Hello all,
Is it feasible to convert a non-LVM partition into an LVM-managed volume while preserving all existing data and avoiding any interruption to running services?
The filesystem is currently residing on a conventional standard partition that does not support resizing, making it necessary to migrate it over to an LVM-managed volume for greater flexibility.
Thanks, Julia 
Hello,
Before proceeding, ensure that a full backup of all data has been taken and that these steps have been tested on a non-production test system first.
There is no direct or risk-free method to convert a standard partition to LVM in place. The recommended approach is to manually migrate the data by following the steps below:
Create a new Logical Volume (LV) and format it with the appropriate filesystem. Refer to the AlmaLinux / CentOS documentation on creating LVM volumes for guidance. The size of the new LV must be equal to or larger than the existing filesystem.
Create a temporary mount point and mount the newly created LV to it.
Take a complete backup of the existing filesystem using a suitable utility such as cp, rsync, dd, dump, or any other preferred backup tool.
Restore the backed-up data onto the newly created LV.
Update the /etc/fstab file to reflect the new LVM volume and ensure it mounts automatically at the correct mount point on the next reboot.
Cheers, Jenn 