UCS C-series 220 M3 and 240 M3 rack servers have embedded Intel i350 LOMs and support PCI-E based Intel i350 NICs that are capable of iSCSI boot functionality. However, the problem is option ROM on Intel NICs are shipped with PXE as the default boot protocol and hence user does not have an hot key option to enter iSCSI boot configuration.Also, Intel does not allow to switch boot protocol in the option rom ( CSCtx85320 ) .
We need to use Intel tool BOOTUTIL to make changes to option ROM which allows to add iSCSI boot configuration parameters in the adapter.
The CIMC CLI is a command-line management interface for Cisco UCS C-Series servers. You can launch the CIMC CLI and manage the server by the serial port or over the network by SSH or Telnet. By default, Telnet access is disabled.
Changing to iSCSI
Instructions on how to configure the adapter and change boot protocol from PXE to iSCSI