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Performance Monitor ReportingRSS

VMware Virtual Machine Performace Tips and Reporting

Classification and Detection of Zombie Virtual Machines … Which tools should I use?

In this post I want to discuss what makes an Orphan or a Zombie in a VMware environment. I also want to introduce some of my favourite tools for detecting these malodorous fiendish creatures which can wreak havoc within your virtual world.

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Get VMs by Virtual Port Group with PowerCLI (vNugglets)

How to find out what VMs use a particular virtual port group, and quickly?  Well, we have just the thing.  And, it also helps to illustrate the practical use of LinkedViews and the UpdateViewData() method of .NET View objects (about which we pos ...
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Get VM by IP or MAC address via PowerCLI

I had need to get VMs based on IP, but, not particular IPs, just IPs in a certain subnet. Previously here on vNugglets we had a post about how to Find VM by NIC MAC Address. I have since added this logic to a function, and added the ability to get a VM by ...
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CPU Ready Percentage with PowerCLI

CPU Ready Time is the amount of time a VM is ready with a workload to use CPU but has to wait to be assigned a slot on the actual hardware CPU. Having a High CPU time can mean you have a host that is under CPU Contention.

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Tuning Linux (Debian) in a vSphere VM – Part 3 – /dev/random

So here we are – Part 3 and the final part of the Linux series.  The title of this part is /usr/bin/random because well the content will be indeed quite random.  I couldn't think of a way to classify the content of this post into a single catego ...
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Tuning Linux (Debian) in a vSphere VM – Part 2 – Virtual Hardware

Alright – so in Part 1 we covered LVM, partitioning and the basic installation of our VM.  Now its time to tackle a few key points as it pertains to virtual hardware.  Now there isn't a whole lot to cover here and honesty I'm just going to graze ...
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PowerCLI returns VM folder paths and IDs in a logical directory format

Useful for returning folder paths in a logical format.  Returns folder names and IDs in \path\to\folder format.  Also returns the Get-Folder ExtensionData object so it can be used in similar way to Get-Folder.

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Demystifying CPU Ready as a Performance Metric

CPU ready metrics is often overlooked or not understood correctly. CPU ready is when VM waits in a ready-to-run state  to be scheduled on one or more of the physical CPUs by the hypervisor. Ready-to-run state means usually when the VM has someth ...
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PowerCLI – export import VM annotations

Quick script to export or import virtual machine annotations to/from CSV format. Very handy in situation when virtual machine was unregistered and registered back in vCenter inventory. registering VM back won’t restore virtual machine annotations.

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Simple functions to get VM and VMhost CPU/RAM metrics

Just some easy to use functions that simplify working with the PowerCLI Get-Stat cmdlet. The 'Get-Stat handling' was developed by LucD (I steal a lot of his stuff :) check out his blog at http://www.lucd.info/), I just wrapped it in a function. Get-Stat c ...
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Get details of a virtual machine using PowerCLI (VirtualizationAdmin Blogs)

PowerCLI is a powerful tool in the virtual admins arsenal. Read on to learn more. PowerCLI is a PowerShell snap-in that you to perform advanced scripting against either vCenter or individual vSphere hosts. Let’s assume that you have Microsoft PowerShel ...
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Virtual Machine I/O – Fairness versus Performance (VMware vSphere Blog)

Many of you will have read various articles related to queue depths, especially in the area of LUN/device queue depths, and how these can be tuned to provide different performance for your I/O. However there are other queue settings internal to the VMkern ...
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Vroom! Scaling up Virtual Machines in vSphere to meet performance requirements–Part 2

In my original post, Scaling up Virtual Machines in vSphere to meet performance requirements, I described a unique need for the Software Development Team to have a lot of horsepower to improve the speed of their already virtualized code compiling systems. ...
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Is my VM running off the Snapshot Delta or Base disk?

I came across few instance recently where the the Virtual machine was either consolidating all the snapshots taken by backup software or adding/removing snapshots and at the same time Edit Settings of the virtual machine is not giving you any details as i ...
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Disable TCP Chimney offload

When it comes to the virutalisation , there are considerations for performance. There are options which are enabled by default which makes sense for laptops and even desktops. A VM, however, may not benefit and in fact may see performance loss. One such ...
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Investigating operating system CPU usage

This article guides you through determining CPU usage. CPU usage information is useful in addressing problems encountered with an operating system as a result of a process taking up excessive CPU cycles. CPU usage problems result in slow operating system ...
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VMware Virtual machine performance degrades while a vMotion is being performed

vSphere 5.0 introduces a new feature called Stun During Page Send (SDPS) to ensure that more active, large memory virtual machines are successfully vMotioned from one host to another. SDPS intentionally slows down the vCPUs just enough to keep the virtual ...
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vCenter and Memory metrics

I have received an email today asking if I could explain the memory details that are in vCenter under the summary tab on each VM. Rather than reinvent the wheel I have taken a blog post from Duncan Epping over at www.yellow-bricks.com which I find explain ...
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Condusiv V-locity 4 – New caching feature

I recently got hold of a copy of the new V-locity 4 product from Condusiv which was released last month. Condusiv is the new name for Diskeeper, whom you may have heard of before. I first came across them as a provider of software which specialized in opt ...
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Disk.SchedulerWithReservation aka mClock

A long time ago when playing around in my lab with vSphere 5.1 I stumbled across this advanced setting called Disk.SchedulerWithReservation. I start digging to see what I could do with it and what it was about... if I could anything with it at all.

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