For the database host, the asm disk group was added after the vg used for data backup was deleted. It was found that the disk serial numbers of the two nodes were inconsistent. The vg was mounted on only one node before it was deleted. Check the PV information of the node with the larger sequence number, which is displayed as follows:
# pvs Error reading device /dev/bakupvg/bakupvg-baklv01 at 0 length 512. Error reading device /dev/bakupvg/bakupvg-baklv01 at 0 length 4. Error reading device /dev/bakupvg/bakupvg-baklv01 at 4096 length 4. PV VG Fmt Attr PSize PFree /dev/vda2 centos lvm2 a-- <197.88g 0 /dev/vda3 centos lvm2 a-- 11.11g 16.00m
The main reason for this problem is that after the disk is deleted, the corresponding drive letter is not automatically cleaned up. You can see it through the following command
# dmsetup ls | grep datavg bakupvg-baklv01 (253: 2)
Solution:
1. Restart directly
2. dmsetup remove bakupvg-baklv01
1 or 2 choose any one, and then perform the scan operation.
reference:
https://access.redhat.com/solutions/140273