PS4100 Hardware Maintenance Guide Basic Storage Array Information5Table 2 Array Back Panel FeaturesShutting Down and Restarting an ArrayA PS Series array includes redundant, hot-swappable drives, power supplies, and control modules (in a dualcontrol module array). You can remove a redundant component without affecting operation if a functioningcomponent is available. Otherwise, it is recommended that you cleanly shut down the array and turn offpower before removing a component.Note: When an array is shut down, any volumes with data on the array will be set offline until the array issuccessfully restarted. This may affect initiators that are connected to the volumes.1. Do one of the following:• Use telnet or SSH to connect to a functioning IP address assigned to a network interface on thearray. Do not connect to the group IP address.• Use the null modem cable shipped with the array to connect to the serial port on the active controlmodule (ACT LED is green) to a console or a computer running a terminal emulator.Make sure the serial line characteristics are as follows:• 9600 baud• One STOP bit• No parity• 8 data bits• No flow control2. Log in to an account with read-write access, such as the grpadmin account.Item Feature Identifier Description1 Power switches (oneon each power supply)None The power switch controls the power supply output tothe array.2 Power supply andcooling fan modulePSU0 (left)PSU1 (right)700 Watt power supply.For more information, see Power Supply LEDs on page29.3 Type 12 ControlModuleCM0 (top)CM1 (bottom)The control module provides:• a data path between the array and the applicationsusing the storage• array management functions for your array4 Control ModuleRelease LeverNone Enables you to remove the control module from thearray.