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What happens when we try to use a disk that has the same LVM names as our system?
[root@st ~]# pvs WARNING: Not using lvmetad because duplicate PVs were found. WARNING: Use multipath or vgimportclone to resolve duplicate PVs? WARNING: After duplicates are resolved, run "pvscan --cache" to enable lvmetad. WARNING: PV aP2MDZ-3scA-JYFj-cX1A-22JX-tj1p-iaNIZl on /dev/sdb3 was already found on /dev/sda3. WARNING: PV aP2MDZ-3scA-JYFj-cX1A-22JX-tj1p-iaNIZl prefers device /dev/sda3 because device is used by LV. PV VG Fmt Attr PSize PFree /dev/sda3 centos lvm2 a-- 99.00g 4.00m [root@st ~]# lvs WARNING: Not using lvmetad because duplicate PVs were found. WARNING: Use multipath or vgimportclone to resolve duplicate PVs? WARNING: After duplicates are resolved, run "pvscan --cache" to enable lvmetad. WARNING: PV aP2MDZ-3scA-JYFj-cX1A-22JX-tj1p-iaNIZl on /dev/sdb3 was already found on /dev/sda3. WARNING: PV aP2MDZ-3scA-JYFj-cX1A-22JX-tj1p-iaNIZl prefers device /dev/sda3 because device is used by LV. LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert home centos -wi-ao---- 6.99g opt centos -wi-ao---- 20.00g root centos -wi-ao---- 32.00g swap centos -wi-ao---- 4.00g tmp centos -wi-ao---- 4.00g var centos -wi-ao---- 32.00g [root@st ~]# vgdisplay WARNING: Not using lvmetad because duplicate PVs were found. WARNING: Use multipath or vgimportclone to resolve duplicate PVs? WARNING: After duplicates are resolved, run "pvscan --cache" to enable lvmetad. WARNING: PV aP2MDZ-3scA-JYFj-cX1A-22JX-tj1p-iaNIZl on /dev/sdb3 was already found on /dev/sda3. WARNING: PV aP2MDZ-3scA-JYFj-cX1A-22JX-tj1p-iaNIZl prefers device /dev/sda3 because device is used by LV. --- Volume group --- VG Name centos System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 8 VG Access read/write VG Status resizable MAX LV 0 Cur LV 6 Open LV 6 Max PV 0 Cur PV 1 Act PV 1 VG Size 99.00 GiB PE Size 4.00 MiB Total PE 25343 Alloc PE / Size 25342 / 98.99 GiB Free PE / Size 1 / 4.00 MiB VG UUID u5BLZG-ds9z-6dRh-0AI7-kAxD-n6lh-cvkKEw [root@st ~]# vgrename aP2MDZ-3scA-JYFj-cX1A-22JX-tj1p-iaNIZl recover WARNING: Not using lvmetad because duplicate PVs were found. WARNING: Use multipath or vgimportclone to resolve duplicate PVs? WARNING: After duplicates are resolved, run "pvscan --cache" to enable lvmetad. WARNING: PV aP2MDZ-3scA-JYFj-cX1A-22JX-tj1p-iaNIZl on /dev/sdb3 was already found on /dev/sda3. WARNING: PV aP2MDZ-3scA-JYFj-cX1A-22JX-tj1p-iaNIZl prefers device /dev/sda3 because device is used by LV. WARNING: PV aP2MDZ-3scA-JYFj-cX1A-22JX-tj1p-iaNIZl on /dev/sdb3 was already found on /dev/sda3. WARNING: PV aP2MDZ-3scA-JYFj-cX1A-22JX-tj1p-iaNIZl prefers device /dev/sda3 because of previous preference. Volume group "aP2MDZ-3scA-JYFj-cX1A-22JX-tj1p-iaNIZl" not found Cannot process volume group aP2MDZ-3scA-JYFj-cX1A-22JX-tj1p-iaNIZl
We can use vgimportclone to rename the extra volume names and then use. However if we do this the volume group will be permanently renamed. To mount on a target system with the original name, we need to boot from CDROM and rename the volume back.
[root@pe-test-st ~]# vgimportclone --basevgname recover /dev/sdb3 WARNING: PV aP2MDZ-3scA-JYFj-cX1A-22JX-tj1p-iaNIZl on /dev/sdb3 was already found on /dev/sda3. WARNING: PV aP2MDZ-3scA-JYFj-cX1A-22JX-tj1p-iaNIZl prefers device /dev/sda3 because device is used by LV. [root@pe-test-st ~]# lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert home centos -wi-ao---- 6.99g opt centos -wi-ao---- 20.00g root centos -wi-ao---- 32.00g swap centos -wi-ao---- 4.00g tmp centos -wi-ao---- 4.00g var centos -wi-ao---- 32.00g home recover -wi------- 6.99g opt recover -wi------- 20.00g root recover -wi------- 32.00g swap recover -wi------- 4.00g tmp recover -wi------- 4.00g var recover -wi------- 32.00g [root@pe-test-st ~]# vgchange -a y recover 6 logical volume(s) in volume group "recover" now active [root@pe-test-st ~]# ls /dev/recover/ home opt root swap tmp var [root@pe-test-st ~]# mount -o ro,norecovery,nouuid /dev/recover/root /mnt [root@pe-test-st ~]# ls /mnt 1 boot dev home lib64 media nsr proc run srv tmp var bin cdrom etc lib lost+found mnt opt root sbin sys usr