Chapter 1: Introduction 1-5 2U Twin 2 : System Notes As a 2U Twin 2 confi guration, the 2021TM-BTRF/BIBXRF is a unique server system. With four system boards incorporated into a single chassis acting as four separate nodes, there are several points you should keep in mind. Nodes Each of the four serverboards act as a separate node in the system. As independant nodes, each may be powered off and on without affecting the others. In addition, each node is a hot-swappable unit that may be removed from the rear of the chassis. The nodes are connected to the server backplane by means of an adapter card. Note: a guide pin is located between the upper and lower nodes on the inner chassis wall.
This guide pin also acts as a “stop” when a node is fully installed. If too much force is used when inserting a node this pin may break off. Take care to slowly slide a node in until you hear the “click” of the locking tab seating itself. System Power A single 1200W power supply is used to provide the power for all four serverboards. Each serverboard however, can be shut down independently of the other with the power button on its own control panel. As an option, you may add an additional 1200W power supply module for power redundancy. SATA Backplane/Drives As a system, the 2021TM-BTRF/BIBXRF supports the use of twelve SATA drives.
A single SATA backplane works to apply system-based control for power and fan speed functions, yet at the same time logically connects a set of three SATA drives to each serverboard. Consequently, RAID setup is limited to a three-drive scheme (RAID cannot be spread across all twelve drives). See the Drive Bay Installation/ Removal section in Chapter 6 for the logical hard drive and node confi guration. 1-7