[linux-lvm] LVM PV UUID problem

[Zdenek Kabelac]

Dne 09. 10. 20 v 15:12 Digimer napsal(a):
> Hi all,
> 
>    I'm storing LVM information in a postgres database, and wanted to use
> the UUID from the PVs / VGs / LVs as the UUIDs in the database. I
> noticed when I tried to do this that postgres complained that the UUID
> was not valid. I checked with an online UUID validator
> (https://www.freecodeformat.com/validate-uuid-guid.php) and it also
> reported as invalid.
> 
> Example;
> 
> ====
> # pvdisplay | grep UUID
>    PV UUID               jLkli2-dEXx-5Y8n-pYlw-nCcy-9dFL-3B6jU3
> ====
> 
>    Is this a known issue?
> 

Hi

At the time of lvm2 devel I believe UUID was just a unique identifier,
later some effort to standardize it came in.

But really you should NOT be using basically internal unique identifiers
in your DB - this are internal to DM/LVM work and might be changed at any time 
to something else.

User is supposed to use  'vgname' & 'lvname'  - so there you can put those
valid UUID sequences - although human readable strings are always nicer ;)

Zdenek