Dell AX4-5 - Manual (Page 33)

Preparing Your Systems for Clustering
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3 Node Majority: The cluster nodes determine the maximum number of
failures that the cluster can sustain (similar to the Majority Node Set
feature in the Windows Server 2003 operating system). A Node Majority
Cluster can sustain the failure of one node less than half the total number
of nodes rounded up in the cluster.
4 No Majority - Disk only: This model cannot sustain the failure of the
quorum disk (similar to the Shared Disk Quorum feature in the Windows
Server 2003 operating system), which becomes a single point of failure,
and is therefore not recommended.
NOTE:
It is recommended that you use Node and Disk Majority option for quorum
configurations.
NOTE:
If your cluster setup has odd number of nodes while creating the Failover
Cluster then WSFC uses Node Majority quorum model. You can manually change
the quorum model to Node and Disk Majority.
Creating a LUN for the Witness Disk for Node and Disk Majority and No
Majority Models
NOTE:
It is recommended that you create a separate LUN of 512 MB (approximately)
for the witness disk for the Node and Disk Majority and No Majority quorum models.
The witness disk in these models has a copy of the cluster configuration.
When you create the LUN for the witness disk on the shared storage ensure
that you have:
• Formatted the LUN with NTFS.
• Used the LUN exclusively for the Cluster logs.
• Not stored any application data or user data on the witness disk.
NOTE:
It is recommended that you use a RAID level other than RAID 0, which is
commonly called striping. RAID 0 configurations provide very high performance, but
they do not provide the level of availability required for the witness disk.
Configuring a Service or Application for High Availability
Failover Clustering in Windows Server 2008 allows you to configure a service
or an application for high availability by running the Configure a Service or
Application for High Availability wizard. To configure a highly-available
service or application: