1484241150 by Unknown

Author:Unknown
Language: eng
Format: epub
Published: 2018-10-30T04:55:57+00:00

CHAPTer 10 ProVidiNg HigH AVAiLABiLiTy for HyPer-V VirTuAL MACHiNeS

Each node in the cluster gets a single vote toward the quorum, but many clusters

only contain two nodes. A witness is needed to provide an odd number of total votes,

meaning that a quorum can be established. The witness can be

• Disk: A specific volume is designated as the witness. The witness

disk must be on external storage and can be small (512MB

minimum)—1GB is more than sufficient. This is most useful

for clusters with non-replicated storage.

• File share: An SMB share (5MB minimum free space). The file server

should be on a different site from the cluster nodes. The cluster

information is held in a witness.log file, rather than a copy of the

cluster database. This is most suitable for multisite clusters with

storage replication.

• Cloud: Azure Blob (Binary Large Object) storage is used to host a

read/write file that acts as the witness. Only available in Windows

Server 2016 and later versions, this option is best suited to multisite

clusters.

ABOVE AND BEYOND

More information on the witness and workings of the cluster quorum can be found at

https://technet.microsoft.com/en-us/library/jj612870(v=ws.11).aspx.

The use of a cloud-based witness for Windows Server 2016–based clusters is described here:

https://docs.microsoft.com/en-us/windows-server/failover-clustering/

deploy-cloud-witness.

If you have an odd number of nodes in the cluster, you can configure the cluster to

work on a node-majority basis. In this case, only the cluster nodes have a vote in the

quorum, and a witness isn’t required.

Cluster Storage

As stated, each node in the cluster requires dedicated storage for its OS. In addition, the

nodes need access to external storage that supports the workloads hosted on the cluster.

There are a number of options available for cluster storage.

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