HP Superdome 2 Partitioning Administrator Guide (5900-2540, December 2012)

or, for this example, run the following command.
# # ioscan -m resourcepath | grep 48/0/0/2/0
48/0/0/2/0 0x900010002ffff8e iorp-9/1/0/0/2
48/0/0/2/0/0 0x90001000203ff85 ioslot-9/1/3
Memory
There are two major types of memory addressing, Socket Local Memory (SLM), and InterLeaved
Memory (ILM). With SLM, entire memory address ranges are from a single socket. For best
performance, memory and CPU-cores from the same sockets must be assigned to a vPar. ILM is
an address range of memory whose adjacent addresses reside on one or more sockets in the
underlying nPartition.
Memory Granularity
The nPartition memory is divided into multiple memory granules by firmware to assign memory
easily to vPars. The size of these memory granules can be optionally specified by the user. Memory
granularity refers to the size of these memory granules.
NOTE: The memory granules are not the actual memory DIMMs.
You can specify the granularity for SLM and ILM separately. However, the following applies to
both types of memory:
• Memory granularity is specified during the creation of nPartition. Any modification thereafter
requires you to reboot the nPartition.
• The minimum values (ILM and SLM granularity) are 256 MB.
• The default value is OS dependent and may be adjusted based on the total memory available
in the nPartition.
• Memory is assigned to virtual partitions in multiples of granule sizes.
HP recommends to retain the default memory granularity value chosen by the system, unless there
is a specific requirement to change it.
Assigning Memory to a vPar
• The -a mem::size option is used to assign size megabytes of ILM to a vPar.
• The -a socket:socket_id:mem::size option assigns size megabytes of SLM from socket
socket_id to a vPar.
86 Planning Your System for Virtual Partitions