XenDesktop Design and ArchitectureJamie Baker Sr. Escalation Engineer

AgendaXenDesktop Architecture Review Pool Management USB Redirection Troubleshooting Tools and Techniques

XenDesktop Architecture

Inter-DDC Communication Independent Management Architecture Similar to the role IMA takes in XenApp Central Data Store Zone Data Collector handles Dynamic Store Limited to one zone

Inter-DDC communication Farm Management

PC

Session Management

Virtual Machine Registration On the Virtual Desktop Agent Machine Citrix Desktop Service

On the Desktop Delivery Controller Citrix Desktop Delivery Service Independent Management Architecture

Virtual Machine Registration

Enumeration and Connection Citrix XML Service IMA Service Desktop Delivery Service Citrix ICA Service Citrix CGP Service

User Authentication and Pool Resolution

Desktop Connection

Pool Management

Services Involved Citrix Pool Management Service Hosting Infrastructure XenServer Pool Master Vmware Virtual Center MS SCVMM Virtual Machines

Pool Management Service

Pool Master

Pool Management

Virtual Machines

Desktop Delivery Controller Pool Management Service

Pool Master

Addresses=[http://10.54.76.172,http://10.54.76.173][http://10.7.1.21,http://10.7.1.22]

Virtual Machines

Pool ManagementPool Master

Desktop Delivery Controller Pool Management Service

Virtual Machines

Pool Master

Virtual Machines

Desktop Delivery Controller Pool Management Service

Pool Master

USB Redirection

Device information Identifying a device Descriptors String, Device, Configuration, Interface, Endpoint & more

Device/interface classes & subclasses Mass storage, Image, etc.

Modified components Modified components Policy Presentation Server console, IMA, DDC, PortICA configuration defaults

PortICA configuration schema PortICA service Workstation Agent

Desktop Toolbar

New components New components Citrix USB Service Protocol handling, Policy lookup and enforcement

Citrix USB bus driver Presents devices to system

ctxusbf.sys USB filter driver Filter on all USB devices

ctxusbr.sys USB redirection driver Dummy device driver for redirected devices

vdgusbN.dll USB virtual channel

Endpoint / VDA relationshipBefore Redirection / Not RedirectedDesktop Receiver(client)

Once RedirectedVirtual Desktop Agent(PortICA)

Apps

Apps

Standard Drivers

USB Redirection Manager

ICA Client

PortICA stack

USB Service

Standard Drivers

Interception driver (pass through)

Interception driver

MS USBHUB

MS USBHUB

Citrix USB bus driver

Device

Device

User mode components Workstation Agent Policy handling Read from GPO registry keys

PortICA configuration Written into configuration sent to ICA service

Citrix USB Service Policy reading (from configuration) Policy enforcement Data pump

Kernel mode components Citrix USB bus driver Control device communication with USB Service Device stack Handles IOCTLs from function drivers Certain interface requests (e.g. USB_BUS_INTERFACE_USBDI_V0)

Desktop Receiver ctxusbf.sys USB filter driver Upper class filter on USB hubs Lower filter on device stacks Reads policy from registry: HKLM\Citrix\ICA Client\GenericUSB\DeviceRules HKLM\Policies\Citrix\ICA Client\GenericUSB\DeviceRules

Changes VID & PID on-the-fly

Desktop Receiver ctxusbr.sys USB redirection driver Dummy device driver Command pump for Host-to-Client commands Sends responses back to client Handles asynchronous URBs

vdgusbN.dll USB virtual channel Communicates with toolbar Data pump to/from server/client

Troubleshooting Tools and Tips

VDA registration issues XDPing tool Services on the DDC Networking DNS

Desktop Service Logging CTX117452

CDFControl

Pool Management Failures Logging in Pool Management Service CTX117452

XenServer logs CDF Tracing XDPing tool

Desktop Connectivity Failures CDF tracing Event Logs on VDA Standard IMA resolution troubleshooting Standard ICA connection troubleshooting Network tracing XDPing

Case Study - User Association with a VDA is Lost Username shows as "-" in AMC User cannot reconnect to session once disconnected User token is captured by ctxidhlpr.exe on session start Token is not cached Restart of the Desktop Service loses the token

Case Study - User Association with a VDA is Lost The desktop service does not get user token on re-launch Reassociate the token by running ctxidhlpr.exe in the user session

Do Not Restart the VDA Desktop Service without reason!

Case Study Pool Management Churn Idle pool spins up several VDAs Registration does not take place in 3 minutes Pool Manager Starts up more VDAs Eventually all register Pool Manager shuts down extra VDAs

Case Study - Pool Management Churn Pool Management Logs Desktop Service Logs Performance Logs from Hosting Infrastructure XDPing test to FQDN of the VDA

Correctly Size Your Hosting Infrastructure during transitional periods!

Recap XenDesktop Architecture is similar to XenApp Architecture XenDesktop 3.0 provides: XenServer Pool Master failover USB device redirection

Use plaintext logging and XDPing for troubleshooting

Questions??

Continue Your LearningThe following course expands on today's topics and is recommended to support your Citrix solution: CXD-200 Implementing Citrix XenDesktop 3

Visit www.citrixeducation.com for more information

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