SuperCluster M8 and SuperCluster M7 employ DIMM sparing technology. DIMM sparing provides a mechanism to automatically unconfigure a failed DIMM without downtime. DIMM sparing reserves the space of one DIMM for use in the event of a failed DIMM. Due to the requirements of DIMM sparing, the amount of available memory reported is slightly less than the amount of memory that is calculated based on the quantity and capacity of the DIMMs.
Every CMIOU has 16 memory slots.
• SuperCluster M8 – Each CMIOU is fully populated with 64 GB DIMMs, for a total of 1 TB (1024 GB) of memory in each CMIOU, with 960 GB available after DIMM sparing.
• SuperCluster M7 – Each CMIOU is fully populated with 32 GB DIMMs, for a total of 512 GB of memory in each CMIOU, with 480 available after DIMM sparing.
The amount of memory resources that you have available for domains depends on these factors:
The number of PDomains in the system
The number of CMIOUs in each PDomain
The domain configuration on each PDomain
To determine the memory resources for a particular SuperCluster configuration, refer to the applicable Domain Specifications in these sections: