Host Aggregates page in the OpenStack view

Host Aggregate is an OpenStack entity. You can partition a single Compute deployment into logical groups; for example, into multiple groups of hosts that share common resources like storage and network, or have a special property such as trusted computing hardware.

The Host Aggregates page in the OpenStack view displays information for all the host aggregates available in the selected cloud.  

You can access this page in the TrueSight console using one of the following ways:

  • Select Capacity > Views > Cloud > OpenStack and click the Host Aggregates tab
  • In the OpenStack > Cloud page, navigate to the Related Information panel and click the Host Aggregates link.

The following figure shows the Host Aggregates view page displaying the host aggregate related information.

An example of OpenStack Host Aggregates tab 

For more information, see:

Viewing the OpenStack Host Aggregates table

The Host Aggregates table lists the following information for each host aggregate in the selected cloud. By default, some columns are hidden. You can show or hide columns using the action menuthat is located next to the Host Aggregates table title. For more information, see Sorting a table in the TrueSight console.

Host Aggregates table: Description of columns

ColumnDescriptionStatistical Type Metrics 

Name of the host aggregate. Clicking on one of the hosts in this column of the summary view takes you to the host aggregate details view.

Last Value NAME
Availability ZoneName of the Availability Zone that contains this host aggregate. Last Value Relationship AZ_CONTAINS_HY is used to get the NAME of the availability zone
CPU [GHz]Total CPU capacity available of the host aggregate, measured in GHz.Last ValueTOTAL_CPU_MHZ
CPU Used [GHz]Total CPU used by the host aggregate, measured in GHz.95th percentile


CPU Util [%]Percentage of total CPU utilized by the host aggregate.95th percentileCPU_UTIL
CPU Trend [%]The daily growth rate of CPU utilization of the host aggregate.TrendTrendbased on CPU_UTIL
Memory [GB]Total physical memory capacity of the host aggregate, measured in GB.Last valueTOTAL_REAL_MEM
Memory Used [GB]Total physical memory used by the host aggregate, measured in GB.95th percentile


Memory Util [%]Percentage of total physical memory utilized by the host aggregate.95th percentile MEM_UTIL
Memory Trend [%]Daily growth rate of memory utilization of the host aggregate.TrendTrendbased on MEM_UTIL
Ephemeral Storage Size [GB] Total capacity of ephemeral storage, measured in GB.Last valueTOTAL_EPHEMERAL_DISK_SIZE
Ephemeral Provisioned Storage [GB] Total ephemeral storage provisioned to the virtual machines in OpenStack measured in GB.95th percentileTOTAL_EPHEMERAL_DISK_PROVISIONED
Datastore [GB]Total capacity of the datastore, measured in GB.Last valueTOTAL_DSTORE_SIZE
Datastore Used [GB]Total used space in the datastore, measured in GB.95th percentile


DatastoreUtil[%]Percentage of total datastore capacity used by the host aggregate.95th percentile 


Datastore Trend [%]Daily growth rate of datastore utilization of the host aggregate.TrendTrendbased on DSTORE_UTIL
CPU Overcommit Ratio

Ratio of vCPUs allocated to the virtual machines to total physical CPUs available in the hypervisors in the host aggregate

Computed based on last values VCPU_ON_NUM, CPU_NUM 
Memory Overcommit Ratio

Ratio of memory allocated to the VMs to the total physical memory available in the hypervisors in the host aggregate.

Computed based on last valuesSUM (VM.TOTAL_REAL_MEM), TOTAL_REAL_MEM 
Ephemeral Storage Overcommit Ratio Ratio of ephemeral storage provisioned to the total capacity of ephemeral storage.Computed metricTOTAL_EPHEMERAL_DISK_SIZE, TOTAL_EPHEMERAL_DISK_PROVISIONED
Hypervisor CountThe number of hypervisors on the host aggregate.Last valueHOST_NUM
Powered On VMsNumber of virtual machines that are powered on.95th percentile GM_ON_NUM
Spare VMsEstimated number of additional virtual machines that can be placed in the host aggregate, calculated based on the remaining CPU, Memory and Storage capacity. For more information, see Spare VM calculation in Recalculating the spare VM basis.Computed by AFS using total capacity and 95th utilization of CPU, Memory and Storage   IND_SPARE_VM
Spare VM Basis

Custom or Typical is displayed. An average VM for cluster based on the past 30 days is used for Typical, whereas Custom indicates that custom VM data (Average utilization of CPU, Memory, and Datastore ) is specified. To edit the value that has been set, click the value displayed in this column.

For more information, see Spare VM calculation in !in Recalculating the spare VM basis.

Days to Saturation

The projected amount of time before one of the resources (CPU, MEMORY, STORAGE) in the host aggregate runs out of available capacity.

Displays the number of days to saturation for the least available resource.

Computed by AFS using total capacity and 95th utilization of CPU, Memory and Storage 


Bottleneck ResourceName of the resource that has either saturated or will saturate in the next 30 days. Bottleneck resource can be CPU, MEMORY or STORAGE. The field is blank if none of the resources has saturated, or will saturate.Computed by AFS using total capacity and 95th utilization of CPU, Memory and StorageIND_BNECK_RESOURCE

For more information on the Days to Saturation and other indicator parameters used for metric computations in this view, see Indicators.

Viewing detailed information about a Host Aggregate

After you click on the host aggregate in the Name column, the details for that host aggregate are displayed in the Host Aggregate Details page: 

Host Aggregate Details table

Section or PanelDescription
General details section

General details, such as host aggregate name, type, and a number of elements within it are displayed.

Related Information panel

 Clicking the links in the Related Information panel displays the other information related to the selected host aggregate

    • Thresholds: Clicking on the link cross-launches to the Capacity Optimization console and take you to the Thresholds page for the selected host aggregate. For more information, see Adding and viewing thresholds

Tags panelDisplays tags, if any, that are associated with the host aggregate. You can add tags to the host aggregate using the action menuthat is located next to Tags. For more information, see Working with tag filters.
Summary tab

The Summary tab, that is displayed by default, displays details for the selected host aggregate in a horizontal summary table, as well as charts. 

Analysis charts: Core metrics for the selected entity are displayed as analysis charts, depending on available data. A link at the bottom of each chart allows you to view the data for a specific resource type. You can download, save an offline copy, annotate, and print the charts. For more information, see Managing charts.

Configuration Details tabThe Configuration Details tab displays the configuration matrix for the selected host aggregate

An example of the Host Aggregate Details page

Using data filters and other controls in tables

You can sort and filter the information that is displayed in tables to suit your need. For instance, you can show or hide columns, export the data to Excel, select a different cloud and region, clear the selected cloud and region, and so on.

For more information, see Sorting a table in the TrueSight console and Using filtering options in views in the TrueSight console.

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