[CentOS] Convert from LVM

Fri Jun 8 18:00:44 UTC 2018
Robert Heller <heller at deepsoft.com>

Do you mean you have a CentOS 7 VM which has partitioned is virtual disk (eg 
/dev/vda) to have a LVM partition, which in turn has a logical volume for 

It should be possible create a fresh virtual disk, add it to the VM as 
/dev/vdb (say), and then inside the CentOS 7 VM, partition the new disk into 
however many partitions you need (say /dev/vdb1 for /boot, /dev/vdb2 for swap, 
and /dev/vdb3 for /) and then use dd or use mkfs and rsync, etc. to copy the 
file systems, go a grub-install on /dev/vdb and then stop the VM and remove 
the /dev/vda disk from it and restart it.  Oh, you might need to make sure 
the UUID or LABEL used to reference the root file system in the grub config 
file is updated to reflect the new root (might not be needed if you used dd).

Unlike MS-Windows, Linux is (generally) perfectly happy to disk "transplants", 
so long as you are careful about re-installing grub and making sure the grub 
config has the right "magic".

At Fri, 8 Jun 2018 12:11:40 -0500 CentOS mailing list <centos at centos.org> wrote:

> I have a Centos 7 install using EXT4 on LVM.  Its running as a VM
> inside KVM.  Issue I have run into is that fstrim does not work due to
> the LVM.  Without fstrim snapshots have gotten huge.  Is there a way
> convert it from LVM to non-LVM without a complete reinstall?
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