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Chapter 3
Maintaining the Server
Replacing Memory Risers
This section describes how to remove and replace memory risers. For information about replacing
DIMMs on the memory risers, see
This section includes the following topics:
•
•
•
The memory risers connect to motherboard sockets. There are two versions of memory riser available
for use in this server:
•
•
Memory Riser Population Guidelines
Figure 3-13
Each CPU controls eight Millbrook-2 DDR3 channels. There is one memory riser for each DDR3
channel.
Use the following population guidelines when installing or replacing memory risers:
•
•
•
•
•
•
OL-24342-01z
Memory Riser Population Guidelines, page 3-21
Identifying a Faulty Memory Riser or DIMM, page 3-22
Memory Riser Replacement Procedure, page 3-23
The two-DIMM riser is a passive riser with two DIMM sockets.
The four-DIMM riser is an active riser that utilizes an ASIC chipset to double the capacity to four
DIMM sockets.
shows the CPUs and memory riser sockets on the motherboard.
The server must have either all two-DIMM risers or all four-DIMM risers. Do not mix riser types.
Memory risers must be installed in pairs on paired DDR3 channels. The paired channels are as
follows:
–
CPU1— [A0:A1], [B0:B1], [C0:C1], [D0:D1]
–
CPU2— [A0:A1], [B0:B1], [C0:C1], [D0:D1]
Matched pairs of risers on paired DDR3 channels must have identical DIMM configurations.
For example, the DIMM configurations must be identical on risers in A0:A1; however, the A0:A1
configurations do not have to be identical with the B0:B1 configurations.
The minimum riser configuration is one matched pair of risers on either CPU1 or CPU2. Either CPU
can boot and run from a single matched pair of risers.
Any riser installed on a socket that is controlled by an absent CPU is not recognized.
Although it is not required, for optimal performance distribute riser pairs evenly across the CPUs.
Follow this recommended installation order (see
1.
CPU1 [A0:A1] and CPU2 [A0:A1]
2.
CPU1 [C0:C1] and CPU2 [C0:C1]
CPU1 [B0:B1] and CPU2 [B0:B1]
3.
CPU1 [D0:D1] and CPU2 [D0:D1]
4.
Replacing DIMMs, page
3-25.
Figure
3-13):
Cisco UCS C260 Server Installation and Service Guide
Installing or Replacing Server Components
3-21
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