VMworld Reveals: vMotion innovations

Advertise here with BSAAt VMworld, various cool new technologies were previewed. In this series of articles, I will write about some of those previewed technologies. Unfortunately, I can’t cover them all as there are simply too many. This article is about enhancements that will be introduced in the future to … [Read more...]

How to disable DRS for a single host in the cluster

Advertise here with BSAI saw a question today which was interesting, how do I disable DRS for a single host in the cluster? I thought about it, and you cannot do this within the UI, at least… there is no “disable DRS” option on a host level. You can enable/disable it on a cluster level but that is it. … [Read more...]

High latency VPLEX configuration and vMotion optimization

Advertise here with BSAThis week someone asked me about an advanced setting to optimize vMotion for VPLEX configurations. This person referred to the vSphere 5.5 Performance Best Practices paper and more explicitly the following section: Add the VMX option (extension.converttonew = “FALSE”) to virtual machine’s … [Read more...]

What is new for vMotion in vSphere 6.0?

vMotion is probably my favourite VMware feature ever. It is one of those features which revolutionized the world and just when you think they can’t really innovate anymore they take it to a whole new level. So what is new? Cross vSwitch vMotion Cross vCenter vMotion Long Distance vMotion vMotion Network … [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...]

Disable vMotion for a single VM

This question pops up regularly on the VMTN forums and reddit. It’s a viable question but the admins who request this feature usually don’t want Maintenance mode to break or any other feature that helps them to manage large scale environments. When you drill down, you discover that they only want to limit the option of … [Read more...]

vSwitch Traffic Shaping, what is what?

I was troubleshooting an issue where vMotion would time-out constantly, I had no clue where it was coming from so I started digging. In this case the environment was using a regular vSwitch and 10GbE networking. When I took a closer look I noticed that some form of traffic shaping was applied, as unfortunately the … [Read more...]

Did you know, no VMotion when HA network partitioned

During my migration from vSphere 4.1 to vSphere 5.5, I ran into an issue I had never experienced before. When your VMware HA network is partitioned, vCenter will not let you perform VMotions. At first I was surprised but after some searching I learned the reasons behind it and it makes complete sense now. I had a … [Read more...]

Drag and drop vMotion not working with the 5.5 Web Client?

A couple of weeks I bumped into this issue where I constantly received a red cross when I wanted to “drag and drop” vMotion a virtual machine using the vSphere 5.5 Web Client. Annoying as it is something which I was waiting for to use as I used this all the time with the vSphere Client. Unfortunately it so … [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...]