On this Thanksgiving Eve in the US, it is easy to recount the things for which I am grateful: my family, my friends, my health, etc. Monday will be 6 years since I exited from my service in the Marine Corps. At that time I was not sure I would even stay in tech as a career (law school still seems like a good backup plan). I am incredibly grateful and humbled by my career and the trajectory it has taken in recent years. A substantial part of this has been involvement in the tech community, especially the VMware community. I’m far from the only person that has built a career on the back of the VMware community. I am thankful for the guidance and inspiration I have received over the past six years.
It’s that time of summer — VMworld US is only a few days away! Yet again I am making the trek to Las Vegas for the festivities. I wanted to highlight the sessions where I will be presenting so that you have the opportunity to either schedule and come heckle or remind yourself to watch later. I will be hanging around the vBrownBag area of VMvillage or the Rubrik booth when not presenting; come say hello!
vBrownBag EMEA is in the midst of recording sessions that cover the VCAP6-DCV Deploy (3V0-622) exam. If you are interested in presenting one of the exam objective, see the Call for Presenters post here.
Objective 2.2 – Map Service Dependencies
Skills and Abilities
- Evaluate dependencies for infrastructure and application services that will be included in a vSphere design.
- Create Entity Relationship Diagrams that map service relationships and dependencies.
- Analyze interfaces to be used with new and existing business processes.
- Determine service dependencies for logical components.
- Include service dependencies in a vSphere 6.x Logical Design.
- Analyze services to identify upstream and downstream service dependencies.
- Navigate logical components and their interdependencies and make decisions based upon all service relationships.
- Graham’s blog post on Objective 2.2.
- Don Ward’s post called “VMware Application Dependencies and Entity Relationship Diagrams”
Without further ado, the podcast recording can be found here:
This year I am honored to be one of the Virtual Design Master (vDM) judges. If you are unfamiliar with vDM, it is a technology driven reality competition that showcases virtualization community member and their talents as architects. Some competitors are seasoned architect while others are just beginning their design journey. To find out more information, please click here. One of the things that I, along with the other judges, noticed is that many of the contestants did not correctly document conceptual, logical, and physical design.
The best non-IT example that I have seen of this concept the following image:
The way I always describe and diagram design methodology is using the following image:
I will continue to refer to both images as we move forward in this post.
During the assess phase, the architect reaches out to the business’ key stakeholders for the project and explore what each need and want to get out of the project. The job is to identify key constraints and the business requirements that should be met for the design, deploy, and validation phases to be successful.
The assessment phase typically coincides with building the conceptual model of a design. Effectively, the conceptual model categorizes the assessment findings into requirements, constraints, assumptions, and risks categories.
- technicloud.com should create art.
- The art should be durable and able to withstand years of appreciation.
- Art should be able to be appreciated by millions around the world.
- Art cannot be a monolithic installation piece taking up an entire floor of the museum.
- Art must not be so bourgeoisie that it cannot be appreciated with an untrained eye.
- Art must not be paint-by-numbers.
- Lead IT architect at technicloud.com has no prior experience creating art.
- Mitigation – will require art classes to be taken at local community college.
- Lead IT architect is left-handed which may lead to smearing of art.
- Mitigation – IT architect will retrain as ambidextrous.
- Art classes at community college make artists.
- Museum will provide security as to ensure art appreciators do not damage artwork.
As you read through the requirements and constraints, the idea of how the design should look should be getting clearer and clearer. More risks and assumptions will be added as design decisions are made and the impact is analyzed. Notice that the conceptual model was made up entirely of words? Emphasis on “concept” in the work conceptual!
Once the conceptual model is built out, the architect moves into the logical design phrase (which indicated by the arrows pointing backwards in Figure 2, demonstrating dependence on conceptual). Logical design is where the architect begins making decisions but at a higher level.
Logical art work design decisions –
- Art will be a painting.
- The painting will be of a person.
- The person will be a woman.
For those who are having a hard time following with the art example, a tech example would be:
An example of what a logical diagram may look something like this:
Notice that this are higher level decisions and diagrams. We’re not quite to filling in the details yet when working on logical design. However, note that these design decisions should map back to the conceptual model.
Once the logical design has been mapped out, architect moves to physical design where hardware and software vendors are chosen and configuration specifications are made. Simply put, this is the phase where the details are determined.
Physical art work design decisions –
- The painting will be a half-length portrait.
- The medium will be oil on a poplar panel.
- The woman will have brown hair.
Once again, if you hate the Mona Lisa then the IT design decision example would be:
- XYZ vendor and model of storage array will be purchased.
- Storage policy based management will be used to place VMs on the correct storage tier.
- Tier-1 LUNs will be replicated hourly.
These are physical design decisions, which directly correlate and extend the logical design decisions with more information. But, again, at the end of the day, this should all tie back to meeting the business requirements.
An example of a physical design would be something like:
Notice that in this diagram, we’re starting to see more details: vendor, model, how things are connected, etc. Remember that physical should expand on logical design decisions and fill in the blanks. At the end of the day, both logical and physical design decisions should map back to meeting the business requirements set forth in the conceptual model (as evidenced by Figure 2).
Being able to quickly and easily distinguish takes time and practice. I am hoping this clarifies some of the mystery and confusion surrounding this idea. Looking forward to seeing more vDM submissions next week.
vBrownBag EMEA is in the midst of recording sessions that cover the VCAP6-DCV Design (3V0-622) exam. If you are interested in presenting one of the exam objective, see the Call for Presenters post here.
Objective 1.3 –Build Availability Requirements into a vSphere 6.x Logical Design
Skills and Abilities
- Evaluate which logical availability services can be used with a given vSphere solution.
- Differentiate infrastructure qualities related to availability.
- Describe the concept of redundancy and the risks associated with single points of failure
- Explain class of nines methodology
- Determine availability component of service level agreements (SLAs) and service level management processes
- Determine potential availability solutions for a logical design based on customer requirements.
- Create an availability plan, including maintenance processes.
- Balance availability requirements with other infrastructure qualities.
- Analyze a vSphere design and determine possible single points of failure.
- René van den Bedem’s post on “VCDX – Recoverability impacting Availability Explained”
Without further ado, the podcast recording can be found here:
I recently ran into an issue with the vCenter Server Appliance (VCSA) 6.5 installer. When I proceeded to Step 5, “Set up appliance VM” I received the error:
“A problem occurred while reading the OVF file…Error: ovftool is not available.”
After some research, it turns out that macOS Sierra (10.12.x) is not supported and, of course, that is the operating system of my laptop. I found a blog post from Emad Younis that outlines two possible options for working around this error.
I tried both options. Option 1 did not work for me, but Option 2 did. I’d like to take a minute and demonstrate step-by-step what I did to proceed with the VCSA deployment.
On the deployment wizard error, I selected Installer log.
Quickly read through the log and find the error regarding the ovftoolCmd, it will state the directory that the installer is searching for the tool set. Copy that directory, sans /vcsa/ovftool/mac/ovftool.
Launch the Terminal utility and type the open command for Finder to open that directory.
As mentioned before, leave off everything from /vcsa/ and on.
When that directory opens in Finder, you’ll notice that is it empty…therein lies the problem!
Copy the vcsa folder into this directory.
Once the vcsa folder has successfully copied, you should be able to go back to the macOS installer, press Back, and then hit Next to go back to Step 5.
You should now be able to select the deployment size options and successfully proceed with the VCSA deployment.
App Volumes uses a provisioning machine to capture applications in order to create AppStacks. According to the App Volumes User Guide, “the provisioning of AppStacks must be performed on a clean base image…”
In my opinion, a “clean base image” implies that this machine is not domain joined and therefore not inheriting any group policies.
In earlier versions of App Volumes, there was an option when initially configuring or later reconfiguring App Volumes’ Active Directory integration to “Allow non-domain entities.” This is an option that I always selected in order to have a non-domain joined provisioning machine.
However, now in App Volumes 2.12, that option is no longer available.
I’ve yet to figure out an option to bypass having the provisioning machine on the domain. And there’s no mention of this in the release notes.
As if 2016 weren’t bad enough…this year is going to be slightly longer than normal. New Year’s Eve will be one second longer in 2016 to adjust for the shifting rotation of the Earth.
A leap second is a one-second adjustment that is sometimes applied to Coordinated Universal Time (UTC) in order to keep its time of day close to the mean solar time, or UT1.
This leap second has the potential to cause chaos for IT systems that cannot deal with a 61-second minute. Websites such as Reddit, Yelp, LinkedIn have previously experienced outages for a period of time due to the leap second in 2012.
Most VMware products are unaffected by this time change that will occur this weekend However, some products are affected. Please see KB 2147498 for more information.
For those VMware products affected, the common work-around is to enabled Slew Mode for NTP. For more information see KB 2121016.
Nothing is more fun than walking into a client site on a Monday morning and something that’s supposed to be easy (installing Horizon Agent in base image) doesn’t work.
I logged into the Windows 7 virtual desktop image and tried to install the Horizon Agent, however, I received a message stating: “The system must be rebooted before installation can continue.” Seemed simple enough, so I restarted the machine, and tried again. Same error. #facedesk
Did some digging and found an old KB (1029288). The KB doesn’t say that it is applicable to Horizon View 7.0.x but it solved the issue I was having.
First I tried to uninstall and re-install VMware Tools. No luck.
I went through the registry keys suggested by the aforementioned KB but there weren’t any associated strings associated with the registry keys.
At the very end of the list, two registry keys were listed:
There were values located in HKLM\Software\Microsoft\Windows\CurrentVersion\RunOnce, so I deleted all the values, rebooted the machine.
Voilà! I was finally able to get the Horizon Agent to install so I could proceed with my day. It appeared that there was a previously failed installation that was preventing the Horizon Agent from launching its own installer.
When provisioning Horizon 7 Instant Clones, you may have noticed some new folders that were created in the VM and Template view in the vSphere Web Client.
Each of these folders has a specific purpose for Instant Clones:
- cp-template-xxxx – Virtual machine that is a template used to create Instant Clones; this is created from the master image.
- cp-parent-xxxx – These virtual machines exist in a 1:1 relationship to the number of ESXi hosts in the cluster. I have a four node cluster, therefore I have 4 clone prep parent virtual machines. Each ESXi host has one of these powered on and in memory in order to provision the Instant Clone VMs.
- cp-replica-xxxx – This virtual machine is used to create the clone prep parent virtual machines. It will be also used as necessary to provision additional clone prep parent virtual machines.
- If the Instant Clones are updated with a new image, a virtual machine will be created here for staging purposes.