Chapter 3. Planning
59
Both ports in a memory-board assembly must have the same total amount of
memory. Partial mirroring is not supported. If the same total amount of
memory is not detected at boot, memory mirroring is automatically disabled
by the system.
The DIMMs in partner banks across the two ports must be identical.
You must install two pairs of DIMMs at a time. These four DIMMs (known as a
bank
) must be identical. Table 3-4 shows the pairs that are in each bank.
Table 3-4 DIMMs that form a bank
Hot-swap memory
The hot-swap memory feature allows you to replace failed DIMMs without turning
off the server. Hot-swap memory is operating system independent.
The rules for hot-swap are as follows:
Memory mirroring must be enabled in the Configuration/Setup utility.
The configuration rules for memory mirroring apply here, specifically that the
DIMMs in partner banks across the two ports must be identical. See “Memory
mirroring” on page 58.
When replacing a failed DIMM, you do not have to replace the other DIMM
within the bank. Ensure that the new DIMM is the same type and size as the
other DIMM within the bank.
If a problem with a DIMM is detected, light path diagnostics will light the
system-error LED on the front of the server, indicating that there is a problem and
guiding you to the defective DIMM. When this occurs, first identify the defective
DIMM and then remove and replace the DIMM.
Bank
DIMM pairs (see Table 3-3)
1
1 and 2 (DIMMs 1, 14, 15, 28)
2
3 and 4 (DIMMs 2, 13, 16, 27)
3
5 and 6 (DIMMs 3, 12, 17, 26)
4
7 and 8 (DIMMs 4, 11, 18, 25)
5
9 and 10 (DIMMs 5, 10, 19, 24)
6
11 and 12 (DIMMs 6, 9, 20, 23)
7
13 and 14 (DIMMs 7, 8, 21, 22)
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