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Virtual Deep-Dive: Citrix Xen Server


Präsentation Virtual Deep-Dive von Stephan Pfister zum Thema Citrix, Xen Server

Präsentation Virtual Deep-Dive von Stephan Pfister zum Thema Citrix, Xen Server

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  • Hardware Layer:Contains the Physical server components, including memory, CPU, and Disk DrivesXenHypervisor:Is a thin Layer of Software that runs on top of the hardware.Control Domain:Manages the network and storage I/O of all virtual machines. (Is a Linux virtual machine)Guest operating System:Is the Operating System that is installed on the virtual machineLinux VM:include paravirtualized kernels and drivers.Windows VM:Use paravirtualized drivers to access storage and network recources.


  • 1. Architektur XenServer1
  • 2. XenServer Architectural Components2
  • 3. Architectural Changes The Open vSwitch is now the default network stackfor the product. Improvements to Distributed Virtual Switchinginclude a fail-safe option and various improvementsbased on customer feedback from XenServer 5.6Feature Pack 1. General network performance has beenimproved, particularly aggregate host networkthroughput. Support for hardware-assisted Single Route I/OVirtualization network performance optimizationshas been improved, particularly for use with theNetScaler VPX and SDX products. XenServer no longer requires Windows-based virtualmachines for features such as StorageLink, Site3
  • 4. XenServer Product Line XenServer is available in four editions to meet theneeds of any organization.4
  • 5. XenCenter Overview XenCenter:• is a graphical, Windows-based user interface.• allows you to manage XenServer hosts, resourcepools and shared storage, and to deploy, manageand monitor virtual machines from your Windowsdesktop machine.5
  • 6. Resource Pools XenServer allows you to manage multiple XenServerhosts as a single entity through the use of resourcepools. In the event of a host failure In preparation for upgrade a XenServer host To consolidate virtual machines to a select numberof XenServer hosts in order to reduce powerconsumption6
  • 7. Microsoft System Center Integration XenServer 6.0 supports System Center VirtualMachine Manager (SCVMM) 2012 for managingXenServer hosts and virtual machines. To enablethese management capabilities, install asupplemental pack from Citrix.7
  • 8. Live Storage XenMotion Extends standard XenMotion Migrates VM disks from any storage tystorage type Local, DAS, iSCSI, FC •Supports cross pool migration Requires compatible CPUs •Encrypted Migration model •Specify management interface for opt8
  • 9. XenServer Conversion Manager Convert VMware virtual machines to XenServer Convert multiple virtual machines in one simple wizard Map network settings between VMware and XenServer soyour converted virtual machines will come up with theproper network settings Choose the storage location where you would like yournew XenServer virtual machines to run9
  • 10. Netzwerk XenServer10
  • 11. XenServer Networking Overview You can configure four different virtual networks inXenServer: Single-Server Private networks, which are a type ofinternal network External networks Bonded networks, which are a type of externalnetwork Cross-Server Private networks, which are a type ofinternal network.(Cross-Server private networks will be discussed inthe Distributed Virtual Switching module.)11
  • 12. Network Stacks Supported by XenServer There are two networking stacks in XenServer 6.0: The Open vSwitch, the default networking stack The Linux bridge12
  • 13. Network Components and Architecture One network is created for each physical networkinterface card during XenServer installation. The XenServer host performs all the requiredconfigurations of the physical network interfacecards. When you add a XenServer host to a resourcepool, the default networks are merged so that allphysical NICs within the same device name areattached to the same network.13
  • 14. Bonding - Source Load Balancing SLB is an active/active mode which: Does not require switch support for EtherChannelor 802.3ad. Load-balances traffic between multiple physicalinterfaces at the MAC address level by sendingtraffic through different physical interfaces basedon the source MAC address of the packet. Is derived from the open source Adaptive LoadBalancing (ALB) mode and reuses the ALB capabilityto dynamically re-balance load across physicalinterfaces. SLB Active-passive bonds: Can be configured with one fast path, and one slowpath for cost savings. In this scenario, the slow pathshould be used only if there is a failure on the fast14
  • 15. Networking Enhancements in XenServer 6.1 LACP bonding support Support for up to 4 NICs per bond VLAN scalability improvements Port locking for cloud providers IPv6 guest support15
  • 16. Active-Active SLB vs. LACP All links can be activeregardless of traffic type Source MAC as well asIP/port based load balancing Requires 802.3ad standard onswitch Requires switch-sideconfiguration All links must be connectedto 1 switch/stack switches16 Can be used with any switch No requirement for stacking(6.1) Support up to 4 NICs Load balancing only ifmultipleMAC addresses are present