Chapter
Memory Mirroring and RAS
•The CPUs support memory mirroring only when Channels A and B on CPU 1 are populated with DIMMs that are identical in configuration, size, and speed. Do not populate channel C. If three channels are populated with DIMMs, memory mirroring is automatically disabled.
•If DIMMs on CPU 2 are populated, channels D and E must be populated with DIMMs that are identical in configuration, size, and speed. Do not populate channel F. If three channels are populated with DIMMs, memory mirroring is automatically disabled.
•If memory mirroring is used, the DRAM size is reduced by 50 percent for reasons of reliability. Memory sparing is not supported.
DIMM Installation Procedure
To install or replace a DIMM, follow these steps:
Note Refer to the DIMM population rules before removing or installing DIMMs. See the “Memory Performance Guidelines and Population Rules” section on page
Step 1 Remove an existing DIMM:
a.Power off the server as described in the “Shutting Down and Powering Off the Server” section on page
b.Disconnect all power cords from the power supplies.
c.Slide the server out the front of the rack far enough so that you can remove the top cover. You might have to detach cables from the rear panel to provide clearance.
Caution If you cannot safely view and access the component, remove the server from the rack.
d.Remove the top cover as described in the “Removing and Replacing the Server Top Cover” section on page
e.Remove the air duct that sits over the CPUs and set it aside. To remove the duct, depress the plastic latch on each end of the duct to disengage it from the chassis standoff posts.
f.Push down on the ejector levers at both ends of the DIMM slot.
g.Grasp the DIMM by its top corners and remove it from the server. Place the DIMM on an antistatic mat or in antistatic packaging.
Step 2 Install a DIMM:
a.With the ejector levers at both ends of the DIMM slot fully open, orient the DIMM’s alignment notch with the alignment key in the DIMM slot (see Figure
b.Press down on both top corners of the DIMM simultaneously until the ejector levers click and lock in place on the DIMM.
c.Replace the air duct and the top cover. When you replace the air duct, align the holes on each end of the duct with the chassis standoff posts, then press down on both ends until the plastic latches engage with the posts.
d.Replace the server in the rack, replace power cords and any other cables, and then power on the server by pressing the Power button.
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