CentOS mount lvm partition VG rename problem
Volume Group (VG) is a combination of one or more physical volumes. Volume groups combine multiple physical volumes together to form a manageable unit similar to a physical hard disk in a non-LVM system.
Specific reasons
The operating system of one of the centos servers in the company's business cannot be started, and the data needs to be restored and the hard disk is mounted on a server that can be started normally. However, the problem of VG duplicate name occurs and the situation cannot be mounted.
Solution
As shown below:
1. Use pvs/lvs/vgs to view the specific LVM situation
[root@localhost ~]# pvs
PV VG Fmt Attr PSize PFree
/dev/sda3 centos lvm2 a-- 556.66g 4.00m
/dev/sdc1 centos lvm2 a-- 279.39g 0
/dev/sdd2 centos lvm2 a-- 278.39g 4.00m
[root@localhost ~]# lvs
LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert
home centos -wi-a----- 491.09g
home centos -wi------- 495.97g
root centos -wi-ao---- 50.00g
root centos -wi------- 50.00g
swap centos -wi-ao---- 15.56g
swap centos -wi------- 11.81g
[root@localhost ~]# vgs -v
Cache: Duplicate VG name centos: Prefer existing gEVmfo-SGj8-B3Ij-9O3U-jd3a-TftX-OMVfY6 vs new WTOf0a-fVj9-lNK2-AJOU-Q4nA-xuVk-H9AYi4
Cache: Duplicate VG name centos: Prefer existing gEVmfo-SGj8-B3Ij-9O3U-jd3a-TftX-OMVfY6 vs new WTOf0a-fVj9-lNK2-AJOU-Q4nA-xuVk-H9AYi4
Cache: Duplicate VG name centos: Prefer existing WTOf0a-fVj9-lNK2-AJOU-Q4nA-xuVk-H9AYi4 vs new gEVmfo-SGj8-B3Ij-9O3U-jd3a-TftX-OMVfY6
Archiving volume group "centos" metadata (seqno 4).
Archiving volume group "centos" metadata (seqno 4).
Creating volume group backup "/etc/lvm/backup/centos" (seqno 4).
VG Attr Ext #PV #LV #SN VSize VFree VG UUID VProfile
centos wz--n- 4.00m 1 3 0 556.66g 4.00m WTOf0a-fVj9-lNK2-AJOU-Q4nA-xuVk-H9AYi4
centos wz--n- 4.00m 2 3 0 <557.79g 4.00m gEVmfo-SGj8-B3Ij-9O3U-jd3a-TftX-OMVfY6 The above finds that the VG names of the LVM of the existing system and the mounted hard disk (failed system) are duplicated, and there are multiple LVs of root and home.
2. Rename through vg's uuid
If the name of VG is changed, an error will be reported and the name needs to be changed through UUID, where uuid is viewed through the above vgs -v
[root@localhost ~]# vgrename gEVmfo-SGj8-B3Ij-9O3U-jd3a-TftX-OMVfY6 centos01 Processing VG centos because of matching UUID gEVmfo-SGj8-B3Ij-9O3U-jd3a-TftX-OMVfY6 Volume group "gEVmfo-SGj8-B3Ij-9O3U-jd3a-TftX-OMVfY6" successfully renamed to "centos01"
3. Check the lv status
I found that there are several inactive
[root@localhost ~]# vgs VG #PV #LV #SN Attr VSize VFree centos 1 3 0 wz--n- 556.66g 4.00m centos01 2 3 0 wz--n- <557.79g 4.00m [root@localhost ~]# lvscan ACTIVE '/dev/centos/swap' [15.56 GiB] inherit ACTIVE '/dev/centos/home' [491.09 GiB] inherit ACTIVE '/dev/centos/root' [50.00 GiB] inherit inactive '/dev/centos01/swap' [11.81 GiB] inherit inactive '/dev/centos01/home' [495.97 GiB] inherit inactive '/dev/centos01/root' [50.00 GiB] inherit
4. Modify the properties of vg
[root@localhost ~]# vgchange -ay /dev/centos01 3 logical volume(s) in volume group "centos01" now active [root@localhost ~]# lvscan ACTIVE '/dev/centos/swap' [15.56 GiB] inherit ACTIVE '/dev/centos/home' [491.09 GiB] inherit ACTIVE '/dev/centos/root' [50.00 GiB] inherit ACTIVE '/dev/centos01/swap' [11.81 GiB] inherit ACTIVE '/dev/centos01/home' [495.97 GiB] inherit ACTIVE '/dev/centos01/root' [50.00 GiB] inherit
5. Mount the directory
[root@localhost ~]# cd / [root@localhost /]# mkdir centos01-root [root@localhost /]# mkdir centos01-home [root@localhost /]# mount /dev/centos01/root /centos01-root/ [root@localhost /]# mount /dev/centos01/home /centos01-home/ [root@localhost /]# cd centos01-root [root@localhost centos01-root]# ls bin boot dev etc home lib lib64 media mnt opt proc root run sbin sk srv sys tmp usr var
Through the above operations, the files can be recovered.
Summarize
These are just personal experience. I hope you can give me a reference and I hope you can support me more.