1. Restoring the VG UUIDs using uuid

1. Restoring the VG UUIDs using uuid_fixer
Prev	Appendix A. Dangerous Operations	Next

1. Restoring the VG UUIDs using uuid_fixer

If you've upgraded LVM from previous versions to early 0.9 and 0.9.1 versions of LVM and vgscan says vgscan -- no volume groups found, this is one way to fix it.

Download the UUID fixer program from the contributor directory at Sistina.
It is located at ftp://ftp.sistina.com/pub/LVM/contrib/uuid_fixer-0.3-IOP10.tar.gz"

Extract uuid_fixer-0.3-IOP10.tar.gz

# tar zxf uuid_fixer-0.3-IOP10.tar.gz

cd to uuid_fixer
```
# cd uuid_fixer
            
```
You have one of two options at this point:
1. Use the prebuild binary (it is build for i386 architecture).
  Make sure you list all the PVs in the VG you are restoring, and follow the prompts
```
# ./uuid_fixer <LIST OF ALL PVS IN VG TO BE RESTORED>
                
```
2. Build the uuid_builder program from source
  Edit the Makefile with your favorite editor, and make sure LVMDIR points to your LVM source.
  Then run make.
```
# make
                
```
  Now run uuid_fixer. Make sure you list all the PVs in the VG you are restoring, and follow the prompts.
```
# ./uuid_fixer <LIST OF ALL PVS IN VG TO BE RESTORED>
                
```
Deactivate any active Volume Groups (optional)
```
# vgchange -an
            
```
Run vgscan
```
# vgscan
            
```
Reactivate Volume Groups
```
# vgchange -ay
            
```