LPAR directories and attributes

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6.18 LPAR mode

There are hypfs directories and attributes with hypervisor information for Linux® in LPAR mode.

Figure 1 illustrates the file system tree that is created for LPAR.

Figure 1. The hypervisor file system for LPAR

This graphic shows a directory structure that is explained in the sections that follow.
update
Write-only file to trigger an update of all attributes.
cpus/
Directory for all physical cores.
cpus/<core_ID>
Directory for one physical core. <core_ID> is the logical (decimal) core number.
type
Type of the physical core, such as CP or IFL.
mgmtime
Physical-LPAR-management time in microseconds (LPAR overhead).
hyp/
Directory for hypervisor information.
hyp/type
Type of hypervisor (LPAR hypervisor).
systems/
Directory for all LPARs.
systems/<lpar name>/
Directory for one LPAR.
systems/<lpar name>/cpus/<core_ID>/
Directory for the virtual cores for one LPAR. The <core_ID> is the logical (decimal) core number.
type
Type of the logical core, such as CP or IFL.
mgmtime
LPAR-management time. Accumulated number of microseconds during which a physical core was assigned to the logical core and the core time was consumed by the hypervisor and was not provided to the LPAR (LPAR overhead).
cputime
Accumulated number of microseconds during which a physical core was assigned to the logical core and the core time was consumed by the LPAR.
onlinetime
Accumulated number of microseconds during which the logical core has been online.
Note: For LPARs with multithreading enabled, the entities in the cpus directories represent hardware cores, not threads.
Note: For older machines, the onlinetime attribute might be missing. Generally, it is advantageous for applications to tolerate missing attributes or new attributes that are added to the file system. To check the content of the files, you can use tools such as cat or less.