[linux-lvm] LVM UUIDs are not UUIDs!?

Dan Stromberg strombrg at dcs.nac.uci.edu
Thu Sep 23 17:10:15 UTC 2004

Same in concept, different implementation, easier to use?

The Lustre does the same thing: It has what it calls UUID's, that are
actually more descriptive strings than what the standard calls for.

On Thu, 2004-09-23 at 01:47, Ralf S. Engelschall wrote:
> While setting up an LVM2 based 3TB storage the last days I've stumbled
> over LVM2's "UUID" strings as displayed by its pvdisplay, vgdisplay, and
> lvdisplay commands. It is clear that LVM2 requires those ids, but *WHY*
> are they called "UUID"?
> They do NOT conform in any way to the standardized ISO/IEC 11578:1996
> compliant Universally Unique Identifier (UUID) strings. Neither by the
> way they are created (LVM2 UUIDs are just random numbers while ISO v4
> random UUIDs are fixed bit-fields plus random remaining bits) nor the
> way they are formatted. Examples:
> LVM2               UUID: H9C8iE-braW-70bk-Fx9x-lMIX-Rmmy-5XgkM9
> ISO/IEC 11578:1996 UUID: 4a8287f4-0d33-11d9-8068-0002b31abd79
> So, wouldn't it be reasonable that either LVM2 uses a real open-source
> UUID library for dealing with standardized UUIDs (ext2fs's libuuid, OSSP
> uuid, etc) or at least names its ids own id strings just "ID" or even
> "LVMID"?
> Perhaps at least in the visible output strings in order to reduce
> confusion with standardized UUIDs...
>                                        Ralf S. Engelschall
>                                        rse at engelschall.com
>                                        www.engelschall.com
> _______________________________________________
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> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
Dan Stromberg DCS/NACS/UCI <strombrg at dcs.nac.uci.edu>

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