Enabling Solaris Resource Manager Using srmadm

The srmadm command allows the administrator to control the operating state and system-wide configuration of Solaris Resource Manager. This command is typically used during transition to run-level 2 or 3 from within the Solaris Resource Manager init.d(4) script /etc/init.d/init.srm. It is run to ensure that appropriate values for all parameters are set each time the system is booted, and to ensure that the Solaris Resource Manager system will be enabled prior to users having access to the system. The srmadm command is also used to administer the global Solaris Resource Manager parameters. See the srmadm(1MSRM) man page for a list of the parameters that can be set using srmadm. The srmadm commands issued in the Solaris Resource Manager init.d script will:

• Open the limits database. Up until this point, any processes that are started are attached automatically to a surrogate root lnode. The surrogate root lnode is used to ensure that there is always an lnode available to connect processes to, regardless of the operational state of Solaris Resource Manager. For this reason, it is important that the limits database be opened before any non-root processes are started. When the limits database is opened, the values in the usage attributes in the surrogate root lnode are added into their counterparts in the real root lnode. A limitation of this technique is that any net decrease in usage will not be counted. This ensures that usage alterations prior to the limits database being opened are not discarded.

• Enable limit enforcement.

• Set the parameters which control the behavior of the Solaris Resource Manager SHR scheduler, for example, the usage decay rate.

• Enable the SHR scheduler. Prior to this, processes in the SHR scheduling class are scheduled in a simple round-robin fashion and the CPU entitlements set within the Solaris Resource Manager system have no effect.

Refer to Global Solaris Resource Manager Parameters via srmadm for some common invocations of the srmadm command.