Availability Zones page in the OpenStack view

Availability Zones are defined to aid fault tolerance. This enables you to arrange OpenStack compute hosts into logical groups and provides a form of physical isolation and redundancy from other availability zones, such as by using a separate power supply or network equipment.

The Availability Zones page in the OpenStack view displays information for all availability zones for 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 Availability Zones tab
  • In the OpenStack > Cloud page, navigate to the Related Information panel and click the Availability Zones link.

The following figure shows the Availability Zones view page displaying availability zones related information for a selected cloud.

An example of OpenStack Availability Zones tab

For more information, see:

Viewing the OpenStack Availability Zones table

The Availability Zones table lists the following information for each availability zone 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 Availability Zones table title. For more information, see Sorting a table in the TrueSight console.

Availability Zones table: Description of columns

ColumnDescriptionStatistical Type Metrics 
Availability Zone

Name of the availability zone. Clicking on one of the zones in this column of the summary view takes you to the availability zone details view.

Last Value NAME
CPU [GHz]Total CPU capacity available in the selected zone, measured in GHz.Last ValueTOTAL_CPU_MHZ
CPU Used [GHz]Total CPU used by all the host aggregates in the selected zone, measured in GHz.95th percentile


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


Memory Util [%]Percentage of total physical memory utilized by the host aggregates in the selected zone.95th percentile MEM_UTIL
Memory Trend [%]Daily growth rate of memory utilization of the zone.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 capacityofthedatastore, measured in GB.Last valueTOTAL_DSTORE_SIZE
Datastore Used [GB]Total used spaceinthedatastore, measured in GB.95th percentile


DatastoreUtil[%]Percentageoftotaldatastorecapacityusedby the host aggregates in the selected zone.95th percentile 


Datastore Trend [%]Daily growthrateofdatastoreutilizationofthe zone.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 Availability Zone. 

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 Availability Zone.

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 for a selected zone.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

Specifies the basis for calculating the number of additional VMs that can be placed in the Zone: TYPICAL or CUSTOM. 

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

Days to SaturationThe projected amount of time before one of the resources (CPU, MEMORY, STORAGE) in the Zone runs out of available capacity. A number of days to saturation for the least available resource is reported here.

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 an availability zone

After you click on the zone in the Availability Zone column, the details for that zone are displayed in the Availability Zone Details page: 

Availability Zone Details table

Section or PanelDescription
General details section

General details, such as availability zone 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 availability zone

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

Tags panelDisplays tags, if any, that are associated with the availability zone. You can add tags to the availability zone 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 availability zone 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 availability zone

An example of the Availability Zone 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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