Protronics
Contributor
Contributor

Can you have a cluster with a single host?

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Hi

I'm setting up a new VMware infrastructure which includes a cluster with 2 hosts in one location and a single ESX host in a second location.  They'll all be managed by a single vSphere server.

There's the potential that the second site may gain an extra ESX host at some point in the future.  My question, therefore, is whether I should create a cluster for the second site and just have the single host in it for now, so its ready if we add a second host?  Is it possible to have a cluster with just one host, and what are the implications of this?

Thanks

Joe

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TomHowarth
Leadership
Leadership

Technically yes you can have a Cluster of a single node and if you are thinking of adding another node into the cluster later on it makes sense to set the first node up.

This both from a technical standpoint, but more importantly a BAU point of view.  The promotion to mulitnode cluster will be less intrusuve as there will be no extra software to add to the pre-existing primary node, therefore you Change Board will be less nervous about the peice of work, as it will not be changing the pre-existant node.

From a personal point of view my current client is running a number of single node clusters, in their environment.

Tom Howarth VCP / VCAP / vExpert
VMware Communities User Moderator
Blog: http://www.planetvm.net
Contributing author on VMware vSphere and Virtual Infrastructure Security: Securing ESX and the Virtual Environment
Contributing author on VCP VMware Certified Professional on VSphere 4 Study Guide: Exam VCP-410

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I cant see it being any extra effort / problem to create the additinal cluster , so I'd let it be a cluster of 1 for now. its something I've dont in the windows side of things before , and is generally al ot easier to add an additional node to a single node cluster than it is to turn a standalone machine into a cluster.

If this post has been useful , please consider awarding points. @chrisdearden http://jfvi.co.uk http://vsoup.net
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rManic
Expert
Expert

At the moment ther is no use for cluster as it only one host .but in future it may help. it is a good practise to have host under cluster if more then one host.

Regards Manic
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TomHowarth
Leadership
Leadership

Technically yes you can have a Cluster of a single node and if you are thinking of adding another node into the cluster later on it makes sense to set the first node up.

This both from a technical standpoint, but more importantly a BAU point of view.  The promotion to mulitnode cluster will be less intrusuve as there will be no extra software to add to the pre-existing primary node, therefore you Change Board will be less nervous about the peice of work, as it will not be changing the pre-existant node.

From a personal point of view my current client is running a number of single node clusters, in their environment.

Tom Howarth VCP / VCAP / vExpert
VMware Communities User Moderator
Blog: http://www.planetvm.net
Contributing author on VMware vSphere and Virtual Infrastructure Security: Securing ESX and the Virtual Environment
Contributing author on VCP VMware Certified Professional on VSphere 4 Study Guide: Exam VCP-410
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Tigerstolly
Enthusiast
Enthusiast

Yep we have single node clusters in DR, so that the resource pools mirror what we have in prod.  I don't think you can have resource pools without clusters.

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Protronics
Contributor
Contributor

Thanks for all the responses - good to know I wasn't being totally mad!  I've gone ahead and created the second cluster for th single server.

Joe

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