In a small vSphere environment that I’ve recently been working on, I started to notice that some of my VMs were disappearing off the network from time to time. Reboots of the VM didn’t seem to fix the issue but a quick vMotion of the VM to another host did. If you haven’t figured it out yet, one of my hosts was missing a VLAN and VMs connected to a certain portgroup were affected whenever they ran on the host. vSphere will warn you if a host that you’re trying to migrate a VM to doesn’t have the right portgroup and host profiles (if you’re using Enterprise Plus licensing) will alert you to the fact that a portgroup isn’t configured with the right VLAN ID but nowhere in vSphere will you get an alert if a required VLAN is not […]
I’m not convinced that this is supported, but it did work. As with anything on a blog, use at your own risk. I was working on rebuilding my home lab and wanted to clear down the host that my vCenter VM was sitting on. Before doing that I wanted to rescue some files from it (long story). For some reason it hung on me and wouldn’t respond so I tried to reset it. This process got as far as 95% and then got stuck 🙁 One way to unstick such a VM is to SSH onto the hosts that it’s running on and use the vm-support command. How? Run “vm-support -x” to show the world IDs of the running VMs on the host: The one that I wanted was 9190. Using “vm-support -X 9190” and answering “y” to the three […]
Having recently made a right old mess of my home lab, I set about building it from scratch over the weekend. Having installed some nice, fresh builds of ESXi 5.0 I started adding in my SATA disks and began to create VMFS datastores on the hosts.
The first one worked ok. The second one didn’t for some reason. I got an error part way through the “Add Storage” wizard. The error stack wasn’t too helpful:
Call “HostDatastoreSystem.QueryVmfsDatastoreCreateOptions” for object “datastoreSystem-9” on vCenter Server “svr-vcenter.vspecialist.co.uk” failed.
This isn’t just another article about vSphere 5. It’s not my aim simply to rattle off a list of new and improved features. There are probably a plethora of those posts out there already, some better than others – use Google to find them. I was inspired to write this after I saw white paper linked to on Twitter about the differences between ESX and ESXi written by Global Knowledge. Actually it was the responses to that article that prompted me. Of all of the many changes announced today, it is the departure of the Service Console that is perhaps the most significant in my view. It may not be a new, super-whizzy feature and many people are already using ESXi and might be thinking “so what”. For me, removing the COS / SC / Service Console is significant for […]
If, like me, you make your ESX / ESXi server passwords nice and complex you end up having to dig them out of a password safe every time you want to connect directly to one of them. Or you have an SSH connection manager of some sort perhaps. Even then, there will come a time when you want to connect directly and that 16 character, random, mixed case password just isn’t memorable enough for you to use it. Luckily if you’re running vSphere 4.1 or later you can configure your hosts to use AD authentication. Hooray! Obviously there are security implications to doing this. Each environment is different and any risks should be considered before implementing this. So, let’s deal with the pre-requisites first. There are three of those: Time synchronisation – Your ESX / ESXi hosts must be synchronised […]