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My root is mounted readonly (on purpose). I have a separate, read-write vg where I want to lvconvert --merge a thin snapshot. I'm getting Cannot archive volume group metadata for $VG to read-only filesystem. The manpage was unhelpful. Is there some flag I can pass to disable this "archive" functionality or to control where the archive is written?

Duncan Townsend
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You can't do this w/o create a backup and change the file in /etc/lvm/archive So remount temporary the root filesystem as r/w, exec the operation and remount it as r/o.

Romeo Ninov
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