume group descriptor area
on specified physical volume.
傻眼了，再尝试 varyonvg backupvg
0516-008 varyonvg: LVM system call returned an unknown
error code (3).
根据前面的提示运行redefinevg -d hdisk2 backupvg
0516-024 : Unable to open physical volume.
Either PV was not configured or could not be opened. Run
diagnostics.
运行synclvodm -P -v backupvg
0516-306 : Unable to find volume group backupvg in the Device
Configuration Database.
0516-502 synclvodm: Unable to access volume group backupvg.
# lqueryvg -Atp hdisk2
0516-320 lqueryvg: Physical volume hdisk2 is not assigned to
a volume group.
0516-024 lqueryvg: Unable to open physical volume.
Either PV was not configured or could not be opened. Run
diagnostics.
还是失败。
lsvg发现vg没了
lspv发现pv也没了
这才发现事态的严重性，赶紧查资料找人求助，发现exportvg实际是删除vg，傻了
不敢再做啥了，赶紧找人帮忙，发现有资料说可以恢复
于是赶紧查找硬件信息
odmget -q name=hdisk2 CuAt
高手说只能重建vg。
后来查看lspv发现pv没了，就lsdev -Cc disk
发现
hdiskxx Defined 11-08-L SSA Logical Disk Drive
运行cfgmgr
然后lsdev -Cc disk发现硬件正常了。
于是运行importvg backupvg
0516-082 lqueryvg: Unable to access a special device file.
Execute redefinevg and synclvodm to build correct environment.
0516-082 lqueryvg: Unable to access a special device file.
Execute redefinevg and synclvodm to build correct environment.
0516-1140 importvg: Unable to read the volume group descriptor area
on specified physical volume.
于是再运行importvg -y bakcupvg hdisk2
经过忐忑的等待，搞定！
然后mount
哇卡卡，运气真好，资料都在
。。。。。。。。。。。。。。。。。。。。。。。。。。。。。
经验教训
1.不熟悉的命令不能乱用
2.exportvg之后pv也被删了，不知道为啥
3.遇事不要慌，吉人自有天相
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