If you're running XPE in a virtual environment, the easiest thing to do is to use the hypervisor to mount the remote iSCSI storage and present a virtual disk to the guest. On bare metal, a NIC with the right iSCSI offload functionality that will present as an HBA to the OS would work as well in theory, provided the driver is supported by XPE.
XPEnology as iscsi iniciator ?
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If you're running XPE in a virtual environment, the easiest thing to do is to use the hypervisor to mount the remote iSCSI storage and present a virtual disk to the guest. On bare metal, a NIC with the right iSCSI offload functionality that will present as an HBA to the OS would work as well in theory, provided the driver is supported by XPE.