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2 The Virtualization Cookbook for Red Hat Enterprise Linux 5.2

z/VM 5.3

z/VM 5.3 became generally available in June 2007. Scalability was extended to allow 256 GB

of real memory, a total of 8 TB of virtual storage, and 32 real processors. z/VM V5.3 also

added support for the Collaborative Memory Management Assist (CMMA) on the z9® EC and

the z9 BC processors or later.

Virtual Machine Resource Manager (VMRM) detects when

memory is constrained and notifies the Linux guests, which can then adjust their memory

consumption to help relieve the memory constraint.

In the previous major release (z/VM 5.2), many memory contention issues were removed with

the Control Program (CP) now using memory above 2 GB for a much broader set of

operations. Previously, guest pages had to be moved below 2 GB for many reasons, for

example in both standard I/O and Queued Direct I/O (QDIO). Now I/O can be performed

using buffers anywhere in real memory, and QDIO structures can reside above 2 GB, as can

most CP control blocks. These improvements offer constraint relief for large-real-memory

virtual server environments that are memory-intensive.

z/VM 5.4

z/VM 5.4, available in August 2008, provides major improvements when operating on

System z servers with large memory configurations. It improves scalability and can help

support increased workloads on IBM System z servers. This release exploits new capabilities

of the System z10™ including:

򐂰 Greater flexibility, with support for the new z/VM-mode logical partitions, allowing all

System z processor-types (CPs, IFLs, zIIPs, zAAPs, and ICFs) to be defined in the same

z/VM LPAR for use by various guest operating systems

򐂰 The capability to install Linux on System z from the HMC, which eliminates network setup

or a connection between an LPAR and the HMC

򐂰 Enhanced physical connectivity by exploiting all OSA-Express3 ports, thus helping to

service the network and reduce the number of required resources

z/VM 5.4 dynamic memory upgrade support allows real memory to be added to a running

z/VM system, thereby avoiding the need to shut down z/VM and its guests, deactivate the

LPAR, change its memory allocation, reactivate the LPAR, re-IPL z/VM, and restart its guests.

Memory can be added non-disruptively to individual guests that support the dynamic memory

reconfiguration architecture.

Read more about System z virtualization capabilities on the Web at:

http://www.vm.ibm.com

1.1 What is virtualization

Virtualization is the ability for a computer system to share resources so that one physical

server can act as many

virtual servers. z/VM allows the sharing of the mainframe’s physical

resources such as disk (DASD), memory (sometimes called storage), network adapters (OSA

cards) and CPU (CPs or IFLs). These resources are managed by a

hypervisor. The z/VM

hypervisor is called Control Program (CP).

When a user logs onto z/VM, the hypervisor creates a virtual machine which can run one of

many different operating systems. The two operating systems discussed in this book are the

z/VM native operating system, known as the Conversational Monitoring System (CMS), and

Linux. CMS can be thought of as a z/VM shell. Virtual machines running Linux as guests of a

z/VM host become the virtual servers.

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