Repair thin pool

[Mars <kirapangzi@gmail.com>]

Hi there,

We're using Centos 7.0 with lvm 2.02.105 and met a problem as underlying:

After a electricity powerdown in the datacenter room, thin provision volumes came up with wrong states:

[root@storage ~]# lvs -a

  dm_report_object: report function failed for field data_percent

  LV                              VG               Attr       LSize   Pool        Origin           Data%  Move Log Cpy%Sync Convert

  DailyBuild                      vgg145155121036c Vwi-d-tz--   5.00t pool_nas                                     

  dat                             vgg145155121036c Vwi-d-tz--  10.00t pool_nas                                         

  lvol0                           vgg145155121036c -wi-a-----  15.36g                                                              

  [lvol3_pmspare]                 vgg145155121036c ewi-------  15.27g

  market                          vgg145155121036c Vwi-d-tz--   3.00t pool_nas                    

  pool_nas                        vgg145155121036c twi-a-tz--  14.90t                                0.00                          

  [pool_nas_tdata]                vgg145155121036c Twi-ao----  14.90t                                                              

  [pool_nas_tmeta]                vgg145155121036c ewi-ao----  15.27g                                                                                                                       

  share                           vgg145155121036c Vwi-d-tz--  10.00t pool_nas

 the thin pool "pool_nas" and general lv "lvol0" are active, but thin provision volumes cannot be actived even with cmd "lvchange -ay thin_volume_name".

To recover it, we tried following ways refer to these mail conversations: http://www.spinics.net/lists/lvm/msg22629.html and http://comments.gmane.org/gmane.linux.lvm.general/14828.

1, USE: "lvconvert --repair vgg145155121036c/pool_nas"

output as below and thin volumes still cannot be active.

WARNING: If everything works, remove "vgg145155121036c/pool_nas_tmeta0".

WARNING: Use pvmove command to move "vgg145155121036c/pool_nas_tmeta" on the best fitting PV.

2, USE manual repair steps:

2a: inactive thin pool.

2b: create a temp lv "metabak".

2c: swap the thin pool's metadata lv: "lvconvert --thinpool vgg145155121036c/pool_nas --poolmetadata metabak -y", only with "-y" option can submit the command.

2d: active temp lv "metabak" and create another bigger lv "metabak1".

2e: repair metadata: "thin_restore -i /dev/vgg145155121036c/metabak-o /dev/vgg145155121036c/metabak1", and got segment fault.

So, is there any other way to recover this or some steps we do wrong?

Thank you very much.

Mars

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