Centos 7 - Extend volume group to consume remaining space

phoeneous

I'm throwing Centos 7 on an old laptop with a 128GB hard disk. During the install I chose to have it automatically partition (bad idea). After install was complete I noticed that it created /dev/mapper/home as a separate lvm (65GB) from /dev/mapper/root (50GB).
I'd prefer to keep all my stuff under / as opposed to a separate lvm for /home So I umount /home and lvremove it.
When I run vgdisplay I see Free PE / Size 65.00GB.
How can I have my entire /root lvm take up the remainder of the Free PE in the volume group? I've tried lvextend and vgextend but it doesnt appear to work, still shows 65GB free. Any advice appreciated.

alias454

Extend the logical volume
lvextend -l100%FREE /dev/mapper/root

If you used an xfs filesystem (it should be the default)
yum install xfsprogs.x86_64 xfs_growfs /dev/mapper/root

phoeneous

Thanks. Syntax ended up being /dev/name of volume group/name of logical volume. So lvextend -l +100%FREE /dev/centos/root worked perfect.

https://www.centos.org/docs/5/html/Cluster_Logical_Volume_Manager/lv_extend.html

varelg

Prepare your backup and practice restoring from backup because you'll need that after updating CentOS 7. It has a strange propensity to ask for the old disk geometry, and when not found- will not boot.

JockVSJock

You'll still need to finalize the space growth so the OS can see it after running lvextend command:

xfs_growfs /mnt/mount_point_here 

Should see output that pertains to the XFS filesystems.

Also check that the OS see it with

df -ha