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.
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
XenServer Product Line XenServer is available in four editions to meet theneeds of any organization.4
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
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
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
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
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
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
Network Stacks Supported by XenServer There are two networking stacks in XenServer 6.0: The Open vSwitch, the default networking stack The Linux bridge12
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
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
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
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
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