Citrix Systems 6.2.0 manual VM Block Devices

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3.4.1. VM Block Devices

In the para-virtualized (PV) Linux case, block devices are passed through as PV devices. XenServer does not attempt to emulate SCSI or IDE, but instead provides a more suitable interface in the virtual environment in the form of xvd* devices. It is also sometimes possible (depending on the OS) to get an sd* device using the same mechanism, where the PV driver inside the VM takes over the SCSI device namespace. This is not desirable so it is best to use xvd* where possible for PV guests (this is the default for Debian and RHEL).

For Windows or other fully virtualized guests, XenServer emulates an IDE bus in the form of an hd* device. When using Windows, installing the XenServer Tools installs a special PV driver that works in a similar way to Linux, except in a fully virtualized environment.

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Contents Citrix XenServer 6.2.0 Virtual Machine Users Guide Trademarks Contents VM Migration with XenMotion and Storage XenMotion Importing the Demo Linux Virtual Appliance Windows VM Release Notes Setting Up a Red Hat Installation Server Overview About this DocumentXenServer Documentation Creating VMs Virtual MachinesOther Methods of VM Creation XenServer Tools Importing an Exported VMPage Supported Guests, Virtual Memory, and Disk Size Limits Supported Guests and Allocating ResourcesOperating System Minimum Maximum Minimum Disk Space 4GB 8GB Experimental Guests Operating SystemXenServer Product Family Virtual Device Support Deprecated GuestsVirtual device Linux VMs Windows VMs VM Block Devices Basic Procedure for Creating a Windows VM Creating Windows VMsAvailable Windows Templates Template Name DescriptionAttaching an ISO Image Library Using XenCenter to Create a VMTo create a Windows 7 32-bit VM Page Using the CLI to Create a Windows VM Installing a Windows VM from an ISO Repository Using the CLICreating Linux VMs Install From Network From CD Repository Distribution VendorCreating a Linux VM by Installing from a Physical CD/DVD Creating a Linux VM by Installing From an ISO Image Network Installation NotesTo install Debian using a preseed file Advanced Operating System Boot ParametersTo install Rhel Using a Kickstart File Installing the Linux Guest Agent To install the guest agentAdditional Installation Notes for Linux Distributions Linux Distribution Installation NotesPreparing to Clone a Linux VM Additional Debian NotesMachine Name IP addressPage VM Migration with XenMotion and Storage XenMotion XenMotion and Storage XenMotionXenMotion Storage XenMotionLive VDI Migration Migrating a VM using XenCenterLimitations and Caveats To Move Virtual Disks To uninstall the XenServer Tools Updating VMsUpdating Windows Operating Systems Updating XenServer Tools for Windows VMsPage Creating a vApp using XenCenter VAppsManaging vApps in XenCenter Creating vAppsStart and shutdown vApps using XenCenter Deleting vApps using XenCenterDeleting vApps To start a vAppTo export a vApp Importing and Exporting vAppsTo import a vApp VM Boot Behavior Persist XenDesktop Private Desktop ModeReset XenDesktop Shared Desktop Mode Advanced Notes for Virtual MachinesInstalldir/xensetup.exe /S /norestart Windows Volume Shadow Copy Service VSS provider Connecting to a Windows VM Using Remote DesktopTo enable the Windows XenServer VSS provider To Enable Remote Desktop on a Windows VMTime Handling in Windows VMs Time Handling in Linux VMsTo set individual Linux VMs to maintain independent times Installing a VM from Reseller Option Kit BIOS-locked MediaGuest OS Dependent wallclock Independent wallclock Using XenCenter Preparing for Cloning a Windows VM Using VSSUsing the CLI Assigning a GPU to a Windows VM for Use with XenDesktop Cloning Windows VMsTo assign a GPU to a Windows VM using XenCenter To assign a GPU to a Windows VM using xe CLITo detach a Windows VM from a GPU using XenCenter To detach a Windows VM from a GPU using the xe CLIDetach the GPU from the VM by entering the following Importing the Demo Linux Virtual Appliance To Import the Demo Linux Virtual Appliance Using XenCenterUseful Tests Page Supported Formats Importing and Exporting VMsFormat Description Open Virtualization Format OVF and OVA Attribute DescriptionDisk Image Formats VHD and Vmdk XVA FormatOperating System Fixup XVA Version 1 FormatImporting VMs Transfer VMTo use the RawVDI transfer protocol To Import VMs from OVF/OVA using XenCenter Importing VMs from OVF/OVAPage To Import VMs from a Disk Image using XenCenter Importing Disk ImagesTo Import VMs from XVA Files VM using XenCenter Importing VMs from XVAExporting VMs To Import a VM from XVA using the xe CLIExporting VMs as OVF/OVA To Export VMs as OVF/OVA using XenCenter To Export VMs as XVA Files using XenCenter Exporting VMs as XVATo Export VMs as XVA Files using the xe CLI Appendix A. Windows VM Release Notes Release NotesAppendix B. Linux VM Release Notes Red Hat Enterprise Linux 4.5 toRed Hat Enterprise Linux Preparing a Rhel 4.5 to 4.8 guest for cloningCentOS Oracle Enterprise LinuxSuse Enterprise Linux 10 SP1 Suse Enterprise Linux 10 SP3Ubuntu Creating an ISO on a Linux computer Appendix C. Creating ISO ImagesOn a Windows computer Appendix D. Enabling VNC for Linux VMs Enabling a Graphical Console on Debian Squeeze VMsDetermining the Location of your VNC Configuration File Configuring GDM to use VNCFirewall Settings VNC Screen ResolutionEnabling VNC for RHEL, CentOS, or OEL 6.x VMs Create the xinetd.d file, /etc/xinetd.d/vnc-server-streamSetting up SLES-based VMs for VNC Enabling Remote AdministrationModifying the xinetd Configuration Checking for a VNC ServerTo Open the VNC Port on Sles 10.x VMs Firewall Checking Runlevels To Open the VNC Port on Sles 11.x VMs FirewallAppendix E. Setting Up a Red Hat Installation Server Copying Installation MediaEnable Remote Access NFSFTP HttpAppendix F. Troubleshooting VM Problems To enable saving of Linux VM crash dumpsVM Crashes Controlling Linux VM Crashdump BehaviourTroubleshooting Boot Problems on Linux VMs