A. You can use the cluster.exe command to change a cluster’s quorum mode. To view the existing quorum mode for a cluster, you use the following command (in the format cluster cluster name /quorum), as follows:

C:\>cluster savdalclusfs01 /quorum

You’ll get this output:

Witness Resource Name Path Type
(Node Majority) Majority  

To change the quorum mode, you add a resource for the type of quorum mode you want—for example, a file-share witness—as follows. (Both the commands you enter and their output are shown.)

C:\>cluster /cluster:savdalclusfs01 res "File Share Witness" /create /group:"Cluster Group" /type:"File

Share Witness" /priv SharePath=\\savdaldc02\fsw

Creating resource 'File Share Witness'...

Resource Group Node Status
File Share Witness Cluster Group savdalclus01 Offline
C:\>cluster /cluster:savdalclusfs01 res "File Share Witness" /online

Bringing resource 'File Share Witness' online...

Resource Group Node Status
File Share Witness Cluster Group savdalclus01 Online
C:\>cluster savdalclusfs01 /quorum:"File Share Witness"
Witness Resource Name Path Type
File Share Witness Majority  

Notice we add the file share as a resource, bring the new resource online, then tell the cluster to use that resource for the quorum. Unlike the procedure for changing the cluster quorum via the Microsoft Management Console (MMC) Failover Cluster Management snap-in, you must give the cluster computer object, and not the administrator, full control on the share. That is, for my cluster I must add account savdalclusfs01$ with full control to the share fsw on server savdaldc02.

To change quorum to a disk witness, you need to move a disk resource into the cluster group, like this:

C:\>cluster res "Quorum Disk" /move:"Cluster Group"

Moving resource 'Quorum Disk' to group 'Cluster Group'...

Resource Group Node Status
Quorum Disk Cluster Group savdalclus01 Online

Now you need to tell the cluster to use the disk for the quorum:

C:\>cluster /quorum:"Quorum Disk"
Witness Resource Name Path Type
Quorum Disk F:\Cluster\ Majority

Note that if you add /disk to the end of the command, you tell the cluster to use disk only and not Node and Disk Majority (the normal mode).

C:\>cluster /quorum:"Quorum Disk" /disk
Quorum Resource Name Path Type
Quorum Disk F:\Cluster\ No Majority--Disk Only
-

You can switch to Node Majority only by running the following command:

C:\>cluster /quorum /node
Witness Resource Name Path Type
(Node Majority)   Majority

The screencast below takes you through using the command line to perform this and other Server 2008 cluster-configuration tasks.