解决linux挂载其他硬盘lvm分区时VG重复问题

问题：

[root@w ~]# vgscan
Reading all physical volumes.  This may take a while...
WARNING: Duplicate VG name vg_w: Existing nMjHCd-6EUR-66l4-y27E-n5is-i1Q4-ddqest (created here) takes precedence over Bju7iV-coBV-RZLb-SZX6-ol3Z-fO1A-bvSTw6
WARNING: Duplicate VG name vg_w: Existing nMjHCd-6EUR-66l4-y27E-n5is-i1Q4-ddqest (created here) takes precedence over Bju7iV-coBV-RZLb-SZX6-ol3Z-fO1A-bvSTw6
Found volume group "vg_w" using metadata type lvm2
Found volume group "vg_w" using metadata type lvm2

解决过程：

通过vgdisplay查看lvm的VG UUID

[root@w ~]# vgdisplay vg_w
WARNING: Duplicate VG name vg_w: Existing nMjHCd-6EUR-66l4-y27E-n5is-i1Q4-ddqest (created here) takes precedence over Bju7iV-coBV-RZLb-SZX6-ol3Z-fO1A-bvSTw6
--- Volume group ---
VG Name               vg_w
System ID
Format                lvm2
Metadata Areas        1
Metadata Sequence No  3
VG Access             read/write
VG Status             resizable
MAX LV                0
Cur LV                2
Open LV               2
Max PV                0
Cur PV                1
Act PV                1
VG Size               7.51 GiB
PE Size               4.00 MiB
Total PE              1922
Alloc PE / Size       1922 / 7.51 GiB
Free  PE / Size       0 / 0
VG UUID               nMjHCd-6EUR-66l4-y27E-n5is-i1Q4-ddqest

说明当前操作系统使用的vg_w的 VG UUID 是 nMjHCd-6EUR-66l4-y27E-n5is-i1Q4-ddqest，而VG UUID为Bju7iV-coBV-RZLb-SZX6-ol3Z-fO1A-bvSTw6是另一块硬盘的LVM分区。

将第二块硬盘的VG名字重命名

[root@w ~]# vgrename Bju7iV-coBV-RZLb-SZX6-ol3Z-fO1A-bvSTw6 vg_w1
WARNING: Duplicate VG name vg_w: Existing nMjHCd-6EUR-66l4-y27E-n5is-i1Q4-ddqest (created here) takes precedence over Bju7iV-coBV-RZLb-SZX6-ol3Z-fO1A-bvSTw6
WARNING: Duplicate VG name vg_w: Existing nMjHCd-6EUR-66l4-y27E-n5is-i1Q4-ddqest (created here) takes precedence over Bju7iV-coBV-RZLb-SZX6-ol3Z-fO1A-bvSTw6
WARNING: Duplicate VG name vg_w: nMjHCd-6EUR-66l4-y27E-n5is-i1Q4-ddqest (created here) takes precedence over Bju7iV-coBV-RZLb-SZX6-ol3Z-fO1A-bvSTw6
Volume group "vg_w" successfully renamed to "vg_w1"

通过vgdisplay查看VG信息

[root@w ~]# vgdisplay
--- Volume group ---
VG Name               vg_w1
System ID
Format                lvm2
Metadata Areas        1
Metadata Sequence No  6
VG Access             read/write
VG Status             resizable
MAX LV                0
Cur LV                2
Open LV               0
Max PV                0
Cur PV                1
Act PV                1
VG Size               7.51 GiB
PE Size               4.00 MiB
Total PE              1922
Alloc PE / Size       1922 / 7.51 GiB
Free  PE / Size       0 / 0
VG UUID               Bju7iV-coBV-RZLb-SZX6-ol3Z-fO1A-bvSTw6

--- Volume group ---
VG Name               vg_w
System ID
Format                lvm2
Metadata Areas        1
Metadata Sequence No  3
VG Access             read/write
VG Status             resizable
MAX LV                0
Cur LV                2
Open LV               2
Max PV                0
Cur PV                1
Act PV                1
VG Size               7.51 GiB
PE Size               4.00 MiB
Total PE              1922
Alloc PE / Size       1922 / 7.51 GiB
Free  PE / Size       0 / 0
VG UUID               nMjHCd-6EUR-66l4-y27E-n5is-i1Q4-ddqest

激活VG

[root@w ~]# lvscan
inactive          '/dev/vg_w1/lv_root' [6.71 GiB] inherit
inactive          '/dev/vg_w1/lv_swap' [816.00 MiB] inherit
ACTIVE            '/dev/vg_w/lv_root' [6.71 GiB] inherit
ACTIVE            '/dev/vg_w/lv_swap' [816.00 MiB] inherit
[root@w ~]# vgchange -ay /dev/vg_w1
2 logical volume(s) in volume group "vg_w1" now active
[root@w ~]# lvscan
ACTIVE            '/dev/vg_w1/lv_root' [6.71 GiB] inherit
ACTIVE            '/dev/vg_w1/lv_swap' [816.00 MiB] inherit
ACTIVE            '/dev/vg_w/lv_root' [6.71 GiB] inherit
ACTIVE            '/dev/vg_w/lv_swap' [816.00 MiB] inherit

挂载lvm文件系统

[root@w ~]# mount /dev/vg_w1/lv_root  /mnt

相关命令
- vgscan：扫描所有VG
- vgdisplay:显示VG信息
- lvscan:扫描LVM逻辑卷
- vgchange -ay /dev/vg_w1:激活VG
- vgchange -an /dev/vg_w1:取消激活VG
- vgrename：修改VG名称