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HOW TO: Suppress Configuration Issues and Warnings Alerts after enabling vSphere HA in a VMware vSphere Cluster with only a single datastore

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Andrew Hancock (VMware vExpert / EE MVE^2)
MVE^2, Expert of the Year 2017-2011, Scribe 2016-2012, Author of the Year 2017-6,2013-2012 VMware vExpert 2018-2011 27 years of experience.
In VMware vSphere 4 1 and 5.0, if you have two or more hosts, using shared storage, (SAN/NAS) you can create a VMware vSphere Cluster and enable High Availability mode (HA), if you have the correct VMware vSphere Licensing.

VMware vSphere High Availability (HA) provides easy to use, cost effective high availability for applications running in virtual machines. In the event of VMware vSphere server failure, affected virtual machines are automatically restarted on other VMware vSphere production servers with spare capacity.

You may have noticed that after Turning On vSphere HA in Cluster settings from the vSphere Client that a Configuration Issues warning yellow box may appear on the Summary page of ALL host ESXi servers in the vSphere Cluster.

The Configuration Issues reports The number of vSphere HA heartbeat datastores for this host is 1, which is less than requried: 2
The Configuration Issues reports "The number of vSphere HA heartbeat datastores for this host is 1, which is less than requried: 2"

or another common configuration issue, when there are no shared datastores

The number of vSphere HA heartbeat datastores for this host is 0 which is
less than required 2


You will also notice there is also a yellow/orange warning triangle displayed on ALL the vSphere ESXi host servers in the vSphere Cluster.

Warning trianles on hosts in vSphere Cluster
(in the above example cluster screenshot, you may also notice "blue sleeping" icons, this indicates, the hosts are currently in standby mode. vSphere Distributed Resource Scheduling (DRS) (with Distributed Power Management (DPM) ) is included in the vSphere Enterprise and Enterprise Plus edition.

Distributed Resource Scheduler (DRS) - Dynamic Resource Balancing

The only issue, is that the Warning triangle displayed in VMware vSphere vCenter can mask real warning events.

VMware vSphere HA will still function correctly, the configuration issue, is warning that there is only one datastore connected to the ESX/ESXi host. Heartbeat datastores were introduced in VMware vSphere vCenter Server 5.0. (the warning will be issued, if you also have a mix of ESX/ESXi 4.x or ESX/ESXi 5.0 hosts managed by VMware vSphere vCenter Server v5.0)

These configuration issues and warnings alert triangles, can be suppressed as follows

1. Connect to the VMware vSphere vCenter Server


Using the VMware vSphere Client, login and connect to the VMware vSphere vCenter server. Use the IP address or hostname of the VMware vSphere vCenter server, and use the vCenter Server Administrator username and password credentials.

    Using the VMware vSphere Client, Login and Connect to the VMware vSphere vCenter Server  Using the VMware vSphere Client, Login and Connect to the VMware vSphere vCenter Server

2. Select the Cluster in Inventory


Select the Cluster in Inventory > Hosts and Clusters, Right Click the Cluster in the right hand panel, and select Edit Settings

    Right Click the Cluster in the right hand panel, and select Edit Settings  Right Click the Cluster in the right hand panel, and select Edit Settings

The vSphere Cluster settings dialogue box will be opened.

vSphere Cluster Settings

3. Select vSphere HA


Select vSphere HA and click Advanced Options, bottom right

vSphere HA Advanced Options
the Advanced Options (vSphere HA) dialogue box will open.

vSphere HA Advanced Options

4. Add ‘das.ignoreInsufficientHbDatastore’ value


To suppress the configuration issues box and warning triangles, the das.ignoreInsufficientHbDatastore needs to be added with a value of TRUE.

Click the left hand column under Option, and enter das.ignoreInsufficientHbDatastore

enter das.ignoreInsufficientHbDatastore
Click the right hand column under Value, and enter TRUE.

enter TRUE
Click OK to return to Cluster Settings.

5. Click Cluster Features


Click Cluster Features and remove the Tick from Turn On vSphere HA.

This action will disable HA on ALL ESX/ESXi hosts in the cluster. Please note I would recommend any changes to a production environment be carried out and schedule out of core SLA hours.

Turn OFF HA
Click OK. The HA cluster will be reconfigured, this will take a few seconds.

6. Turn On vSphere HA


Select the Cluster in Inventory > Hosts and Clusters, Right Click the Cluster in the right hand panel, and select Edit Settings

     Right Click the Cluster in the right hand panel, and select Edit Settings  Right Click the Cluster in the right hand panel, and select Edit Settings
The vSphere Cluster settings dialogue box will be opened.

Turn OFF HA
Select Turn ON vSphere HA (by clicking and ensuring a Tick appears in the box)

Turn ON vSphere HA
Click OK.

The HA cluster will be reconfigured, this will take a few seconds (test with five hosts took 40 seconds).

 HA Configuration Issues Suppressed
The Configuration Issues yellow box in the Summary Page and Warning Triangle will disappear immediately. (the configuration issue can also be overcome by adding the minimum number of datastores to satisfy the condition!).

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by:younghv
"Yes" vote above.
Very nicely detailed instructions and should prove helpful for a lot of people.
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by:*** Hopeleonie ***
"Yes" vote above.
Your Tutorials helped me everytime!
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