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Archive for the ‘MsClustering’ Category

Application Clustering – Config Build

Posted by Brajesh Panda on May 15, 2011

Before we start building any cluster we may like to use a cheat sheet which will help us to capture all inputs required to build an application cluster.

This list is for reference purpose. You can enhance this list as per your requirement. You can download this sheet from here.

Posted in MsClustering, MsFailOverClustering | Tagged: , | Leave a Comment »

Cluster Validation Error: An error occurred while executing the test. There was an error initializing the network tests. There was an error creating the server side agent (CPrepSrv). Creating an instance of the COM component with CLSID {E1568352-586D-43E

Posted by Brajesh Panda on May 8, 2011

While building failover cluster under one of my friend faced bellow error during validation phase.

An error occurred while executing the test. There was an error initializing the network tests. There was an error creating the server side agent (CPrepSrv). Creating an instance of the COM component with CLSID {E1568352-586D-43E4-933F-8E6DC4DE317A} from the IClassFactory failed due to the following error: 80070005

After some investigation & research on we found this error is applied to Windows 2008 Domain based networks.

Fix:

è Log On to Windows 2008 Domain Controller

è Open DCOMCONFG from start – run

è Expand Component Services -> Computer

è Right Click My Computer -> Select Default Properties Tab

è Under Impersonation Level Default Impersonate & Click Apply

è Reboot Domain Controller & Try Validation Again

Posted in MsClustering, MsFailOverClustering | Tagged: , | 2 Comments »

Best Practices for Exchange 2007 CCR Stretched Cluster

Posted by Brajesh Panda on March 8, 2010

In course of my SI Projects I found these are should be the best practices for a Exchange CCR Stretched Cluster. Let me know if anything I should include in my list.

Decision Making Factors

  • Is automated failover is required in unplanned site outage?
  • How frequently you are facing situation like complete site disaster?
  • Where is the major user base located? Is at Prod Site or DR Site?
  • Do we have enough bandwidth between these two sites?

     

AD Sites

  • Both CCR Hosts must be in same AD Site

    N.B:    Typically, Active Directory communication is controlled based on the AD Site design. Since both datacenters are using the same AD site, there is a risk that servers and clients in 1 datacenter may be communicating to domain controllers in the secondary datacenter. Cross authentication may leads slow response in Directory Server Access!

    –    Plan two domain controllers in each site

Network

  • Encase of Windows 2003 Server we have stretch the subnets across datacenters
  • Windows 2008 Stretch cluster can span across different subnets; however we have to consider below points;
    • Latency must not be more than 50ms
    • Two different subnets should be available for Cluster Private & Public Communication
    • Read the rest of this entry »

Posted in Clustering, Exchange2007, MsClustering, MsFailOverClustering | Tagged: , , , | 1 Comment »

Before you start installing SQL 2005 Cluster

Posted by Brajesh Panda on March 8, 2010

Here is some best practices you should aware of before you start installing Windows Cluster. I will be keep updating this list….. Let me know if I am missing something most important.

Applicable Product: Windows Cluster & SQL 2005

  • Make sure you have installed Advanced/Enterprise/Data Center Edition of Windows OS on all servers
  • Deployment User account is added to local admin groups
  • Deployment User account must have all Active Directory permissions to create Computer accounts for Virtual SQL Node
  • If you’re IT policy is preventing you to get computer account creation rights for deployment user account please go through KB articles how cluster computer accounts can be staged before you start installation
  • Verify Task Scheduler is running on all cluster nodes (For SQL Clustering)
  • Verify Windows Cryptographic Service is running on all cluster nodes (For SQL Clustering)
  • Verify NTLM Security Provider Service is running on all cluster nodes (For SQL Clustering)
  • Verify Remote Registry Service is running without any error on all cluster nodes (For SQL Clustering)
  • Verify you can access media location from other nodes by using UNC path (For SQL Clustering)
  • Apart from SQL Clustering you have to install software individually on all other nodes. Hence make sure all media you are using are of same version & cluster aware.
  1. SQL Clustering use Task Scheduler to install the SQL software on all nodes at the same time.
  2. Apart from SQL Standard Edition, you need Enterprise Edition software for Clustering. SQL Standard edition support only 2 Node clusters
  • Make sure you have the right software media
  • Better to keep handy SMSTrace tool to verify Installation logs encase of any problem
  • File Systems must be formatted as NTFS. Read the rest of this entry »

Posted in Clustering, MsClustering, MsFailOverClustering | Tagged: , | Leave a Comment »

 
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