PS5000 Hardware Maintenance Maintaining Control Modules3–10Once you remove a control module, place it on a surface that is protected fromelectrostatic charge.If the array will permanently operate with only one control module, you mustinstall a blank control module in the empty slot. You can order a blank from yourarray support provider. For proper cooling, do not leave a control module slotempty.Installing a Control ModuleYou may need to install a control module as part of an upgrade from a singlecontrol module array to a dual control module array or for control modulemaintenance, such as replacing a failed control module.Notes: You can upgrade to a dual control module array without shutting down thearray.Only install control modules of the same type in a PS5000 array, eitherType 4 or Type 5. Do not mix control module types in an array.Make sure the control module type is compatible with the disk type.Type 4 control modules are used only with SAS disks (black disk releasebutton).Type 5 control modules are used only with SATA disks (gray diskrelease button).Control modules are installed vertically in a PS5000 array, with the latchmechanism facing the adjacent power supply and cooling moduleBefore removing a control module:• Make sure the firmware on the control module’s compact flash card matchesthe firmware running on the already-installed control module. SeeMaintaining Control Module Firmware on page 3-4.• If you are replacing a failed control module, be sure to remove the compactflash card from the failed control module and install it in the replacementcontrol module. This will ensure that the new control module is running thecorrect firmware.• If you are upgrading to a dual control module array, remove the blank controlmodule from the slot. See the instructions in Figure 3-5 for opening the latch.• Attach an electrostatic wrist strap (see Using an Electrostatic Wrist Strap onpage 1-4).To install a control module, refer to the instructions in Figure 3-6.