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Normally, if there are partitions defined on top of device-mapper device, there should be a device-mapper device created for each partiton on top of the old one and once the underlying DM device is used by another devices (partition mappings in this case), it can't be used as a PV anymore. However, sometimes, it may happen the partition mappings are missing - either the partitioning tool is not creating them if it does not contain full support for device-mapper devices or the mappings were removed. Better safe than sorry - check for partition header on DM devs and filter them out as unsuitable for PVs in case the check is positive. Whatever the user is doing, let's do our best to prevent unwanted corruption (...by running pvcreate on top of such device that would corrupt the partition header).
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.