Add an iSCSI LUN to proxmox

[Yariv]

Hi,
Just a nubbie trying to add a iSCSI LUN to prox mox.
After adding in GUI Datacenter>Storage>Add LUN is visible in lsblk in the operating system.
When I try to add a disk for a VM>Disks>Storage I see the iSCSi storage with available 0.
Saw in documentation I may need to add an LVM in Datacenter>Storage>LVM I'm asked for a Volume group, is the VG something I need to create manually on the operating system level?
How do I set a size for it?

Basically how do I go form adding an iSCSI to be able to add VMs on it?
Thanks,
Yariv

 

[Yariv]

I'm coming fro Ovirt so used to it taking over the iSCSI LUN and doing all configuration automatically.