Overview of the EMX0 PCIe Gen3 I/O expansion drawer

The EMX0 PCIe Gen3 I/O expansion drawer (EMX0 PCIe3 expansion drawer) is a 482.6 mm (19 in), 4U PCIe Gen3 I/O drawer. Each EMX0 PCIe3 expansion drawer provides up to 12 PCIe Gen3 adapter slots.

The EMX0 PCIe3 expansion drawer is connected to a system via one or more expansion drawer cable pairs. Each pair provides a single x16 PCIe Gen3 link between the system and the EMX0 PCIe3 expansion drawer. The number of extra PCIe slots that are provided and the number of expansion drawer cable pairs needed depends on the I/O module configuration of the EMX0 PCIe3 expansion drawer.

Ensure that a PCIe3 cable adapter is installed in the host system before you install the EMX0 PCIe3 expansion drawer.

For all systems except the 9040-MR9 or 9080-M9S, you must power off the system to install the PCIe3 cable adapter.

To install a PCIe3 cable adapter to accommodate an EMX0 PCIe3 expansion drawer, see the following procedures:

If your system is managed by an HMC, see Installing a part by using the HMC.
If your system is not managed by an HMC, see PCIe adapters.
For PCIe adapter placement rules and slot priorities for your system or expansion drawer, see PCIe adapter placement rules and slot priorities.

Note: To remove or relocate an EMX0 PCIe3 expansion drawer, the system power must be turned off for all configurations.