In my last post I was Exploring a Limitation of VMware DRS and I have encountered another situation that had similar symptoms but the resolution was quite different. This problem was occurring on a VMware ESX 3.5 cluster that was specifically affecting Windows 2008 R2 64bit virtual machines that were configured with four processors and eight gigabits of RAM. These virtual machines were taking an extreme amount of time to perform a reboot. During the reboot ESXTOP was showing insane %RDY with spikes climbing over 200. When the reboot would finally finish several services would have failed to start.
I have been a big fan of VMware’s Distributed Resource Scheduler (DRS). VMware DRS is a service or feature that will dynamically allocate and balance computing resources across the hosts in a cluster. In all of the environments I have work with so far, DRS has been a fantastic tool for getting and maintaining that balance across all the hosts in a cluster. Recently though I have come across a limitation of VMware’s DRS that is worth mentioning.
I have started the year 2011 out by looking at some of the different monitoring solutions available for us to have an insight into the health and welfare of the systems that we support. In your typical monitoring solution you would install the monitoring server in your environment and let the system discover all the devices in your infrastructure and or to control the licenses we would manually enter the devices that we want to monitor. Some of these monitoring servers solutions have to have a beefy box to begin with and all solutions will need a great deal of “tweaking” to control the number of false positives as well as time put in to be able to report on what exactly we care to be alerted about.
It is the start of 2011 and I hope everyone has not broken their New Year’s Resolutions already. To start the year off, I would like to encourage and or challenge you to become a part of your local VMware User Group or VMUG as we like to call it. Last year I did a post on My Experience with VMUGs and I am a full supporter of this program and the good it can bring. Although I have a bias for the VMUGS over other types of user groups, the concept of people helping people rates high in my book and I would like to challenge you all to get involved.
It is the last few days of the year and time for a review of virtualization 2010. Although VMware was founded in 1998 it was not until 2001 that I first heard of VMware and played with the workstation product to be able to run different flavors of Linux. So for me, 2010 closes out a great year in virtualization as a whole as well as a decade of virtualization and what a ride it has been.
Since its inception, virtualization has changed the information technology landscape in many ways. With all the good virtualization brings to the table, in some ways, virtualization has made things to easy. One example is the ease and speed that we are able to deploy new servers has virtual machines. No longer are we waiting on physical hardware to arrive for a new deployment. We can “clone” are golden image in a matter of minutes and be on our way.
I had a fun day resolving a licensing issue for a client. This one was a little different than I had seen in the past. The cluster is question is an eight node cluster running ESX 3.5. The error message that I received when trying to perform a vMotion was “Unable to migrate from HostA to HostB: Virtual machine has 2 virtual CPUs, but the host only supports 1. The number of virtual CPU’s may be limited by the guest OS selected for the virtual machine or by the licensing for the host.”
In my last post I talked about how to resolve an issue where a disgruntled employee walked out with the USB memory stick that had VMware ESXi installed on it. In that particular case, the VMware ESXi host kept on running and I was able to get a backup and restore the current running configuration via some PowerShell Magic. All in all it was a pretty easy issue to resolve with very little down time. This got me thinking about which method would be the best option to use in the Enterprise. Installing to local disks or installing to a USB memory stick.
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