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Old 03-06-2013, 08:27 AM   #1
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Are vg uuid unique ?

I tried to search for the answer in various posts but to no avail.

1) vg uuid generated on a single node seems to be unique. Please confirm.

2) But in a cluster (that has a shared storage) can the vg UUID be different for a shared vg containing same pvs ?.
Old 03-06-2013, 09:22 AM   #2
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What you mean with 'vg' and 'pvs'? If you mean the disks' UUID is surely unique (UUID means 'universally unique identifier'), but I suggest you to use labels instead UUIDs. They are more friendly and you can use them like UUIDs: for example, for mounting a FAT16 device, that you call "pendrive", in a directory called /media/pendrive, you can run from terminal:
mount -t vfat LABEL=pendrive /media/pendrive
Old 03-07-2013, 04:28 AM   #3
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1) Read the description in the manpage for uuidgen.
2) The uuid is generated once - when the vg is created. It will be common, and is part of the meta-data read at boot/mount time
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