12Single-Controller ModelsSingle-Controller models are designated by an “S” at the end of their model number. Thesecond controller slot is filled with a dummy cage.2U models3U modelsUpgrading Single-Controller to Dual-Controller SystemIf the model name of a Single Controller Unified Storage / expansion enclosure is designatedwith the letter “S”, it can be upgraded into a Dual-Controller configuration by adding anothercontroller module and firmware upgrade (see software manual).For details, please contact your vendor.Connection between Unified Storage System andExpansion EnclosuresThe following rule applies when connecting Unified Storage and expansion enclosure (s): Dual Controller Unified Storage System connects to Dual Controller expansionenclosure. Single Controller Unified Storage System connects to Single Controller expansionenclosure.ChassisThe chassis is rugged constructed and divided into front and rear sections. The chassis isdesigned to be installed into a rack or cabinet.
