HA Agent on ESX-HOST in cluster CLUSTER-NAME has an error

If I wanted to, this could be a very big post all about configuring HA correctly. But I don’t want to reinvent the wheel. Instead I just want to share my experiences with this error:

HA Agent on ESX-HOST in cluster CLUSTER-NAME has an error

Odds are that you will eventually see this one pop up in vCenter for one of your ESX 3.x hosts. If you’re not sure what it means, well the translation basically is that the host displaying the error could fail and your VMs running on it probably won’t get started up automatically on another host. Essentially HA is broken on the host. (more…)

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vCenter 2.5 Update 4 released

Update 4 of vCenter 2.5 (the management tool for VMware’s Virtual Infrastructure) has been released. Not a huge number of new features and probably a few bug fixes is about all you’re going to get from it. The release notes can be found here. vCenter now supports the customisation of Windows 2008 guest operating systems as well as introducing a Performance Overview plugin that provides a single view of performance metrics – I look forward to having a look at that.

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Communication with the virtual machine may have been interrupted

I was trying to power up a new VM on an ESX 3.5 host just now and I got the following error: “A general system error ocurred: The system returned an error. Communication with the virtual machine may have been interrupted” Nice and helpful! It appears that there are two ways to fix this. The first is to reboot your ESX host. Of course this isn’t normally practical and you may have VMs running. The alternative is to make your way into the service console and issue the following command:

Assuming that no errors are displayed as the service is restarted you should be sound as a pound (although these days the £ isn’t worth much).

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Draw your VI in Visio with vDiagram

Alan Renouf is a busy man and always seems to be one step ahead of the game. This is certainly true of his latest creation – vDiagram. Many of you may be familiar with the Active Directory Topology Diagrammer (ADTD), a tool available from Microsoft that pulls information from Active Directory and draws it in a Visio diagram. The diagrams that it produces can save a lot of effort in technical documentation and the same sort of thing has been missing for Virtual Infrasructure for some time. Alan’s PowerShell script requires only PowerShell and Microsoft Visio 2003+ to produce a nice Visio diagram of your VI. Head on over to Alan’s site to download it and try it out.

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