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Windows Server Hyper-V hosts support local boot and boot from SAN. Boot from SAN requires the use of a supported iSCSI or FC HBA that supports boot from SAN. Boot from SAN disks should be assigned LUN ID 0.
A boot from SAN disk supports MPIO. After staging a Windows Server to an MPIO-capable boot from SAN disk, install and configure the MPIO feature.
Boot from SAN allows similar hosts to be provisioned quickly by using a system-prepared (sysprep) gold image. Replicated snapshots of boot from SAN Hyper-V hosts allow for fast host recovery at an alternate location when both sites use similar host hardware.