SAN boot for HP AlphaServer hosts is supported by the system.
SAN boot is supported on HP AlphaServer hosts by using TruCluster Server or OpenVMS Cluster software as the multipathing software on the boot device.
https://datacentersupport.lenovo.com/us/en/products/storage/lenovo-storage/v3700v2/6535
https://datacentersupport.lenovo.com/us/en/products/storage/lenovo-storage/v5030/6536