VMWARE

Written by Sam McGeown on 24/8/2012
Published under VMware and vSphere
Here’s a lesson in checking the basics! I added new ESXi 5 host to a cluster today and spent a good couple of hours troubleshooting the error: vSphere HA agent for host [Host’s Name] has an error in [Cluster’s Name] in [Datacenter’s Name]: vSphere HA agent cannot be correctly installed or configured After a few basic checks, migrating the host in and out of the cluster and rebooting, I headed off to google and began troubleshooting.
Written by Sam McGeown on 23/8/2012
Published under VMware
Just a quick post regarding the vSphere Management Assistant 5 - when deploying the vMA with a static IP address, you might see the following error: Power On virtual machine Cannot initialize property ‘ vami.DNS0.vSphere_Man- agement_Assistant_(vMA)’ , since network ‘’ has no associated IP pool configuration. Edit the vMA virtual machine’s properties and go to Options, vApp Options and select disable. Acknowledge the warning and click OK to close the VM properties.
Written by Sam McGeown on 20/8/2012
Published under VMware and vSphere
If you are close to the VMware ESXi storage path limit of 1024 paths per host, you may want to consider the following: local storage, including CD-ROMs, are counted in your total paths. Simply because of the size and age of the environment, some of our production clusters have now reached the limit (including local paths) - you see this message in the logs [2012-08-20 01:48:52.256 77C3DB90 info ‘ha-eventmgr’] Event 2003 : The maximum number of supported paths of 1024 has been reached.
Written by Sam McGeown on 19/7/2012
Published under VMware and vSphere
I’m currently updating a very small 4-host cluster built for a specific application within our datacentre, the hosts are IBM HS22 blades. Since we have the VMware Update Manager infrastructure in place already, I downloaded the IBM ESXi 5.0 Update 2 ISO and imported it into Update Manager, created a baseline and then applied it to the cluster. I scanned the cluster with the baseline and was issued this warning for each host:
Written by Sam McGeown on 28/10/2011
Published under Microsoft and VMware
Just a quick script to set the Path Selection Policy on any LUNs on a host that do not have your target policy enabled. The script sets the server to Maintenance mode first, evacuating any VMs if you are in a full DRS automated environment. While this is not strictly necessary, it was required for my production environment just to be safe. param( [string] $vCenterServer = $(Read-Host -prompt "Enter vCenter Server Name"
Written by Sam McGeown on 3/3/2011
Published under VMware
Recently I installed and configured a client’s new ESXi host, they’re a small company and only require a single host. The host in question was an IBM x3650 M3, an excellent workhorse for virtualisation and one of 5 or 6 of the same model that I’ve installed in the last year. In addition to the onboard Broadcom Dual Gigabit NIC, we always install at least a second Intel PCIx Dual Gigabit card for resilience/redundancy/performance.
Written by Sam McGeown on 12/11/2010
Published under VMware
Recently I had cause to configure iSCSI multipathing on a test ESXi server. The production environment servers use iSCSI HBAs to connect to the back end storage, so multipathing them is a straight-forward setup. It’s good practice to separate VMotion, virtual machine and iSCSI traffic, it also helps you manage those logical and physical connections. Connect to your ESXi server using the vSphere Client and select the host. Go to the configuration tab and click “Add Networking…”.
Written by Sam McGeown on 21/10/2010
Published under Networking and VMware
vMA is available as a Virtual Appliance (OVF) from VMware. To install it on VMware Workstation 7, open Workstation and select Import or Export to import a new OVF, the URL for the latest OVF for vMA is on the vMA download page As per this article on virtualkenneth.com, you need to edit the VMX file to change the SCSI card and OS type, otherwise you’ll have a kernel panic on boot.
Written by Sam McGeown on 25/5/2010
Published under VMware and vSphere
I rebuilt an ESX host in my HA/DRS cluster today, following my build procedure to configure as per VMware best practices and internal guidelines. When the host was fully configured and up-to-date, I added it to the cluster and enabled HA and DRS. Then I went to generate some DRS recommendations to balance the load an ease off my overstretched host, but no recommendations were made. I couldn’t manually migrate any VMs either – it was odd, because both hosts were added into the cluster, and could ping and vmkping each other from the console.
Written by Sam McGeown on 16/2/2010
Published under VMware and vSphere
So you’ve upgraded your ESX 3.x servers to 4.0 and you’ve upgraded your vCenter server, now you want to access the shiny new hot-add feature to upgrade some running server’s memory. Except you can’t, the feature is no-where to be seen. Something to bear in mind though, your OS needs to support hot-add, so you’ll need a Windows Enterprise or Datacenter edition. Here’s how to enable it: Upgrade the VM’s tools, if you haven’t already.