Since ESX 4u1 you have a new SCSI controller type available for your guests, the VMware Paravirtual SCSI Controller.
From several sources we learn that the performance of this controller is better.
See for example the New !! Open unofficial storage performance thread where Lars gave some interesting performance figures.
And in the PowerCLI Community there is a recent thread, called Change SCSI adapter to paravirtual with PowerCLI, where the user asks how he can change his disk adapters.
Reason enough to look how I could use PowerCLI to migrate guests to the VMware Paravirtual SCSI Controller.
Continue reading Switching to the Paravirtual SCSI Controller
One of the more popular post in the VMTN PowerCLI community is this one HowTo search for all VMX files in all datastores and register them into VC ?
The original script that I provided in the thread is now more than one year old and there seem to be some issues with clusters in a vSphere environment.
Time to re-write the script and make it a bit more userfriendly.
Update 1: there was an issue when scanning empty datastores
Update 2: added the option to find and register Templates
Update 3 – April 29th 2010: added the option to ignore specific folders
Update 4 – April 30th 2010: fixed parent datacenter lookup problem + added -checkNFS and -whatif option
Update 5 – May 2nd 2010: fixed a bug with nested folders and the -ignore parameter
Update 6 – August 6th 2010: minor changes to the parameter testing and the Get-Usage function
Update 7 – August 17th 2010: fixed a bug with the -dsNames option. Thanks to goonzie for reporting the bug
Continue reading Raiders of the Lost VMX
In the previous part of this series (Alarm expressions – Part 1 : Metric alarms) I showed how you could create alarms that are triggered when a metric crosses a watermark.
In this part I will show you how to create alarms when one or more specific events occur in your vSphere environment. More specifically I will show you how to create an alarm that will fire when someone adds or removes a license from your vCenter.
Continue reading Alarm expressions – Part 2 : Event alarms
In a previous entry (Scripts for Yellow Bricks’ advise: Thin Provisioning alarm & eagerZeroedThick) I showed how you could use performance metrics to fire an alarm. The MetricAlarmExpression in that script requires a PerfMetricId to specify which performance metric the alarm should monitor. The counterId in that object is an integer and it is perhaps not too obvious which value corresponds with which metric.
This blog entry shows how you can quickly get a list of permitted counterIds (and instances) for a specific entity. And it will show how to create some “impossible” alarms !
Continue reading Alarm expressions – Part 1 : Metric alarms
In the Developer forum there was an interesting post called Resources for folks new to the vSphere Web Services SDK. Now unfortunately the Hello World guide was (again) only aimed at Java programmers.
Although PowerCLI is nearing perfection, you sometimes will have to go to the SDK methods and properties to make your script go that extra mile. Since I know, from first-hand experience, that the first steps in the SDK are not that simple for PowerShell programmers/scripters I decided to start a series to make the SDK more accessible for the PS people.
Continue reading PowerCLI and the SDK – Part 1
The PowerCLI Team yesterday published with the Onyx Project a great tool with lots of potential. The blogging community received Carter’s announcement enthousiastically (see for example The Onyx has landed).
As a casual PowerCLI user you might think, the product has a strange name but it is the answer to all my scripting and automation needs. Why should I bother learning all these PowerCLI cmdlets while this tools produces working code. But think again !
Continue reading Onyx – Why Learn PowerCLI ?
On the Yellow Bricks blog there was today a very interesting entry called Performance : Thin Provisioning. Besides the link to the excellent VMware document called Performance Study of VMware vStorage Thin Provisioning, Duncan also included some tips and tricks.
Since I’m in favour of automating as much as possible in my vSphere environment, I decided to have a look how all this could be scripted.
In a recent PowerCLI Community thread someone asked how he could create Alarms with the current PowerCLI build. Since there is no PowerCLI cmdlet (yet) to create Alarms I had to fall back on the CreateAlarm method from the SDK.
The procedure as described in the vSphere Web Services SDK Programming Guide, chapter 15, is quite simple. The script I wrote created the alarm, but to my amazement I couldn’t use the Edit Settings option in the vSphere client. The option was grayed out.
First I doubted the correctness of my script but after some tests I could confirm that the alarm worked correctly. Continue reading CreateAlarm not (always) compatible with the vSphere client
One of the interesting new features in vSPhere is vStorage Thin Provisioning. I’m not going to explain what Thin Provisioning is all about. For that you can consult several knowledgeable blogs (for example this entry on Virtual Geek) and/or books (for example Scott Lowe’s excellent Mastering VMware vSphere 4.0).
The problem I have with Thin Provisioning, is that there are a lot of existing guests and templates out there that were created with Thick VMDKs in the past. The only documented way I could find to convert these Thick VMDKs to Thin VMDKs was to use svMotion from the vSphere client.
Now that is not a solution I want to (or can) use in an automated environment. Continue reading Thick to Thin with PowerCLI and the SDK
An interesting question arrived in my mailbox recently. The user was trying to find out how he could assign a vCenter license. The vSphere API Reference clearly pointed to the UpdateAssignedLicense method.
But the value that should be provided in the entity parameter was a bit of a mystery. An entity ID for a vCenter was new for me.
Continue reading Assign a vCenter license