Proxmox + VM iSCSI vs local storage

Hello !

I'm currently working on a new server with those specs :

Intel Xeon 8 core
2x250gb SSD raid1 (used to store the VM's and proxmox)
3x4TB as RAID5 (11 TB free space)
16gb memory

Proxmox runs fine :) my only wish is to set up a storage server. I want to use OpenMediaVault as a VM but I have few doubt on how to make it properly with maximum flexibility.

What's the best option to connect my 11TB storage for the OMV VM ? If it's possible I want to use LVM on it with for more flexibility if I want to make some change without altering all of the system.

- I don't think that mounting a virtual hard drive with 11TB in OMV is the best idea because if I want to split my 11TB storage in something like 9TB (storage) + 2 TB (other stuff) I will need to shrink the virtio HDD
- I thought about mounting a iscsi target with 1 LV of 11TB (and reduce it + adding another one LV if I need it in the future for other stuff).

Maybe i'm wrong or I don't understand some elementary things...

Thanks for readings.