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Previous versions of lvm will not obey the restrictions imposed by the new system_id, and would allow such a VG to be written. So, a VG with a new system_id is further changed to force previous lvm versions to treat it as read-only. This is done by removing the WRITE flag from the metadata status line of these VGs, and putting a new WRITE_LOCKED flag in the flags line of the metadata. Versions of lvm that recognize WRITE_LOCKED, also obey the new system_id. For these lvm versions, WRITE_LOCKED is identical to WRITE, and the rules associated with matching system_id's are imposed. A new VG lock_type field is also added that causes the same WRITE/WRITE_LOCKED transformation when set. A previous version of lvm will also see a VG with lock_type as read-only. Versions of lvm that recognize WRITE_LOCKED, must also obey the lock_type setting. Until the lock_type feature is added, lvm will fail to read any VG with lock_type set and report an error about an unsupported lock_type. Once the lock_type feature is added, lvm will allow VGs with lock_type to be used according to the rules imposed by the lock_type. When both system_id and lock_type settings are removed, a VG is written with the old WRITE status flag, and without the new WRITE_LOCKED flag. This allows old versions of lvm to use the VG as before.
This tree contains the LVM2 and device-mapper tools and libraries. For more information about LVM2 read the changelog in the WHATS_NEW file. Installation instructions are in INSTALL. There is no warranty - see COPYING and COPYING.LIB. Tarballs are available from: ftp://sources.redhat.com/pub/lvm2/ The source code is stored in git: http://git.fedorahosted.org/git/lvm2.git git clone git://git.fedorahosted.org/git/lvm2.git Mailing list for general discussion related to LVM2: linux-lvm@redhat.com Subscribe from https://www.redhat.com/mailman/listinfo/linux-lvm Mailing lists for LVM2 development, patches and commits: lvm-devel@redhat.com Subscribe from https://www.redhat.com/mailman/listinfo/linux-lvm lvm2-commits@lists.fedorahosted.org (Read-only archive of commits) Subscribe from https://fedorahosted.org/mailman/listinfo/lvm2-commits Mailing list for device-mapper development, including kernel patches and multipath-tools: dm-devel@redhat.com Subscribe from https://www.redhat.com/mailman/listinfo/dm-devel The source code repository used until 7th June 2012 is accessible here: http://sources.redhat.com/cgi-bin/cvsweb.cgi/LVM2/?cvsroot=lvm2.