With this version of Integrity VM, system administrators can set memory parameters that allow guest memory allocation to be changed dynamically; that is, without rebooting the guest.
Normally, guests use a fixed amount of memory. That memory is allocated when the virtual machine is started and locked down so it cannot be paged or swapped. Once the memory is locked down, the VM Host cannot make it available to other virtual machines. The VM Host supports a fixed number of running virtual machines based on the amount of memory in the VM Host system and the number and size of the virtual machines.
Dynamic memory allows you to change the amount of physical memory in use by a virtual machine without rebooting the virtual machine. In this release of Integrity VM, the dynamic memory feature is available on HP-UX guests only. In order to use dynamic memory, the guest must have the guest management software installed.
For example, this feature allows a guest that is a Servicegard node to be used as a standby server for multiple Serviceguard packages. When a package fails over to the guest, the guest memory can be changed to suit the requirements of the package before, during, and after the failover process.
For information about enabling and using dynamic memory, see the HP Integrity Virtual Machines Installation, Configuration, and Administration manual.
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