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LVM
lvm is a utility to create logical volumes.
Create VG for proxmox
We will use /dev/sdb as our drive.
Setup the disk for the physical volume with sgdisk -N 1 /dev/sdb.
Then create the physical volume pvcreate /dev/sdb.
The previous step can come to a halt when the device already contains an old
partition table and will display the error Device /dev/sdb excluded by a filter.
This can be solved by removing the old partition table with wipefs -a /dev/sdb.
And finally create the volume group vgcreate vmdata /dev/sdb.
Then follow the guide in proxmox on how to connect a vg to proxmox.
Add Drive to existing volume group
First format the disk so that it has one partition (we will assume its called
/dev/sdc1).
To add the partition to a group run:
pvcreate /dev/sdc1
vgextend <name of your volume group> /dev/sdc1
Resize a physical volume
To increase the size of a physical volume you have to have free free space in the partition containing the physical volume. A guide to change 'normal' partitions can be found in the disk management article; if you have a volume that is encrypted with LUKS a guide is available in the dm-crypt articel.
To resize the physical volume to the size of the containing volume run:
pvresize /dev/mapper/<name of physical volume>
Increase size of a logical volume
To increase the size of the logical volume you have to have free space in the
according volume group. You can check that by running: vgdisplay.
If you don't have enough space you have to resize the physical volume as
described in this article.
Then run:
lvextend -L +<size (e.g. 40G)> /dev/<volume groupt>/<logical volume>
If you want to allocate all the free space existing in a volume group run:
lvextend -l +100%FREE /dev/<volume group>/<logical volume>
Now you need to extend the filesystem with:
resize2fs /dev/<volume group>/<logical volume>