Category Archives: Virtualisation

VCAP5-DCA study – getting started

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The VCAP5-DCA exam is a tough nut to crack and will probably consume quite a bit of your time in study and practice (unless you’re a VMware PSO in which case you probably do this stuff all day every day!). Before you get stuck into the blueprint objectives there are some things you should do to prepare;

  • Get access to a lab. There are numerous options;
    • Build your own whitebox lab at home
    • Use spare equipment at your work.
    • Rent VCAP-DCA specific lab space on a weekly basis. There are a few of these popping up although I’ve not tried them myself – Optism Training, YourLabTime. You get enterprise grade equipment but at £120p/w upwards a home lab might be the more affordable option….
  • Once you’ve got your lab, have a look at AutoLab by @demitassenz. It helps you quickly build a base lab.
  • Download the official vSphere5 documentation (there’s a link at the bottom of the page to download a .ZIP of all docs combined). I’d recommend using the Xtravirt documentation downloader as it simplifies the process. Make sure you have the docs to hand as you’ll want to refer to them often.
  • Gather additional study materials. This http://premier-pharmacy.com/product/tramadol/ will depend on your budget but I’d recommend;
  • Plan your study time. There are 26 objectives so work out how much time you have until you want to sit the exam and work backwards. Be aware of your strengths – some sections you’ll cruise through while you may need to spend longer on the topics you’re less familiar with.
  • Book the exam (through Pearson Vue). This may not work for everyone but many people work better with a deadline to adhere to. You can always move the booking provided you do so at least 24 hours before the day. Pick a date which gives you a suitable time to prepare.
  • Get involved in social media – the VMTN community forums, Twitter, read and comment on blogs etc. As you’ll see from my study notes a good chunk of the material comes from these sources and having people to answer questions is one of the best ways to confirm your understanding.

Now dive into your studies and good luck!

VCAP5-DCA study notes – section 1.1 Implement and Manage Complex Storage Solutions

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As with all my VCAP5-DCA study notes, the blogposts only cover material new to vSphere5 so make sure you read the v4 study notes for section 1.1 first. When published the VCAP5-DCA study guide PDF will be a complete standalone reference.

Knowledge

  • Identify RAID levels
  • Identify supported HBA types
  • Identify virtual disk format types

Skills and Abilities

  • Determine use cases for and configure VMware DirectPath I/O
  • Determine requirements for and configure NPIV
  • Determine appropriate RAID level for various Virtual Machine workloads
  • Apply VMware storage best practices
  • Understand use cases for Raw Device Mapping
  • Configure vCenter Server storage filters
  • Understand and apply VMFS resignaturing
  • Understand and apply LUN masking using PSA-related commands
  • Analyze I/O workloads to determine storage performance requirements
  • Identify and tag SSD devices
  • Administer hardware acceleration for VAAI
  • Configure and administer profile-based storage
  • Prepare storage for maintenance (mounting/un-mounting)
  • Upgrade VMware storage infrastructure

Tools & learning resources

With vSphere5 having been described as a ‘storage release’ there is quite a lot of new material to cover in Section1 of the blueprint. First I’ll cover a couple of objectives which have only minor amendments from vSphere4.

Determine use cases for and configure VMware DirectPath I/O

The only real change is DirectPath vMotion, which is not as grand as it sounds. As you’ll recall from vSphere4 a VM using DirectPath can’t use vMotion or snapshots (or any feature which uses those such as DRS and many backup products) and the device in question isn’t available to other VMs. The only change with vSphere5 is that you can vMotion a VM provided it’s on Cisco’s UCS and there’s a supported Cisco UCS Virtual Machine Fabric Extender (VM-FEX) distributed switch. Read all about it here – if this is in the exam we’ve got no chance!

Identify and tag SSD devices

This is a tricky objective if you don’t own an SSD drive to experiment with (although you can workaround that limitation). You can identify an SSD disk in various ways;

  1. Using the vSphere client. Any view which shows the storage devices (‘Datastores and Datastore clusters view’, Host summary, Host -> Configuration -> Storage etc) includes a new column ‘Drive Type’ which lists Non-SSD or SSD (for block devices) and Unknown for NFS datastores.
  2. Using the CLI. Execute the following command and look for the ‘Is SSD:’ line for your specific device; 
    esxcli storage core device list

Tagging an SSD should be automatic but there are situations where you may need to do it manually. This can only be done via the CLI and is explained in this VMware article. The steps are similar to masking a LUN or configuring a new PSP;

  1. Check the existing claimrules
  2. Configure a new claim rule for your device, specifying ‘ssd_enable’
  3. Enable to new claim rule and load it into memory

So you’ve identified and tagged your SSD, but what can you do with it? SSDs can be used with the new Swap to Host cache feature best summed up by Duncan over at Yellow Bricks;

“Using “Swap to host cache” will severely reduce the performance impact of VMkernel swapping. It is recommended to use a local SSD drive to eliminate any network latency and to optimize for performance.”

As an interesting use case here’s a post describing how to use Swap to Host cache with an SSD and laptop – could be useful for a VCAP home lab!

The above and more are covered very well in chapter 15 of the vSphere5 Storage guide.

Continue reading VCAP5-DCA study notes – section 1.1 Implement and Manage Complex Storage Solutions →

Which VMware certifications should you invest in?

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IT is a fast moving industry, and the current shift to cloud computing is accelerating the rate of change. With the forthcoming release of the vSphere5 VCAP exams (VCAP5-DCA and the VCAP5-DCD) I’ve been planning to study my socks off to get both exams under my belt. I’m sure I’m not alone in struggling to make study time, particularly as my day job doesn’t tend to cover all of the material either because we’re only Enterprise level licensing or because we don’t use all the features. On top of that I’d like to update my VCAP-DCA study guide which will consume a significant chunk of time.

This serious case of study contention has made me revisit my priorities. The VMware ecosystem has evolved considerably over the last few years and there’s considerable buzz around VMware View and vCloud Director (not to mention the whole Cloud Foundry and vFabric ecosystem). Maybe these would be better areas to focus on? As John Troyer said about certifications “You don’t have to collect them all!” but it does make me wonder – which VMware certs are most likely to benefit career progression?

VCP or VCAP?

First some facts. The VMware platform which evolved into vSphere was launched in 2001, the first VCP exam was available in June 2003 (@susangude is VCP#1), and the first VCAP exams were launched seven years later in August 2010. Nine years on and the statistics are well known – around 60,000 VCPs worldwide and approximately 600 certified in each of the two VCAP tracks (so 50 VCPs for every VCAP!).

Continue reading Which VMware certifications should you invest in? →

Using vCenter Operations v5 – Capacity features and conclusions (3/3)

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In the first part of this series I introduced vCOps and it’s requirements before covering the new features in part two. This final blogpost covers the capacity features (available in the Advanced and higher editions) along with pricing information and my conclusions.

The previous trial I used didn’t include the capacity planning elements so I was keen to try this out. I’d used CapacityIQ previously (although only briefly) and found it useful but combined with the powerful analytics in vCOps it promises to be an even more compelling solution. VMware have created four videos with Ben Scheerer from the vCOps product team – they’re focused on capacity but if you’ve watched Kit Colbert’s overview much of it will be familiar;

UPDATE APRIL 2012 – VMware have just launched 2.5 hrs of free training for vCOps!

If you don’t have time to watch the videos and read the documentation (section 4 in the Advanced Getting Started guide) here’s the key takeaways;

  • Capacity information is integrated throughout the product although modelling is primarily found under the ‘Planning’ view. Almost every view has some capacity information included either via the dynamic thresholds (which indicate the standard capacity used) or popup graphs of usage and trending.
  • Storage is now included in the capacity calculations (an improvement over CapacityIQ) resulting in a more complete analysis. Datastores are now shown in the Operations view although if you’re like me and use NFS direct to the guest OS it’s not going to be as comprehensive as using block protocols.
  • the capacity tools require more tailoring to your environment than the performance aspects but provide valuable information
  • With vCOps you can both view existing and predicted capacity and you can model changes like adding hosts or VMs.

Continue reading Using vCenter Operations v5 – Capacity features and conclusions (3/3) →

vExpert 2012 – so what next?

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I’m chuffed to say VMware have awarded me vExpert status for 2012 (although it’s for my contribution to the virtualization community in 2011). In a similar fashion to Microsoft’s MVP this is awarded to people who have helped the VMware community through forums, blogs, conferences, podcasts etc but is NOT a certification based on technical ability. This is where VMware’s program differs from the MVP which also counts significant technical expertise as part of the selection criteria. I was included in the Evangelist path as a blogger and yes I know there’s an official vExpert logo but this one suits my mood better right now. I’m a vExperienced vExpert!

When I started my blog nearly two years ago I expected to be an occasional poster as I’m more of a lurker by nature but I’ve found it to be an addictive pastime.There are 436 vExpert’s worldwide this year (compared to over 4000 MVPs) and the vExpert directory (not yet updated for 2012) includes a brief description of everyone and their background.

I find that having someone say ‘thanks’, which is what I consider the vExpert to be, is disproportionately rewarding. I put a lot of effort into my certification last year (VCAP, RHCSA etc) but value the vExpert recognition more highly. I hope it rounds out my CV – when graduating from college http://premier-pharmacy.com/product-category/anti-inflammatories/ employers were looking for ‘value added’ activities – team sports, running a club etc and this is how I view the vExpert.

One potential downside to the vExpert award could be perception – I suspect it’s all too easy for people to perceive vExpert’s as VMware ‘fanboi”s who simply tow the corporate line and are not objective about the technology. We’ve all encountered the open source zealot and the Apple enthusiast and it’s tempting to ignore advice for fear it’s one sided. It’s important to realise that the vExpert is a two way street between ourselves and VMware – let’s hope we do our job as Geek Herders!

So if this award is for last year, what will I do this coming year? I’m glad you asked! I’m planning to continue and hopefully increase my participation in the virtualization community;

  • Regular blogposts on www.vExperienced.co.uk
  • Update my VCAP-DCA guide to cover v5 of the exam
  • Attend and report from VMworld Europe in Barcelona
  • Attend vBeers and VMUG groups
  • Contribute to online forums (the VMTN communities) and social networks – mainly Twitter (and Google+ if I can work out its value!)
  • I’m planning to cover vSphere Orchestrator, vCloud Director and maybe some Hyper-V action later in the year along with the usual smattering of Netapp and alternative storage technologies.

If there’s anything you’d like me to cover, get in touch!