vSphere 7.0 U2 Suspend VMs to Memory for maintenance!

In vSphere 7.0 U2 a new feature popped up for Lifecycle Manager. This new feature basically provides the ability to specify what should happen to your workloads when you are applying updates or upgrades to your infrastructure. The new feature is only available for those environments which can use Quick Boot. Quick Boot … [Read more...]

Can I vMotion a VM while IO Insight is tracing it?

Today during the Polish VMUG we had a great question, basically, the question was if you can vMotion a VM while vSAN IO Insight is tracing it. I did not know the answer as I had never tried it, so I had to test and validate it in the lab. While testing it became obvious that IO Insight and vMotion are not a supported … [Read more...]

Same EVC level, still no VMotion

To save on Microsoft SQL licenses, we decided to merge two VMware Clusters into one. The clusters were in different vCenters and the source Cluster was running ESXi 6.5u2 and the target cluster was ESXi 6.5u1. Both clusters were at the same Westmere EVC Level but a Cross vCenter VMotion failed with “The target … [Read more...]

Nasty HP software bug hits vSphere 5.1 and 5.5 and helpful info to fix this

Recently I got a call from a customer he was not able to log in to his ESX 5.5 hosts anymore trough ssh, and could not vMotion VM’s anymore. It seemed like the ssh daemon died and trying to start it again did not work. I was able to log on to one of the hosts (DL380 G8) and have a look at the vmkernel.log … [Read more...]

Minimum bandwidth requirements per concurrent vMotion?

I have been digging for a long time now to figure out what the minimum bandwidth requirements are per concurrent vMotion. After a long time I finally managed to get a statement. In the past the statement was made that 622Mbps was the minimum required bandwidth for vMotion, it appears that this is incorrect for vSphere … [Read more...]

VMware: vMotion migration socket connected returned: Already disconnected

Today a customer told me that he couldn’t vMotion virtual machines between a few hosts, he received this warning message: Migration to host <<unknown>> failed with error Already disconnected An unknown error has occurred. vMotion migration socket connected returned: Already disconnected   Solution: … [Read more...]