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pegasus20111014
Contributor
Contributor

Error: "The vSphere HA agent on this host cannot reach some of the management network addresses of other hosts, and HA may not be able to restart VMs if a host failure occurs..."

I just want to verify that this error is the result of normal behavior when a host goes down in a cluster.  We are migrating to vCenter 5.1 (from version 4.1) and are testing three ESXi 4.1 servers in a cluster in vCenter 5.1.  Part of this was to test HA.

I connected to one of the ESXi hosts via ILO and restarted the host directly from the console.  When the server went down for a reboot, the VMs on that server failed over to the other ESXi hosts in the cluster as expected.  A few minutes later, while the one host is still down and in the process of rebooting, we receive an alert on the first node in the cluster (shows HA state of "Connected (Slave)") stating:

"The vSphere HA agent on this host cannot reach some of the management network addresses of other hosts, and HA may not be able to restart VMs if a host failure occurs:  {servername / IP]"  (the server name and IP being that of the server that we rebooted from the ESXi console)

The second host in our cluster shows the HA status as "Connected (Master)" and this alert does not show for this server.

Once the third node is back up from the reboot, the error goes away.  Is this message normal when a server in a cluster goes down in vCenter 5.1?

Thanks

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sparrowangelste
Virtuoso
Virtuoso

if host1 (master) cannot handle a failure of host 2 and 3, then that would make sense.

since you are probably not operating at 33% per host, the HA agent is saying that that if you lose another host HA cant bring everuything up.

--------------------- Sparrowangelstechnology : Vmware lover http://sparrowangelstechnology.blogspot.com
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pegasus20111014
Contributor
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actually node 1 shows as HA slave (where I receieved the error).  With 3 hosts online in the cluster, I show current failover capacity as 2 hosts (we've set to allow 1 host in HA).  We only have 5 VMs on this cluster, the hosts have 2 quad core processors with 128gb of ram a piece.

When I take a host down, the VMs fail over but I receive the message on host 1 (HA slave) that I specified in my first post.  With 1 host down current failover capacity changes from 2 to 1 but I still receive the message that "the HA agent on this host cannot reach some of the management network addresses and may not be able to start VMs if a host failure occurs".  I just wanted to confirm if this message is normal whenever you lose a host in an HA cluster in vCenter 5.1?

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