not triggered alarm not: insufficient vSphere HA failover resources

This alarm is only triggered when a HA action fails?  I have a cluster of two hosts ESXi 5.0, and since I'm on more than 50% of available memory on each host, for me, it seems that I can't tolerate a single host failure.

RAMdistChart.PNG

HA and DRS are enabled on the cluster, and the "admission control policy", I have 'percent of reserved failover cluster resources', set at 50%.

So why no alarm?  My goal is to get an alert before to reach the State we begin, where we cannot tolerate apparently not a failure of the host.

> Based on this and the absence of the alarm, we can assume that if I dropped one of the hosts of this 2-host cluster, all the virtual machines would be able to start on the only host remaining, correct?

Correct, if one of your guests crashed or zero all your VMS would have sufficient resources to start (no guarantee of performance, just start/running)

> And the alarm, I want to talk to the title of this thread only is triggered when what 98% to 50% or less, correct?

There's no alarm. When your ability to failover CPU or memory reaches 50% admission control will prevent you from turn another VM

> I am still concerned about the diagram of distribution of this resource for memory, however. It looks like I could push up to 100% on both hosts and still no push failover memory less than 50% capacity. I guess that this is due to the fact that my virtual machines have no memory reserved, so vSphere counts only the minimum amount of memory to start the virtual machine, and it will depend on permutation and balloon so all virtual machines start actually using all of their memory.

Fix

> So the alarm I'm looking for is the one that reproduces the table of distribution of resources and alerts when the total unused memory in the cluster is less than the total memory to a single host.  Make sense?

I'm not aware of an alarm like this. You may be able to find something through google or create something yourself. On the creation of reserves for your virtual machines? Or less the most important? This way you can ensure that they will get resources when they restart. Or if you really want you can replace admission control by hosting dedicated failover policy? (I do not think that I recommend with what I know of your situation, but it will give you what you ask for).

Have you watched the vRAS fling? VM and Service availability & #8211 resources; VMware Labs

This adventure allows you to perform a host on your infrastructure failure analysis. You can simulate the failure of one or more hosts in a cluster (vSphere) and identify how:

  • Virtual machines will re-start safely on different hosts
  • Virtual machines would not be restarted on different hosts
  • Virtual machines would be the degradation in performance when rebooted on a different host

With this information, you can better plan the location and configuration of your infrastructure to reduce the downtime of your virtual machines / Services in case of failure of the host.

Tags: VMware

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