Sadly I cannot extend the filesystem anyway thanks to the installer defaulting to ext3 so I'm using lvm for almost nothing except snapshots (i.e. I shouldn't be needing lvcreate/lvextend).
What I was worried was: my fs is definetely on the HW raid (logically), but I wasn't sure if free blocks would have come from somewhere else.
Anyway this seems to do the trick. Thanks once again.
Wallace
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