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HP Integrity Virtual Machines Installation, Configuration, and Administration > Chapter 2 Planning Your Virtual Machines
Allocating Resources to Guests |
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The way you allocate the physical resources to the guests determines the ultimate success of your configuration. For both performance and safety, spread the workload across devices. The VM Host reads the guest configuration from the guest configuration file at /var/opt/hpvm/guests/guestname. You can check the current configuration against your plans, adjusting the configuration for better performance and easier management. The guests must all share the same physical system with the VM Host. Therefore, it is useful to look at the resource requirements of all guests that will be running at the same time. Table 2–3 lists the types of information you need in order to create a guest, with space to enter your own guest information. Use the information from Table 2–1, VM Host System Resources Information to help you assess the resource requirements for your Integrity VM environment. Table 2-3 Guest Planning Worksheet
Note that this table reflects Table 2–2. Use the information from Table 2–2 to help you fill out your planning worksheet for each guest. The following sections present three example guests designed to run on the VM Host named compass, which is presented in Table 2-1. The three example guests are:
In the following sections, each guest is added to the planning chart, allowing you to assess the total requirements of all the guests running at the same time on the same VM Host system. The first example guest, compass1, has one virtual CPU, two virtual network devices, one of which is a dedicated network device. This distribution server requires both virtual disk storage (a logical volume) and a virtual DVD storage device. Table 2-4 shows the planning worksheet with the data for the first guest included. Table 2-4 Planning Worksheet for compass1
If the guest runs multiple applications with specific requirements for virtual devices, you might need to expand this chart. Information about the second guest, compass2, is entered into the next blank column in the worksheet, as shown in Table 2–5. This guest is a research and development system. It runs a multiprocessing operating system and has large memory requirements. It is a highly secure environment, and network usage is restricted to local machines. This virtual machine is an isolated environment for patching, upgrading, and testing software changes. Table 2-5 Planning Worksheet for compass2
Make sure that dedicated virtual devices (like the boot disk) are not the same on any other guests, and that the number of virtual CPUs and the amount of memory you specify do not exceed the amount that is available on the VM Host system when the guest is created. Note that the storage device for the compass2 guest is different from the compass1 guest, making it easier to manage the VM Host system when both guests are running at the same time, as well as providing a balanced workload. The third guest, compass3, is the system used by management and corporate operations. The application demands on this virtual machine vary greatly and the resource demands spike frequently. Network access is required and there are high I/O performance requirements. Table 2–6 shows the information for compass3 in the last column of the worksheet. Table 2-6 Planning Worksheet for compass3
The planning worksheet now shows all three guests side by side. Use the parameters from the VM Host system (Table 2–1) and those you record in the guest planning worksheet (Table 2–6) to assess the total requirements of the guests on the system. Total memory and disk space requirements include the guest requirements and the VM Host requirements. For more information about the total memory and disk space requirements, refer to “Installation Requirements” in Chapter 3. |
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