6.0.1
Table Of Contents
- vSphere Availability
- Contents
- About vSphere Availability
- Updated Information
- Business Continuity and Minimizing Downtime
- Creating and Using vSphere HA Clusters
- Providing Fault Tolerance for Virtual Machines
- Index
Advanced Runtime Info
When you select the Host Failures Cluster Tolerates admission control policy, the Advanced Runtime Info
pane appears in the vSphere HA section of the cluster's Monitor tab in the vSphere Web Client. This pane
displays the following information about the cluster:
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Slot size.
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Total slots in cluster. The sum of the slots supported by the good hosts in the cluster.
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Used slots. The number of slots assigned to powered-on virtual machines. It can be more than the
number of powered-on virtual machines if you have defined an upper bound for the slot size using the
advanced options. This is because some virtual machines can take up multiple slots.
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Available slots. The number of slots available to power on additional virtual machines in the cluster.
vSphere HA reserves the required number of slots for failover. The remaining slots are available to
power on new virtual machines.
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Failover slots. The total number of slots not counting the used slots or the available slots.
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Total number of powered on virtual machines in cluster.
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Total number of hosts in cluster.
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Total good hosts in cluster. The number of hosts that are connected, not in maintenance mode, and have
no vSphere HA errors.
Example: Admission Control Using Host Failures Cluster Tolerates Policy
The way that slot size is calculated and used with this admission control policy is shown in an example.
Make the following assumptions about a cluster:
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The cluster is comprised of three hosts, each with a different amount of available CPU and memory
resources. The first host (H1) has 9GHz of available CPU resources and 9GB of available memory, while
Host 2 (H2) has 9GHz and 6GB and Host 3 (H3) has 6GHz and 6GB.
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There are five powered-on virtual machines in the cluster with differing CPU and memory
requirements. VM1 needs 2GHz of CPU resources and 1GB of memory, while VM2 needs 2GHz and
1GB, VM3 needs 1GHz and 2GB, VM4 needs 1GHz and 1GB, and VM5 needs 1GHz and 1GB.
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The Host Failures Cluster Tolerates is set to one.
Chapter 2 Creating and Using vSphere HA Clusters
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