The FHS does not cover the general situation adequately IMHO, so you have to choose your own compromise.
If your root is read-only, then change your lvm.conf to place the default backup location somewhere else that is writeable. What you *should* do is backup those backups to a location independent of this LVM instance each time you change them. E.g. change the backup location to some /var subdir and have your 'create snapshot' script rsync that dir over to another system after creating the snapshot. Alasdair -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org