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Set-SCVMHostCluster

Updated: September 27, 2012

Applies To: System Center 2012 - Virtual Machine Manager

Set-SCVMHostCluster

Modifies the properties of a virtual machine host cluster managed by VMM.

Syntax

Parameter Set: Default
Set-SCVMHostCluster [-VMHostCluster] <HostCluster> [-ClusterReserve <UInt32> ] [-Description <String> ] [-JobGroup <Guid> ] [-JobVariable <String> ] [-PROTipID <Guid> ] [-RunAsynchronously] [-SetQuorumDisk <ClientObject> ] [-SetQuorumNodeMajority] [ <CommonParameters>]




Detailed Description

Modifies the properties of a host cluster managed by System Center Virtual Machine Manager (VMM). Properties that you can modify include changing the cluster reserve setting.

CLUSTER RESERVE

--------------------

The cluster reserve setting specifies the number of host failures that a host cluster can sustain before VMM considers the cluster to be over-committed. An over-committed host cluster is one that cannot withstand the specified number of host failures and still keep all of the virtual machines in the cluster running.

Virtual Machine Manager uses the following processes to determine over-commitment:

- Host Placement. The placement process calculates whether adding a new

virtual machine to the host cluster will over-commit the host cluster

and, if so, placement stops recommending the deployment of additional

virtual machines on hosts in that cluster.

- Cluster Refresher. The host cluster refresher calculates, at periodic

intervals, whether a host cluster is over-committed or not based on the

following events:

- A change in the value specified for the ClusterReserve parameter.

- The failure or removal of nodes from the host cluster.

- The addition of nodes to the host cluster.

- The discovery of new virtual machines on nodes in the host cluster.

The following examples illustrate how over-commitment works:

- Example of over-commitment when all nodes are functioning:

If you specify a cluster reserve of 2 for an 8-node host cluster,

and all 8 nodes are functioning, the host cluster is over-committed if

any combination of 6 (8 minus 2) nodes lacks the capacity to accommodate

existing virtual machines.

- Example of over-commitment when some nodes are not functioning:

If you specify a cluster reserve of 2 for an 8-node host cluster,

but only 5 nodes are functioning, the host cluster is over-committed if

any combination of 3 (5 minus 2) nodes lacks the capacity to accommodate

existing virtual machines.

For more information about Set-SCVMHostCluster, type: "Get-Help Set-SCVMHostCluster -online".

Parameters

-ClusterReserve<UInt32>

Specifies the number of host failures that a host cluster can sustain before VMM designates the cluster as over-committed. The default value is 1.


Aliases

none

Required?

false

Position?

named

Default Value

none

Accept Pipeline Input?

false

Accept Wildcard Characters?

false

-Description<String>

States a description for the specified object.


Aliases

none

Required?

false

Position?

named

Default Value

none

Accept Pipeline Input?

false

Accept Wildcard Characters?

false

-JobGroup<Guid>

Specifies an identifier for a series of commands that will run as a set just before the final command that includes the same job group identifier runs.


Aliases

none

Required?

false

Position?

named

Default Value

none

Accept Pipeline Input?

false

Accept Wildcard Characters?

false

-JobVariable<String>

Specifies that job progress is tracked and stored in the variable named by this parameter.


Aliases

none

Required?

false

Position?

named

Default Value

none

Accept Pipeline Input?

false

Accept Wildcard Characters?

false

-PROTipID<Guid>

Specifies the ID of the PRO tip that triggered this action. This allows for auditing of PRO tips.


Aliases

none

Required?

false

Position?

named

Default Value

none

Accept Pipeline Input?

false

Accept Wildcard Characters?

false

-RunAsynchronously

Indicates that the job runs asynchronously so that control returns to the command shell immediately.


Aliases

none

Required?

false

Position?

named

Default Value

none

Accept Pipeline Input?

false

Accept Wildcard Characters?

false

-SetQuorumDisk<ClientObject>

Specifies a disk to use as the quorum disk for the cluster.


Aliases

none

Required?

false

Position?

named

Default Value

none

Accept Pipeline Input?

false

Accept Wildcard Characters?

false

-SetQuorumNodeMajority

Sets the quorum mode to Node Majority for the cluster.


Aliases

none

Required?

false

Position?

named

Default Value

none

Accept Pipeline Input?

false

Accept Wildcard Characters?

false

-VMHostCluster<HostCluster>

Specifies a VMM host cluster object.


Aliases

none

Required?

true

Position?

1

Default Value

none

Accept Pipeline Input?

true (ByValue)

Accept Wildcard Characters?

false

<CommonParameters>

This cmdlet supports the common parameters: -Verbose, -Debug, -ErrorAction, -ErrorVariable, -OutBuffer, and -OutVariable. For more information, see about_CommonParameters.

Inputs

The input type is the type of the objects that you can pipe to the cmdlet.

Outputs

The output type is the type of the objects that the cmdlet emits.

  • VMHostCluster

Examples

1: Change the setting for the cluster reserve for a host cluster.

The first commandgets the host cluster object named VMHostCluster01.Contoso.com and stores the object in the $VMHostCluster variable.

The second command changes value for the cluster reserve for host cluster VMHostCluster01 to 2.


PS C:\> $VMHostCluster = Get-SCVMHostCluster -Name "VMHostCluster01.Contoso.com"PS C:\> Set-SCVMHostCluster -VMHostCluster $VMHostCluster -ClusterReserve 2

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