virtual machine – measure windows cpu performance when limits are applied

In the previous posts I wrote about virtual machine cpu limits not being exposed to the guest OS. This presents concerns for systems and application admins when investigating performance related issues The example vm has a cpu limit of 750 MHz, though neither the OS or vCenter are triggering alarms. Keep in mind; operating system cpu percentage values […]

PowerCLI – Get-ByBlueFolder List VM HardDisk and Scsi Id Information

List information for virtual machine harddisk, harddisk number, size, scsi id, and raw canonical name This can be run against a single vm or all vms in a blue folder (use get-folder to list folder names…)   [code language=”powershell”] <# Get-ByBlueFolderVmHardDiskScsiId .Description Get vm’s hard disk, SCSI position and RDM cannonical name russ 02/02/2016 .Acknowledgments […]

PowerCLI – Get-VmMhzUsage

This will collects highest 10 samples of vm cpu usage within a set period It is part of a series for investigating cpu constrained vms and can be run on either a single vm or a cluster   [code language=”powershell”] # Acknowledgement: the absolutely brilliant Jason Coleman – # Modified russ 25/01/2016 # To […]

Insanely simple and incredibly useful PowerCLI snipits

I find that I’m spending an increasing amount of time in PowerCLI, partly that’s because I am working with groups of hosts or vms. It’s not that I’m working with scripts all the time, just that if I need to do some action at scale, a foreach loop is going to save a bunch of […]

nsx lab – configure ECMP

If you are following on from other labs, before we start to configure ECMP, we need to do some cleanup, disable L2VPN on both edges, then remove the Trunk Interface from ESG-1 As this is a copy of a section of HOL 1603 I will not be including screen shots, – the folks at VMware […]

virtual machine performance – high cpu ready lab

Application issues, undersizing a virtual machine, or applying a restrictive cpu limit can all result in cpu ready CPU Ready is the primary indicator of a cpu performance issue. Although it’s possible to create a cpu-ready alarm, every VMware admin needs to be able to recognize what the values mean.   How much cpu ready is ok It is […]

PowerCLI – Get-VmReadySpikesForXDays

Check up on ready values per cluster or vm PowerCLI Script for determining virtual machine ready values over a set threshold during a specified period. Use this script before applying vm cpu ready alarms to vCenter Read the explanatory post, so as to understand what is being generated and why it is important. Note: this […]