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What happens to VMs when a cluster is partitioned?
Advertise here with BSAI had this question this week around what happens to VMs when a cluster is partitioned. Funny thing is that with questions like these it seems like everyone is thinking the same...
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Partition / Isolation and VM flip flopping between hosts?
Advertise here with BSALast week I was talking to one of our developers at our R&D offsite. He has a situation where he saw his VM flip flopping between two hosts when he was testing a certain...
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VM showing that HA failure response is disabled in 6.5?
Advertise here with BSAI had a customer asking me today why on each VM it was showing that all HA responses are disabled. This customer is running vSphere 6.5 and below you can see what the UI showed....
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Using HA VM Component Protection in a mixed environment
Advertise here with BSAI have some customers who are running both traditional storage and vSAN in the same environment. As most of you are aware, vSAN and VMCP do not go together at this point. So...
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Insufficient configured resources to satisfy the desired vSphere HA failover...
Advertise here with BSAI was going over some of the VMTN threads and I noticed an issue brought up with Admission Control a while ago. Completely forgot about it until it was brought up again...
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Trigger APD on iSCSI LUN on vSphere
Advertise here with BSAI was testing various failure scenarios in my lab today for the vSphere Clustering Deepdive session I have scheduled for VMworld. I needed some screenshots and log files of when...
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What happens if all hosts in a vSphere HA cluster are isolated?
Advertise here with BSAI received this question through twitter today from Markus who was going through the vSphere 6.7 Clustering Deep Dive. And it is fairly straightforward: what happens when all...
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This host has no isolation addresses defined as required by vSphere HA
Advertise here with BSAI had a comment on one of my 2-node vSAN cluster articles that there was an issue with HA when disabling the Isolation Response. The isolation response is not required for...
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I discovered .PNG files on my datastore, can I delete them?
Advertise here with BSAI noticed this question on Reddit about .PNG which were located in VM folders on a datastore. The user wanted to remove the datastore from the cluster but didn’t know where...
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2 node direct connect vSAN and error “vSphere HA agent on this host could not...
Advertise here with BSAI’ve had this question over a dozen times now, so I figured I would add a quick pointer to my blog. What is causing the error “vSphere HA agent on this host could not reach...
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vSphere HA internals: VMCP super aggressive option in vSphere 7
Most of you probably heard about a feature called VMCP aka VM Component Protection. If not, this is the functionality in vSphere HA that enabled you to restart VMs which have been impacted by a PDL...
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Running vSphere 6.7 or 6.5 and configured HA APD/PDL responses? Read this…
If you are running vSphere 6.7 or 6.5 and have not installed 6.7 P02 yet (6.5 P05 is available soon) and you have APD/PDL responses configured within vSphere HA it could be that an issue causes VMs...
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Why does HA not power-on VMs after a full cluster shutdown?
I received this question and figured I would write a quick post about it, as it comes up occasionally. Why does vSphere HA no power-on VMs after a full cluster is brought back online after a full...
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The following VIBs on the host are missing from the image and will be removed...
I’ve seen a few people being confused about a message which is shown when upgrading ESXi. The message is: The following VIBs on the host are missing from the image and will be removed from the host...
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Disable the re-registering of HA disabled VMs on other hosts!
Years ago we had various customers that complained about the fact that they had VMs that were disabled for HA and that these VMs would not be re-registered when the host they were registered on would...
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