Hi if I have a disk that are merged into a server coming from another server containing a lvm snapshot How can I convert this foreign disk to an existing lv volume?
The documentation says I can use lvconvert-Zn -s targetvg/targetlv sourcevg/sourcelv But I guess I have to perform some lvm metadata recreation first? please let me know what steps are neede Regards Tomas Sent from my iPhone > On 17 Sep 2020, at 17:22, Heinz Mauelshagen <hei...@redhat.com> wrote: > > Tomas, > > the first PE starts at offset 2048 sectors of size 512 bytes by default, i.e. > the LVM MDA (metadata area) > is ~1MiB big (because the MDA starts at offset 1 page into the device). If > you plan for large numbers of LVs or expect very scattered allocations which > both grow the metadata, you may want to create a > bigger MDA using vgcreate's option --metadatasize (also see /etc/lvm/lvm.conf > description on > metadata/pvmetadatasize). > > On 9/16/20 5:50 PM, Tomas Dalebjörk wrote: > > hi > > > > I am trying to understand how big the lvm metadata is > > > > in the vgcfgbackup file, I can see extent_size = 8192 dev_size = > > 204800 pe_start = 2048 pe_count 24 > > > > pe_count(24) * extent_size(8192) = 196608 bytes usable space of the > > total dev_size(204800) metadata size? = dev_size(204800) - 196608 = > > 8192 > > > > but... pe_start is 2048? so what is pe_start here? cant be > > sectors(512)? bytes? well than ther be not aligned > > > > so where starts the actual data? and where ends the lvm metadata? > At offset 2048 sectors (1MiB into the device) / MDA ends at sector 2047. > > Mind that lvm2 metadata is text formatted (see /etc/lvm/backup/$VGName for > one) > and thus varies in size (the MDA is used as a ring buffer for 2 copies of the > MDA to > support atomic updates). As pointed out above when refering to 'vgcreate > --metadatasize', > in more elaborate setups you may run out of MDA space. > > Heinz > > > > > regards Tomas Sent from my iPhone > > > > > > _______________________________________________ linux-lvm mailing > > list linux-lvm@redhat.com > > https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO > > at http://tldp.org/HOWTO/LVM-HOWTO/ >
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