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Independent Management Architecture Internals

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Independent Management Architecture Internals

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    1. Independent Management Architecture Internals Kapil Ramlal Tim Card Global Escalation Team, Citrix Systems, Inc.

    2. Agenda

    3. Agenda

    4. What is the IMA Service? A collection of subsystems that control the various features of the Citrix Presentation Server (CPS) family of products Allows the use of the Presentation Server Console (PSC) or the Access Suite Console for centralized administration

    5. IMA Subsystems A subsystem is a DLL (*.dll) file. These make IMA modular so that new subsystems can be added or existing subsystems can be modified The subsystems interact via a messaging layer It routes data to the subsystems on the Presentation Servers in the farm These dynamics link libraries can be found in the following directory: C:\Program Files\Citrix\System32\Citrix\IMA\Subsystems

    6. Agenda

    7. Farm Data Static - Data Store (DS) Information that changes infrequently Published applications, load evaluators, Citrix administrators, Citrix policies etc. Local Host Cache (LHC) is a subset of data contained in the DS Located on every server Dynamic – Data Collector (DC) Information that changes frequently Sessions, disconnected sessions, load, etc. Responsible for resolutions

    8. IMA Data Structures Dynamic Data Located in tables which are stored in memory on the Data Collector (Dynamic Store). Can be viewed by using QueryDS.exe (not installed by default, located on the CPS media) Connected and Disconnected Sessions Server capabilities Published applications, servers online, servers offline, etc.

    9. IMA Data Structures Local Host Cache (LHC) An Access database located on every CPS server in the farm (\Program Files\Citrix\Independent Management Architecture\imalhc.mdb) A subset of the Data Store containing only information required by that server Allows the server to operate if the Data Store goes down Must exist and be accessible for the IMA Service to start

    10. IMA Data Structures LHC Troubleshooting DSMAINT VERIFYLHC [ /AUTOREPAIR ] DSMAINT RECREATELHC Must stop IMA service PSRequired set to 1 LHC is backed up - IMA.MDB.BAK DSMAINT COMPACTDB [/DS] [/LHC] LHCSizer – Counts number of records in LHC Enable Resolution Failure Event logging PSE400W2K3R02 HKLM\Software\Citrix\IMALogResolutionFailure LHC ODBC Event Logging PSE400W2K3R02 [#115579]

    11. IMA Data Structures Data Store Can be an Access, MSDE, SQL, Oracle, or DB2 database The Central Repository for static farm information such as: Number of servers Published applications Installed licenses (FR3 and below only) Citrix Administrators Installed Printers Load evaluators

    12. Starting the IMA Service

    13. IMA Components Review

    14. IMA Components Review

    15. Agenda

    16. IMA Case Studies Real World Examples

    17. IMA Service Fails to Start During Installation of Presentation Server Turn on MSI tracing (msiexec /i mps30.msi /l*v c:\msi.log) Start IMA service returned error in CTX_MF_IMA_StartIMAService Error = 1068 net helpmsg 1068 The dependency service or group failed to start Did all of the dependent services start? Resolution Enable The IPSec Services

    18. IMA Service Fails to Start During Installation of Presentation Server

    19. Troubleshooting “IMA hang” issues

    20. Troubleshooting with QueryDS.exe Case Study Users unable to connect to published applications Qfarm /load shows a zero load value Troubleshooting queryds /table:ServiceTable Name: 0 Host: XPSERVER Resolution Chfarm into an access datastore then rejoin the farm Review CTX103017 for more information

    21. Troubleshooting with QueryDS.exe

    22. IMA Query Timeout

    23. IMA Query Timeout Fix

    24. ‘Farm Data Key’ Case Study CPS server appears to be offline Presentation Server Console displaying inconsistent session information

    25. ‘Farm Data Key’ Case Study Troubleshooting Using Citrix DSView (included with the support tools on the Citrix Presentation Server Media), you can compare the “DATA” registry value on the CPS server to what’s in the Farm’s Data Store The “DATA” value on the server can be found at: HKLM\Software\Citrix\IMA\Data Name: DATA Type: REG_DWORD Data: Farm ID - Hex Value (Must add permissions to the “Data” registry key to see its values)

    26. ‘Farm Data Key’ Case Study Using Citrix DSView running on a CPS server, navigate to the following: “ServerNeighborhoods” ? FarmName[CLASS-ContextNode] ? subFarmName[CLASS-ContextNode] ? FarmData[CLASS-BaseClass] ? ATTRIBUTE-FarmData ? Hex Value identifying FarmData value

    27. ‘Farm Data Key’ Case Study Using Citrix DSView running on a CPS server, navigate to the following: “ServerNeighborhoods” ? FarmName[CLASS-ContextNode] ? subFarmName[CLASS-ContextNode] ? FarmData[CLASS-BaseClass] ? ATTRIBUTE-FarmData ? Hex Value identifying FarmData value

    28. ‘Farm Data Key’ Case Study Using Citrix DSView running on a CPS server, navigate to the following: “ServerNeighborhoods” ? FarmName[CLASS-ContextNode] ? subFarmName[CLASS-ContextNode] ? FarmData[CLASS-BaseClass] ? ATTRIBUTE-FarmData ? Hex Value identifying FarmData value

    29. ‘Farm Data Key’ Case Study Using Citrix DSView running on a CPS server, navigate to the following: “ServerNeighborhoods” ? FarmName[CLASS-ContextNode] ? subFarmName[CLASS-ContextNode] ? FarmData[CLASS-BaseClass] ? ATTRIBUTE-FarmData ? Hex Value identifying FarmData value

    30. ‘Farm Data Key’ Case Study Using Citrix DSView running on a CPS server, navigate to the following: “ServerNeighborhoods” ? FarmName[CLASS-ContextNode] ? subFarmName[CLASS-ContextNode] ? FarmData[CLASS-BaseClass] ? ATTRIBUTE-FarmData ? Hex Value identifying FarmData value

    31. ‘Farm Data Key’ Case Study Using Citrix DSView running on a CPS server, navigate to the following: “ServerNeighborhoods” ? FarmName[CLASS-ContextNode] ? subFarmName[CLASS-ContextNode] ? FarmData[CLASS-BaseClass] ? ATTRIBUTE-FarmData ? Hex Value identifying FarmData value

    32. ‘Farm Data Key’ Case Study Using Citrix DSView running on a CPS server, navigate to the following: “ServerNeighborhoods” ? FarmName[CLASS-ContextNode] ? subFarmName[CLASS-ContextNode] ? FarmData[CLASS-BaseClass] ? ATTRIBUTE-FarmData ? Hex Value identifying FarmData value

    33. ‘Farm Data Key’ Case Study Resolution Check the ‘FarmData’ value in the registry and ensure that it compares to the value in the Farm’s Data Store

    34. The “On-Ramp” Dilemma PROBLEM: Introducing a new server to the Farm, causes all incoming connections to the farm to be routed to it. Thus creating an “On-Ramp” condition, and eventually causing the server to become overloaded with sessions until no more connections are accepted. This creates a “Black Hole” symptom in the Farm Often seen during peak production hours

    35. The “On-Ramp” Dilemma TROUBLESHOOTING: Capturing Common Diagnostic Facility (CDF) tracing on the IMA subsystems responsible for ‘Load Management’, on the member servers and the Zone Data Collectors (ZDC) revealed the cause within the Load Management subsystem of IMA The Citrix Development Team introduced advanced ‘Load Management’ algorithms that better calculate the ‘Load Bias’ values and allows for tuning a “Slow Start Load Balancing” method

    36. The “On-Ramp” Dilemma Fix RESOLUTION: Slow-Start Load Balancing! This uses Intelligent Load Biasing Can be “Tuned” via the registry

    37. Gateway Validation Interval Case Study ISSUE: Gateway Validation Interval Registry Value Introduces Application Launch Failures in High Latency Environments Troubleshooting: Attempts to launch published applications fail with this error message:   Additionally, when Web Interface is used, a launch.html file may be returned instead of a launch.ica file (right-click and select “Save target as” on the application icon)

    38. Gateway Validation Interval Case Study TROUBLESHOOTING: Capturing CDF tracing on the zone data collectors, on the following IMA modules revealed the cause of the issue: MF_DLL_Wsxica MF_Service_CtxXmlSS IMA_Sals_MfServer IMA_Subsystems_Browser IMA_Subsystems_MfServer IMA_System_System IMA_Runtime_DynamicStore IMA_Runtime_ZoneManager IMA_Runtime_HostResolver IMA_Runtime_PersistentStore IMA_Runtime_Runtime IMA_System_Message

    39. Gateway Validation Interval Case Study RESOLUTION: Setting the GatewayValidationInterval to a lower value in high latency environments can cause a problem launching applications in remote zones. Citrix Technical Support does not recommend this registry value for high-latency environments.

    40. Agenda

    41. Introduction to Citrix MedEvac

    42. Introduction to Citrix MedEvac What is Citrix MedEvac? A Windows 32-bit Utility used to simulate the ICA client browsing requests to test XML,Terminal Services,IMA & RPC functionality Uses method of Isolation based on Citrix Presentation Server Farm architecture to isolate Farm functionality

    43. Introduction to Citrix MedEvac The Citrix MedEvac Utility can be used anytime where isolating a problem Server is difficult (with respect to load balancing, XML, Terminal Services and RPC) To troubleshoot connectivity issues with published resources, such as the mysterious ‘black hole’ issue To run direct health checks against Citrix Presentation Servers

    44. Introduction to Citrix MedEvac

    45. Introduction to Citrix MedEvac

    46. Demos

    47. Introduction to Citrix MedEvac It verifies the following: The XML service The IMA service The Termsrv Service The RPC service

    48. Open Forum

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