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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 tab under Cloud OpenStack displays information for all availability zones for the selected cloud. You can access the Availability Zones tab in one of the following ways:

  • Select Views > All Views > Cloud > OpenStack > Availability Zones.
  • In the OpenStack > Cloud details page, click the Availability Zones link under the Configuration Data table.

This tab contains the Availability Zones table that displays the following information for each availability zone in the selected cloud:

Availability Zones table: Description of columns

ColumnDescriptionStatistical Type Metrics 
NameHyperlinked name of the host aggregate in the Availability Zone. For more information, see Host Aggregates.Last Value NAME
CPU Capacity [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_UTILMHZ

CPU Utilization [%]Percentage of total CPU utilized by the selected zone.95th percentileCPU_UTIL
CPU Trend [%]The daily growth rate of CPU utilization of the zone.TrendTrend based on CPU_UTIL
Memory Capacity [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

MEM_CONSUMED

Memory Utilization [%]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.TrendTrend based 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 Capacity [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

TOTAL_DSTORE_USED

Datastore Utilization [%]Percentage of total datastore capacity used by the host aggregates in the selected zone.95th percentile 

TOTAL_DSTORE_UTIL

Datastore Trend [%]Daily growth rate of datastore utilization of the zone.TrendTrend based 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 !in Recalculating the spare VM basis.

NATYPICAL or CUSTOM
Days to SaturationThe projected amount of time before one of the resources (CPU, MEMORY, STORAGE) in the Zone runs out of available capacity. 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 

IND_DAYS_TO_SATURATION

 

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

Related topics

Cloud (OpenStack)

Regions

Host Aggregates

Hypervisors

Instance Types

Tenants (OpenStack)

Cloud Map (OpenStack)

Recommendations (OpenStack)

Settings (OpenStack)

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