Setting up hotplug memory

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LPAR mode z/VM guest

Before you can use hotplug memory on your Linux® instance, you must define this memory as hotplug memory on your physical or virtual hardware.

Defining hotplug memory to an LPAR

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You use the Hardware Management Console (HMC) to define hotplug memory as reserved storage on an LPAR.

For information about defining reserved storage for your LPAR, see the Processor Resource/Systems Manager™ Planning Guide, SB10-7041 for your mainframe.

Defining hotplug memory to z/VM

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In z/VM®, you define hotplug memory as standby storage.

There is also reserved storage in z/VM, but other than reserved memory defined for an LPAR, reserved storage that is defined in z/VM is not available as hotplug memory.

Always align the z/VM guest storage with the Linux memory block size. Otherwise, memory blocks might be missing or impossible to set offline in Linux.

For information about defining standby memory for z/VM guests see the DEFINE STORAGE section in z/VM: CP Commands and Utilities Reference, SC24-6268.