A fully redundant storage for your VM´s with just no need of expensive SAN equipment, configured in about 30 to 60 minutes – starting from bare-metal. If you want to achieve a similar setup with traditional virtualization solutions with SAN you will need at least 4 servers boxes and the storage network.
Traditional setup with SAN (eg. iSCSI, NFS, FC):
- Two servers for a redundant SAN
- Two servers for redundant virtualization hosts
- Extra storage network, VLAN´s, FC switches, etc
- Complex setup
Proxmox VE with DRBD:
- Only two servers with raid controllers and a bunch of hard drives (configure two raid volumes, one for Proxmox VE and one for DRBD device)