|  |  |  |  | 
| R | 
|  | 
|  | relay panels, replacing (  ) | 
|  | 
|  | removing | 
|  |  | disk drives (  ) | 
|  |  | dual-controller configurations (  ) | 
|  |  | logical volumes (  ) | 
|  |  | nodes (  ) | 
|  |  | storage systems (  ) | 
|  |  | virtualization engines (  ) | 
|  | 
|  | replacing | 
|  |  | accessory trays (  ) | 
|  |  | batteries (  ) | 
|  |  | cards in DSPs (  ) | 
|  |  | chassis (  ) (  ) | 
|  |  | controllers (  ) | 
|  |  | cooling units (  ) (  ) | 
|  |  | disk drives (  ) | 
|  |  | DSPs (  ) | 
|  |  | Ethernet cables (  ) (  ) | 
|  |  | Ethernet hubs (  ) (  ) | 
|  |  | expansion cabinets (  ) | 
|  |  | fan assemblies (  ) | 
|  |  | GBICs (  ) | 
|  |  | host adapters (  ) | 
|  |  | node-to-switch components (  ) | 
|  |  | power cables (  ) (  ) | 
|  |  | power units (  ) (  ) | 
|  |  | service processor panels (  ) | 
|  |  | services processors (  ) | 
|  |  | SFPs (  ) | 
|  |  | storage array -to-switch fiber-optic cables (  ) | 
|  |  | storage service processor (  ) | 
|  |  | switches (  ) | 
|  |  | unit interconnect cards (  ) | 
|  |  | USB flash disks (  ) | 
|  |  | USB relay panels (  ) | 
|  |  | virtualization engines (  ) | 
|  | 
|  | requirements, SE 6920 systems (  ) | 
|  | 
|  | restrictions, SE 6920 systems (  ) |