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Measures reported by VCEsxHostConnTest
This test reports the current state of each ESX server managed by vCenter. Disconnected hosts, hosts in the maintenance mode, and powered off hosts can be quickly identified using this test.
The measures
made by this test are as
follows:
| Measurement |
Description |
Measurement Unit |
Interpretation |
| Connection_status |
Indicates the current connection state of this vSphere/ESX server. |
|
The values this measure reports and their numeric equivalents are provided in the table below:
| Measure Value |
Numeric Value |
| Disconnected |
0 |
| Connected |
1 |
| NotResponding |
2 |
Note:
Typically, this measure reports one of the Measure Values listed in the table above. In the graph of this measure however, the connection state of an ESX server is indicated by its corresponding numeric equivalent only - i.e., 0 to 2.
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| Ha_cluster_state |
Indicates the current availability state of this host in an HA cluster. |
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In a vSphere HA cluster, the active hosts form a fault domain. A host is inactive if it is in standby or maintenance mode, or it has been disconnected from vCenter Server. A vSphere HA agent, called the Fault Domain Manager (FDM), runs on each host in the fault domain.
One FDM serves as the master and the remaining FDMs as its slaves. The master is responsible for monitoring the availability of the hosts and VMs in the cluster, and restarting any VMs that fail due to a host failure or non-user-initiated power offs. The master is also responsible for reporting fault-domain state to vCenter Server.
The master FDM is determined through election by the FDMs that are alive at the time. An election occurs in the following circumstances:
- When the vSphere HA feature is enabled for the cluster.
- When the master's host fails.
- When the management network is partitioned. In a network partition there will be a master for each partition. However, only one master will be responsible for a given VM. When the partition is resolved, all but one of the masters will abdicate.
- After a host in a vSphere HA cluster powers back up following a failure that caused all hosts in the cluster to power off.
The slaves are responsible for reporting state updates to the master and restarting VMs as required.
The values that this measure reports and their numeric equivalents have been discussed in the table below:
| Measure Value |
Numeric Value |
| Master |
0 |
| ConnectedToMaster |
1 |
| Election |
2 |
| Uninitialized |
3 |
| NetworkPartitionedFromMaster |
4 |
| FdmUnreachable |
5 |
| HostDown |
6 |
| NetworkIsolated |
7 |
| InitializationError |
8 |
| UnitializationError |
9 |
Note:
Typically, this measure reports one of the Measure Values listed in the table above. In the graph of this measure however, the availability state of an ESX server in an HA cluster is indicated by its corresponding numeric equivalent only - i.e., 0 to 9. |
| Is_maintance |
Indicates whether this host is currently in the maintenance mode or not. |
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If a vSphere host is in the maintenance mode, then VMware HA suspends failover operations during maintenance operations. In other words, when a host enters the maintenance mode, VMs are prevented from powering up or failing over to the host if that host is taking part in a high availability cluster.
The values this measure reports and their numeric equivalents are provided in the table below:
| Measure Value |
Numeric Value |
| Yes |
1 |
| No |
0 |
Note:
Typically, this measure reports one of the Measure Values listed in the table above. In the graph of this measure however, the maintenance mode of an ESX server is indicated by its corresponding numeric equivalent only - i.e., 0 or 1. |
| Standbymode |
Indicates whether this host is currently in the standby mode or not. |
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The VMware Distributed Power Management (DPM) feature allows a DRS cluster to reduce its power consumption by powering hosts on and off based on cluster resource utilization. VMware DPM monitors the cumulative demand of all virtual machines in the cluster for memory and CPU resources and compares this to the total available resource capacity of all hosts in the cluster. If sufficient excess capacity is found, VMware DPM migrates all the virtual machines on one/more hosts to other hosts and places such hosts in the standby mode (i.e., powers off the hosts). Conversely, when capacity is deemed to be inadequate, DRS brings hosts out of standby mode (powers them on) and migrates virtual machines, using VMotion, to them.
The values this measure reports and their numeric equivalents are provided in the table below:
| Measure Value |
Numeric Value |
| None |
0 |
| In |
1 |
| Entering |
2 |
| Exiting |
3 |
Note:
Typically, this measure reports one of the Measure Values listed in the table above. In the graph of this measure however, the standby mode of an ESX server is indicated by its corresponding numeric equivalent only - i.e., 0 to 3. |
| Power_state |
Indicates whether this host is currently in the standby, powered off, or powered on mode. |
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The values this measure reports and their numeric equivalents are provided in the table below:
| Measure Value |
Numeric Value |
| Unknown |
0 |
| PoweredOn |
1 |
| PoweredOff |
2 |
| StandBy |
3 |
Note:
Typically, this measure reports one of the Measure Values listed in the table above. In the graph of this measure however, the power state of an ESX server is indicated by its corresponding numeric equivalent only - i.e., 0 to 3. |
| Availability_status |
Indicates whether this host is currently in the maintenance, standby, powered on, or powered off modes. |
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The values this measure reports and their numeric equivalents are provided in the table below:
| Measure Value |
Numeric Value |
| In maintenance |
0 |
| PoweredOn |
1 |
| Unknown |
2 |
| PoweredOff |
3 |
| StandBy |
4 |
Note:
Typically, this measure reports one of the Measure Values listed in the table above. In the graph of this measure however, the availability state of an ESX server is indicated by its corresponding numeric equivalent only - i.e., 0 to 4. |
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