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Category Archives: HA Clustering

Create SQL Server HA and DR using FCI and AOAG

One of the most tricky subject for any SQL Server DBA or SQL server consultant How to build HA ( High Availability ) it is not something Complex, but it need to be list down all of the points and the requirements before going for this project and when we talk about High Availability We should consider two technology FCI (SQL Server Failover Cluster) and AOAG (Always on High Availability Group) both technologies will give you the same feature ( High Availability ) to save your DB from any disaster  can be happened in your DB center , As you know AOAG is new technology released with SQL Server 2012 and Microsoft added more features on it in SQL Server 2016, 2017 and 2019 as well . So really I recommend it for HA solution. Also, it will give you the availability to split your transaction between multiple instance one as RW (Read-write) it is called Primary, and the other instance will work as R (Read only), and it is called secondary server.

Now I leave you with the training video to know How you can build SQL Server HA and DR using FCI and AOAG


Training video published by Mr. Musab Umair  Microsoft SQL Server DB Consultant you can follow him on his LinkedIn account (https://www.linkedin.com/in/musabumair/)

Keep following our community to know all of the new technologies and features in SQL Server

 
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Posted by on November 6, 2018 in HA Clustering

 

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Cluster Firewall issue – An item with the same key has already been added

Problem :

When I Prepare the Test Environment to the SQL Server Clustering  Under Windows Server 2008R2 Clustering I get this issue :

Clutser validation Error

After I Create the Cluster must be make validate the Configuration when I check this Configuration I get this issue Validate Windows Firewall Configuration in the detail of the error An item with the same key has already been added

Reason of the problem :

This is typically because the NIC GUID is duplicated between cluster nodes. When I won’t to create 3 Virtual machine (Cluster-PC , Node 1 , Node 2 )

I Create the First Virtual machine and take it Twice copy this is the issue because when I make Copy the Node 1 and Node 2 Created with the same Physical Address (MAC IP) so the Conflict in this area

the first solution came to my brain it’s I will Format Node 1 and I will install it from the first (Windows) but I Check more time to another Solution and I defected good Solution by Asking my friend System Administrator Eng.Hamada Abdelkader

Solution :

1- open the Run

2- Write this Command (sysprep)

3- Enter

this Command is System preparation it will male  preparation to the network after this Command finish I Check the mac IP very good new Address and I run the Validate Configuration for the Windows Cluster again and it successful 100%

Thanks For Eng.Hamada Abdelkader

Regards,

Eng.Mostafa Elmasry

Database Administrator

 
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Posted by on March 15, 2013 in HA Clustering