Specifications

QSSC-S4R Technical Product Specification BIOS Initialization
151
NUMA has to be enabled for any memory hot plug operations. Population rules for Memory Hot Add and Hot Replace
are described as follows:
16.2.11.3.1 Memory Hot Add in Hemisphere mode
x BIOS recommend to hot add two risers when System is in Hemisphere mode.
x If user hot adds only one riser. BIOS will log memory configuration error.
x When the user adds two risers, both risers must be inserted. Press the “Attention” button on one of them to bring
both the risers online.
x BIOS recommend to hot add two risers with identical memory configuration when System is in Hemisphere mode.
16.2.11.3.2 Memory Hot Add in 2-way Interleaving mode
x BIOS recommend to hot add two risers when System is in 2-way interleaving mode.
x If user hot adds only one riser, BIOS will log memory configuration error.
x When the user adds two risers, both risers must be inserted. Press the “Attention” button on one of them to bring
both the risers online.
16.2.11.3.3 Memory Hot Add in 4-way,8-way Interleaving Mode
Memory hot add is not supported in 4-way or 8-way interleaving mode. Since NUMA can not be enabled in 4-way and
8-way interleaving mode and NUMA has to be enabled for memory hot add.
16.2.11.3.4 Memory Hot Add in DIMM Sparing Configuration
x BIOS recommend to hot add one riser with which has memory configuration which supports DIMM Sparing when
System is in DIMM Sparing mode.
x If hot added riser does not have memory configuration which supports DIMM Sparing, BIOS will log memory
configuration error SEL. Power LED to Riser will light for a moment and then BIOS will power off that Riser.
16.2.11.3.5 Memory Hot Add in Rank Sparing Configuration
x BIOS recommend to hot add one riser which has memory DIMM configuration which supports Rank Sparing.
x If hot added riser does not have memory DIMM configuration which supports Rank Sparing, BIOS will log memory
configuration SEL. Power LED to Riser will light for a moment and then BIOS will power off that Riser.
16.2.11.3.6 Memory Hot Add in Intra Socket Mirroring Mode
x BIOS recommend to hot add two risers when System is in Intra Mirroring mode.
x Hot added two risers should have memory DIMM configuration which supports Intra Mirroring.
x When the user adds two risers, both risers must be inserted. Press the “Attention” button on one of them to bring
both the risers online.
x If user hot adds only one riser. BIOS will log configuration error. Power LED to Riser will light for a moment and
then BIOS will power off that Riser.
x If hot added two risers does not follow Intra mirroring configuration, BIOS will log SEL for memory configuration
error.
16.2.11.3.7 Memory Hot Add in Inter Socket Mirroring Mode
Memory hot add not supported on Inter mirroring mode. If user tries to hot add memory in Inter Socket Mirroring mode,
BIOS will log SEL for memory configuration error.
16.2.11.3.8 Memory Hot Add in Max Performance
x Memory hot add is supported in Max performance mode. One Riser can be hot added in max performance mode.
16.2.11.3.9 Memory Hot Replace in Intra Socket Mirroring Mode
x Memory Hot Replace is supported in Intra Socket Mirroring Mode. There is no timeout threshold for putting back
the replaced Riser.