repair a damaged vg

[Tom H]

> after:
>  pvcreate /dev/sdc
>  Physical volume "/dev/sdc" successfully created

> sadly i issued:
>  vgextend /dev/mapper/VolGroup01 /dev/sdc
>  Volume group "VolGroup01" successfully extended

> instead of doing:

>  vgextend VolGroup01 /dev/sdc
>  Volume group "VolGroup01" successfully extended

> then i tryied to extend lv

> lvextend -l 100%VG  /dev/mapper/VolGroup01-lvol0
>  Couldn't find device with uuid 'qf0ApW-42u1-nlyq-2TTn-MIgB-3dT1-BNe3GF'.
>  Extending logical volume lvol0 to 329,99 GB
>  Cannot update volume group VolGroup01 while physical volumes are missing.

Have you tried vgreduce and then vgextend again before the lvextend?