Chapter 1 DescriptionModulesScalar i500 User’s Guide 14ModulesScalar i500 libraries are modular, and you can increase the size at anytime. The three base systems for the Scalar i500 library are as follows:• The 5U library, consisting of a control module• The 14U library, consisting of a 5U control module and a 9Uexpansion module• The 23U library, consisting of a 5U control module and two 9Uexpansion modulesThese configurations can be scaled up by adding 9U expansion modulesto a maximum rack height of 41U. Expansion modules provide additionalcapacity as your storage and tape drive requirements change. See Figure4 on page 15 for an illustration of library scalability. For information oninstalling, removing, and replacing modules, see Installing, Removing,and Replacing on page 170.Each module has a specific number of fixed storage slots, I/E stationslots, and tape drive slots available. See Library Capacity on page 365 forthe number of slots available for each library configurations.Control Module 1 The control module is required in any Scalar i500 library configuration.The control module contains the robotic controls, library control blade(LCB), and touch screen display. The control module also contains animport/export (I/E) station, fixed storage slots, tape drives, and at leastone power supply.Expansion Modules 1 Expansion modules are supplementary modules that can be stackedabove or below the control module. Each expansion module containsfixed storage slots, tape drive slots, and power supply slots.The I/Estations on expansion modules are included and may be configured asstorage. Expansion modules also contain bays for optional Fibre ChannelNote: Slot counts in this User’s Guide do not include five inaccessibleslots in the bottom row of any library configuration. For moreinformation about these slots, see Unused Slots on page 131.
