https://ciscolivewem.cisco.com/c/en/us/td/docs/unified_computing/ucs/ucs-manager/GUI-User-Guides/Fabric-Interconnect-Migration/4-2/b_migration_guide_for_cisco_ucs_fabric_interconnects_4_2.pdf

Below link should help https://www.cisco.com/c/en/us/td/docs/unified_computing/ucs/ucs-manager/GUI-User-Guides/Fabric-Interconnect-Migration/4-2/b_migration_guide_for_cisco_ucs_fabric_interconnects_4_2/m-migrating-and-upgrading-cisco-ucs-hardware-com...

https://www.cisco.com/c/en/us/td/docs/hyperconverged_systems/HyperFlex_HX_DataPlatformSoftware/Network_External_Storage_Management_Guide/b-hyperflex-network-and-external-storage-management-guide/m_external_storage_integration.html