Riverbed Cloud Services : System limitations and dependencies : Limitations on Microsoft Azure
  
Limitations on Microsoft Azure
These limitations apply to the SteelHead-c for Azure:
•  Multiple NICs, PBR, and WCCP are not supported.
•  The CCX-SUB-PERF-TIER5 models for Azure use multiple disks with FTS to achieve their large data store capacity. Because of this different disk layout, upgrading to these models requires clearing the data store. See Upgrading and downgrading SteelHead-c RiOS software