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Creating and Using Oracle® Solaris Zones

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Updated: August 2019
 
 

Resource Management With Non-Global Zones

This section covers resource controls, the Fair Share Scheduler (FSS), and extended accounting.

Resource Controls Used in Non-Global Zones

For additional information about using a resource management feature in a zone, also refer to the chapter that describes the capability in Administering Resource Management in Oracle Solaris 11.4.

Any of the resource controls and attributes described in the resource management chapters can be set in the /etc/project file, NIS map, or LDAP directory service in all zones. The settings for a given zone affect only that zone. A project running autonomously in different zones can have controls set individually in each zone. For example, Project A in the global zone can be set project.cpu-shares=10 while Project A in a non-global zone can be set project.cpu-shares=5. You could have several instances of rcapd running on the system, with each instance operating only on its zone.

The resource controls and attributes used in a zone to control projects, tasks, and processes within that zone are subject to the additional requirements regarding pools and the zone-wide resource controls.

A non-global zone can be associated with one resource pool, although the pool need not be exclusively assigned to a particular zone. Multiple non-global zones can share the resources of one pool. Processes in the global zone, however, can be bound by a sufficiently privileged process to any pool. The resource controller poold only runs in the global zone, where there is more than one pool for it to operate on. The poolstat utility run in a non-global zone displays only information about the pool associated with the zone. The pooladm command run without arguments in a non-global zone displays only information about the pool associated with the zone.

Zone-wide resource controls do not take effect when they are set in the project file. A zone-wide resource control is set through the zonecfg utility.

Fair Share Scheduler on a System With Zones Installed

This section describes how to use the fair share scheduler (FSS) with zones to balance CPU use.

Share Balance Between Zones

You can use zone.cpu-shares to assign FSS shares in the global zone and in non-global zones. If FSS is the default scheduler on your system and shares are not assigned, each zone is given one share by default. If you have one non-global zone on your system and you give this zone two shares through zone.cpu-shares, that defines the proportion of CPU which the non-global zone will receive in relation to the global zone. The ratio of CPU between the two zones is 2:1.

Extended Accounting on a System With Zones Installed

The extended accounting subsystem collects and reports information for the entire system (including non-global zones) when run in the global zone. The global administrator can also determine resource consumption on a per-zone basis.

The extended accounting subsystem permits different accounting settings and files on a per-zone basis for process-based and task-based accounting. The exacct records can be tagged with the zone name EXD PROC ZONENAME for processes, and the zone name EXD TASK ZONENAME for tasks. Accounting records are written to the global zone's accounting files as well as the per-zone accounting files. The EXD TASK HOSTNAME, EXD PROC HOSTNAME, and EXD HOSTNAME records contain the uname –n value for the zone in which the process or task executed instead of the global zone's node name.