178 OES 2 SP2: Installation Guidenovdocx (en) 7 January 201010.1.1 OES 2 SP2 VM Host ConsiderationsWhen you set up a virtual machine host for OES 2 SP2 VM guests, ensure that the host server hasthe following: Time synchronization: Set the server’s time configuration to the same reliable, externaltime source as the eDirectoryTM tree that the virtual machines on that host will be joining.To set the time source, use Yast > Network Services > NTP Time Configuration.The time source can be running NTP or Timesync. RAM: Enough memory to support each virtual machine that you want to run concurrentlyon the host server.For example, if you are installing one OES 2 SP2 virtual machine, you need a minimum of1 GB of memory (512 MB for the host plus 512 MB for the OES 2 Linux VM).If you are installing two virtual machines, and the first VM guest’s services need 1 GBwhile the second guest’s need 1.5 GB, you need 2.5 GB for the VM guests and 512 MBfor the host—a total of 3 GB. Disk Space: Enough disk space on the host for creating and running your VM guests.The default disk space required for an OES 2 SP2 VM guest is 4 GB and the defaultallocation for each VM guest in Xen is 10 GB, leaving approximately 6 GB for data files,etc. The space you need is dependent on what you plan to use the virtual server for andwhat other virtual storage devices, such as NSS volumes, that you plan to attach to it.10.1.2 Novell Storage Services ConsiderationsIf you want to set up Novell Storage ServicesTM (NSS) on the virtual machine, note the following: NSS can recognize physical, logical, or virtual devices up to 2 TB in size (where 1 TB = 2E40bytes = 1,099,511,627,776 bytes). In a virtual environment, the devices that you want to use for the NSS file system on the guestoperating system cannot exceed the 2 TB limit, even if the host operating system and guestoperating system can handle larger devices.For information, see “Device Size Limit” in the OES 2 SP2: NSS File System AdministrationGuide.10.1.3 Setup InstructionsAs mentioned in Chapter 10, “Installing, Upgrading, or Updating OES on a Xen-based VM,” onpage 177, you can use either a SLES 10 SP3 server or an OES 2 SP2 server as your VM host server.For setup procedures, see SLES 10 SP3: “Setting Up a Virtual Machine Host” (http://www.novell.com/documentation/sles10/book_virtualization_xen/data/cha_xen_virtualization_vhost_setup.html) in theVirtualization with Xen (http://www.novell.com/documentation/sles10/book_virtualization_xen/data/book_virtualization_xen.html) guide.or OES 2 SP2: “Chapter 9, “Installing OES as a Xen VM Host Server,” on page 175.”
