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Oracle® VM Server for SPARC 3.4 Administration Guide

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Updated: August 2016

Using Resource Groups

A resource group provides an alternate way to view the resources in a system. Resources are grouped based on the underlying physical relationships between processor cores, memory, and I/O buses. Different platforms, and even different platform configurations within the same server family, such as SPARC T5-2 and SPARC T5-8, can have different resource groups that reflect the differences in the hardware. Use the ldm list-rsrc-group command to view resource group information.

The membership of resource groups is statically defined by the hardware configuration. You can use the ldm remove-core and ldm remove-memory commands to operate on resources from a particular resource group.

  • The remove-core subcommand specifies the number of CPU cores to remove from a domain. When you specify a resource group by using the –g option, the cores that are selected for removal all come from that resource group.

  • The remove-memory subcommand removes the specified amount of memory from a logical domain. When you specify a resource group by using the –g option, the memory that is selected for removal all comes from that resource group.

For information about these commands, see the ldm(1M) man page.

For examples, see Listing Resource Group Information.

Resource Group Requirements and Restrictions

The resource group feature is available only on SPARC T5 servers, SPARC T7 series servers, SPARC M5 servers, SPARC M6 servers, SPARC M7 series servers, SPARC S7 series servers, and Fujitsu M10 servers.

    The resource group feature has the following restrictions:

  • It is not available on UltraSPARC T2, UltraSPARC T2 Plus, SPARC T3, and SPARC T4 platforms.

  • The ldm list-rsrc-group command does not show any information about those unsupported platforms and the –g variants of the ldm remove-core and ldm remove-memory commands are not functional.

  • On supported platforms, specifying _sys_ in place of domain-name moves all system memory to free memory in a different resource group. This command is a no-op on unsupported platforms.