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Windows 2008 FailOver Cluster

Posted on 2012-09-04
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Dear Team,

                Having a doubt while configuring fail over clustering in Node majority, Node and Disk majority,Node and file share majority and No Majority Disk only. Can any one briefly explain the difference of these quorum models.
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Question by:columbuseng
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by:Krzysztof Pytko
ID: 38362661
I would recommend reading these Microsoft articles first

Understanding quorum disks in clustering
http://technet.microsoft.com/en-us/library/cc770620%28v=ws.10%29.aspx
http://technet.microsoft.com/en-us/library/cc731739.aspx

File Share majority
http://technet.microsoft.com/en-us/library/bb676490%28v=exchg.80%29.aspx

Regards,
Krzysztof
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by:columbuseng
ID: 38362984
Hi Krzysztof,

                         I am having a doubt in Quorum and Witness disk. Quorum is said to be "the quorum for a cluster is the number of elements that must be online for that cluster to continue running"  and Witness disk contains the configuration files of the cluster including quorum. In a scenario  5 node cluster , LUN should be mapped to all the five node for the node to participate in Clusters. So the LUN is the common shared location for all the five node for configuring cluster. In this scenario which one is Witness disk and quorum..
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by:Krzysztof Pytko
ID: 38363003
Witness disk in 2008 or quorum disk on 2003 is a cluster configuration disk (usually small 512MB - 1 GB) which stores information about cluster configuration. It is hold on one node only at the time. When node would fail, it is moved to another node to re-read cluster configuration and provide resource high availability.

You need to present that disk to each node within a cluster

Krzysztof
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by:columbuseng
ID: 38363034
Hi Krzysztof,

                                 As you said that the cluster configuration details which is a witness disk will available on only one node at the time. Whether this witness disk will be shared storage (for eg LUN) or local storage (local hard disk of the node ) .
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by:Krzysztof Pytko
ID: 38363040
it should be on LUN (SAN, iSCSI) this should be always available resource and cannot be stored on local drive

Krzysztof
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by:columbuseng
ID: 38363068
Hi Krzysztof,
                      I am bit confused with shared disk too in this clustering. I will tell one scenario if u explain according to that scenario i will be  clear in clustering. In Two node clustering(Node and Disk Majority) , While configuring a cluster it require a shared storage
space for Disk wintess. Then only it will pass the cluster validation wizard. So I have created a LUN named "A" and mapped to both the nodes 1 and 2.  SO the both the nodes will contains the LUN named A . In this LUN "A"( 1GB) are configured as Witness
disk ("which contains quorum configuration")  So the quorum configuration will available to two nodes. As u said, the witness disk will be available to node 1 and when node 1 fails will pass to node 2. How its possible in this scenario??  Whether i had did any mistake while configuring LUN.. Or else i have create two LUN's of same size (1GB) and have to map LUN A to node 1 and LUN B to node 2. Please clarify it.
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Krzysztof Pytko earned 1500 total points
ID: 38363077
No, this is done properly. As you already know, cluster cannot work out of Active Directory environment. Cluster configuration is stored on quorum disk. Each cluster node knows how many nodes are in cluster configuration (registry settings too)

When one node will discover that another is unavailable then it request to be an owner of resources defined in quorum. Quorum is available to both nodes which is advertised during cluster configuration. As you can see in Disk Management on each node that drive is visible by both nodes. But only one has it active with drive letter

You don't need to create new LUN for node B :)

Krzysztof
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Expert Comment

by:Krzysztof Pytko
ID: 38363080
However, if you wish, we may follow a test lab using Microsoft iSCSI Initiator to learn a little bit more about clustering :)
It's free and we can use that in test environment
http://www.microsoft.com/en-us/download/details.aspx?id=19867

Krzysztof
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