Red Hat LINUX VIRTUAL SERVER - FOR ENTERPRISE LINUX 5.2 REV 05-2008 Manual do Utilizador descarregar pdf (Página 21)

System z kernel features - Usability

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Standby CPU activation/deactivation (kernel 2.6.25)

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With this feature it is possible to make use of standby CPUs for instruction

execution.

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A CPU can be in one of the states "configured", "standby", or "reserved". Before

a CPU can be used for instruction execution it must be in "configured" state.

Previously, the kernel was limited to operate only with "configured" CPUs. With

this feature it is possible to change the state of "standby" CPUs to "configured"

state and vice versa via a sysfs attribute.

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This support is available only on IBM System z10, when running Linux on

System z in an LPAR.

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Shutdown Actions Interface (kernel 2.6.25)

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The new shutdown actions interface allows to specify for each shutdown trigger

(halt, power off, reboot, panic) one of the five available shutdown actions (stop,

ipl, reipl, dump, vmcmd).

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A sysfs interface under /sys/firmware is provided for that purpose.

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Possible use cases are e.g. to specify that a vmdump should be automatically

triggered in case of a kernel panic or the z/VM logoff command should be

executed on halt.

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Red Hat LINUX VIRTUAL SERVER - FOR ENTERPRISE LINUX 5.2 REV 05-2008 Manual do Utilizador Página 21