Lots of new features with 2.1 - more information here:
https://www.cisco.com/en/US/docs/unified_computing/ucs/release/notes/UCS_28313.html
New Hardware Features in Release 2.1
Release 2.1(1a) adds support for the following:
•
Cisco UCS CNA M73KR-Q Adapter for B-series M3
•Cisco UCS M73KR-E Adapter for Cisco UCS B22 M3 and Cisco UCS B200 M3
•VIC 1225 Adapter for C-series
•C420 M3 Server
New Software Features in Release 2.1
Release 2.1(1a) adds support for the following:
•Storage
–UCSM based FC Zoning - Direct Connect Topologies
–Multi-Hop FCoE
–Unified Appliance Port
–Inventory and Discovery Support for Fusion-IO and LSI PCIe Mezzanine Flash Storage (for UCS M3 blades)
•C-series Single Wire Management
•Fabric
–Sequential Pool ID Assignment
–PV Count Optimization (VLAN Compression. Only available on 6248/6296 Fabric Interconnect)
–VLAN Group
–Multicast Policy with IGMP Snooping and Querier
–Org-Aware VLAN
–LAN/SAN Connectivity Policies for Service Profile Configuration
–VCON Enhancement
–Cisco CNA NIC Multi-receiving Queue Support
–VM FEX for KVM SRIOV
–VM FEX for Hyper-V SRIOV
•Operational enhancements
–Firmware Auto Install
–Mixed Version Support (For Infra and Server bundles firmware)
–Service Profile Renaming
–Fault Suppression
–UCSM Upgrade Validation Utility
–FSM Tab Enhancement
–Native JRE 64 bits Compatibility with OS and Browsers
–Lower Power Cap Minimum for B Series
–RBAC Enhancement
–CIMC is included in Host Firmware Package (Management Firmware Package deprecated).
–Implicit upgrade compatibility check
•Support for UCS Central
