iSCSI Shared Storage Resize whilst system still live

Morning,


I have successfully resize shared storage before on Proxmox BEFORE my cluster went to host many production servers.


I need to expand my shared storage again and run pvresize, is this safe to do whilst VM's are still running?


If not, could I live migrate all VMs to one host, resize the host with no VMs, move them all over and repeat?


Is this possible or do all VM's need to be switched off?


Thanks,

Luca