IBM 887022X Maintenance Manual - Page 123
Notes, Attention, Advanced, Setup, Memory, Settings, Mirroring, Disabled, Enabled
UPC - 000435151957
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5. The pair of DIMMs added to a bank (see "DIMM banks", Figure 57 on page 106) must be of the same size and clock speed. 6. If the server has two SMP Expansion Modules installed, you can only hot-add memory to the top SMP Expansion Module. 7. You can enable the hot-add and hot-replace memory features or you can enable the fastpath memory feature, but you cannot enable both at the same time. The fastpath memory feature increases memory performance. Enabling the memory hot-add feature: Before you can hot-add DIMMs, the memory hot-add feature must be enabled, and memory mirroring must be disabled. Notes: 1. For a multi-node system, you must complete the following instructions for the primary system when it is not in a merged state. Hot-add and memory mirroring should both be disabled on any additional systems within the multi-node partition. 2. When hot-adding to a multi-node setup, do not open more than one DIMM access door at a time. Complete the hot-add operation in one system prior to starting any hot-add operations for any other system in the multi-node partition. 3. Ensure that you hot-add DIMMs in pairs of two; that the new DIMMs are the same size and clock speed; and that the port to which you intend to add them is empty. Attention: If two SMP Expansion Modules are installed in a server, you cannot hot-replace or hot-add the DIMMs in the lower SMP Expansion Module because accessing the lower SMP Expansion Module requires removing the upper SMP Expansion Module, a procedure that requires turning off the server. See "Removing and replacing DIMMs" on page 108 for information on how to remove and replace DIMMs while the server is turned off. Complete the following steps to ensure that these features are correctly configured: 1. Start the Configuration/Setup Utility. 2. Select Advanced Setup from the menu. 3. Select Memory Settings. 4. In the next window select Memory Mirroring Settings. 5. Ensure that Memory Mirroring is set to Disabled. 6. Press Esc. 7. Ensure that Memory Hot Add is set to Enabled. Note: A minimum of 4 GB of memory must be installed in the server in order for hot-add memory to be available; otherwise, the option will not appear in the Configuration/Setup Utility program. 8. Save and exit the Configuration/Setup Utility. Hot-adding DIMMs: Complete the following steps to hot-add DIMMs to the server's SMP Expansion Module: 1. Review the information in "Installation guidelines" on page 79, "Handling static-sensitive devices" on page 80, and "Safety information" on page 257. 2. Pull out on the quick release latches on each side of the server; then, pull the server out of its rack enclosure until it stops. 3. Open the top cover. Chapter 4. Installing options 113