Posts Tagged ‘ESX’

Geographically dispersed cluster design

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Nowadays more and more companies have or are considering a 2nd datacenter in another site. Mostly the main reason for this 2nd datacenter is for disaster recovery purposes. There are 2 ways to utilize this 2nd datacenter. First one could choose for an active-passive setup, where in the 2nd datacenter bare-metal servers are waiting to [...]

UDA2.0 Test Drive

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I’ve always been using UDA1.4 for my ESX deployments up until ESX3.5. Now when it comes to vSphere the UDA1.4 isn’t a good fit anymore, because it doesn’t support ESX4. Luckily Carl Thijssen, the mastermind behind the UDA, released a 2.0 beta version  a couple of months ago, which, with a little help from Mike [...]

How big is my VM?

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If you want to know the size of your vm, you probably first look at the size of the virtual disks in the vm’s settings, but there’s more to it. A virtual machine consists of the following set of files:

Config files (.vmx, .vmxf, .vmsd, .nvram)
Log files (.log)
Disk files (.vmdk)
Snapshots (delta.vmdk, .vmsn)
Swapfile (.vswp)

To make things more complicated, these [...]

List HBA WWPNs and LUNs using Powershell

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Lately I’m moving around my VMs and storage luns between my ESX clusters a lot to accomplish a complete redesign of my Virtual Infrastructure. At some point I got lost and didn’t had the complete overview anymore. Which luns were attached to which cluster? To remove(unpresent) a lun from an ESX host/cluster on the storage [...]

Reconnect ESX hosts using PowerShell

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This week I ran into problems with vCenter server and almost all of my VMs were orphaned in vCenter. To resolve this issue I needed to disconnect/connect each ESX host. Because I hate doing repetitive tasks I created a little PowerShell script that I wanted to share with you.

# Variables
$VCServer = “vcserver.yourdomain.local”
$password = “rootPassword”

#Connect to [...]

Installing ESX 4.0 on VMware Fusion

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If you love VMware you have to love Apple and if you love ESX4.0 you have to love a Mac. Well, at least I know I do. Both companies are light years ahead of their competitors and characterized by superior design, excellent performance and both fighting Microsoft’s marketing machine.
Since I’m a great Mac fan and [...]

ESX Memory Management – Part 3

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In part 1, I explained the virtual machine settings that are available to us regarding to memory, in part 2, I explained how the ESX kernel assigns memory to a VM and in this part I will dive into ESX memory reclaiming techniques.
The ESX kernel uses transparent page sharing, ballooning and swapping to reclaim memory. [...]

ESX Memory Management – Part 2

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In part 1, I explained the virtual machine memory settings that are available to us. This caused quite some controversy on what would happen when a limit is hit that’s configured lower than the actual allocated memory.
Scott Herold did an excellent follow-up on this. Be sure to read his article too, because it contains valuable [...]

ESX Memory Management – Part 1

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I receive a lot of questions lately about ESX memory management. Things that are very obvious to me seem to be not so obvious at all for some other people. So I’ll try to explain these things from my point of view.
First let’s have a look at the virtual machine settings available to us. On [...]

Ken Cline’s Great vSwitch Debate

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Probably old information for insiders, but Ken Cline recently finished his trilogy on “The Great vSwitch Debate”. In his vSwitch trilogy he addresses everything you allways wanted to know but were afraid to ask about vSwitches. In part 1 of his series he introduces the concept of a vSwitch, in part 2 he talkes about the security [...]