I have a friend who has a system that was configured with Centos 7. He can't tell me exactly what he did, but he didn't have enough space to install a piece of software and he was looking at the size of the partitions and somehow he thinks he might have renamed the LVM volume, although he doesn't even know what an LVM volume is.
The machine won't boot anymore, it just hangs and has to be shutdown and restarted. One other big problem is that it appears it was setup with the /boot partition on the LVM volume, and it can't mount the LVM volume.
Booting from installation media using the "Troubleshooting" selection can't find the existing Linux installation and just crashes out. The only way I can boot is to skip the check for the existing install and just get a command prompt. After doing that when I run pvscan, or lvscan, it says it can't find any LVM volumes. I can run sfdisk and look at the linux drive and I see three partitions, one is the EFI, one is a data partition which looks to be formatted in a Windows format, and the LVM volume. I don't see any issues with the partition table.
If I can get it up and running again, I'll move the /boot partition to a dedicated partition (non LVM), but for now, how can I get the LVM volume mounted?