UUID

Can someone explain the UUID, etc on a volume and on VGs?

Is the UUID stored on the volume, or on the host machine?

The reason I ask, is that I have a parrallel scsi raid, which is connected to 2 machines. If i reboot both machines, or go through a vgexport/import procedure (while online), i can see the VGs and LVs on both machines.. can even mount the volumes simultaneously (It was only a test.. I understand that it is not a Shared Filesystem, and would never do simultaneous mounts on production filesystems).

This is what I believe to be the case:

1. The UUID is stored on the volume itself, and the VG data is stored somewhere on the disks also.
2. The import/export/activated/deactivated status of a volume is held on the host machine.

this allows 2 machines to see the same VG/LVs.

Is this correct? And is it supported as a function of LVM, or am I in 'unsupported' territory?

Matt Schillinger
[email protected]