external journals, UUIDs and LVM

Matt Bernstein mb/ext3 at dcs.qmul.ac.uk
Mon Sep 17 08:05:58 UTC 2007


I'm starting to use LVM2 on my big servers. I'm using ext3 with 
data=journal and the journals on different volume groups to the volumes.

"tune2fs -l" on the volumes show _both_ the UUID and device major/minor of 
the journal, irrespective of which you specify during "tunefs -j".

With LVM the latter are dymanically allocated (0xfdnn), so may change from 
boot to boot.

My question is: will mount find the journal by UUID? You can see it might 
be fun if it doesn't ;)



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