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by Duncan Epping

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A price winners view on VMworld…. (by Jason C)

Duncan Epping · Oct 27, 2010 ·

When I entered the competition on yellow-bricks, I showed a list of the sessions and labs I would like to do as my reason for going. I think it is only fair to show what I actually did whilst I was there. I was able to do the majority of the breakout sessions I wanted to and all the labs I hoped to complete. You do need to remain flexible on the breakout sessions some clash with each other and others fill up quick so you may not get a seat thankfully all the breakouts are recorded so can be viewed later.

ESXi / Performance / Troubleshooting and storage
SS8222 Transitioning to ESXi, Architecture for Next-Generation vSphere
TA6720 Troubleshooting using ESXTOP for Advanced Users
TA7171 Performance Best Practices for vSphere
TA8129 A Beginner’s Guide to Performance Troubleshooting with vSphere
TA8133 Best Practices to Increase Availability and Throughput for VMware
LAB23 VMware ESXi Remote Management Utilities
LAB24 VMware vSphere™ Performance & Tuning
LAB25 VMware vSphere™ Troubleshooting*
TA7805 Tech Preview: Storage DRS
Group Discussion Storage with Chad Sakac
Group Discussion Storage Performance with Scott Drummonds

SRM
LAB11 VMware vCenter™ Site Recovery Manager—Basic Install & Config
LAB12 VMware vCenter™ Site Recovery Manager— Extended Config & Troubleshooting
BC6703 How To Be Successful with SRM Implementations
BC7773 VMware Site Recovery Manager: Misconceptions and Misconfigurations

Just for fun:
LAB13 VMware vCloud Director—Install & Config (Had to see what it was all about)
LAB17 VMware vCenter™ Orchestrator (Hidden Gem)
LAB20 VMware vCenter™ vShield
LAB26 VMware vSphere™ PowerCLI (Yes still trying to get the hang of it Alan)

I enjoyed the group discussions they came as a bit of a surprise as I did not see them on the schedule originally. Groups of 20-30 people led by industry leaders answering a selection of multiple choice questions in a specific area with an open discussion about the answers. Unfortunately not all these were taped which I think is a shame as I am sure many would find them useful.

When I met Duncan he said try to focus on one thing to write about from a technical view if you can. Slight problem I found at least one thing in each breakout session , lab or discussions that I have written down to take away. Not sure where to begin I was hoping to review the recordings to check what might be most useful. In a way I’d like to talk about it all but that could take more than one article. Talking of the breakout session I found every single one informative and well presented.

Most of you have already read other articles on the labs and I guess there is not much more for me to add. I never had to queue though I did tend to get there first thing. They were well organised and generally easy to follow with plenty of time. Two screen set up one for working on and one for following the instructions. Like others I thought it would be nice to have access to them outside the event, not sure how they would have worked though on my laptop in practice.

One of the things that I wanted to call out which is not on the agenda is having the ability to chat with your peers, listen to other people’s thoughts. Have the ability to talk through your thoughts and ideas, see if they make sense and receive constructive feedback. This on its own is priceless.

The solutions exchange is an experience by itself and as it was my first time a pleasant one at that. Though when the same company scanned me every day I was starting to wonder what the heck is going on. It is in the solutions exchange where I think I found my one thing , I had a chance to play with the EMC hands on labs just the Unisphere bit and VAAI. Very impressed with Unisphere can’t wait to upgrade the EMC Clariion planned for after New Year going to make my job so much easier. Talking about VAAI, wow what a difference a clone of a 20GB VM was 5 times quicker using VAAI, I was impressed!

So what’s that one topic Duncan told me to pick…. drum roll please…. STORAGE ….. It seems to be a recurring theme one way or the other in every session. Started to think about the most difficult thing for me to manage and measure performance of and it is again storage.

Quote from one of the sessions:

most performance issues related to storage

Another quote which interested me was the following:

What does the amateur do find the VMFS volume with the most space and put the new VM on that storage.

Guilty as charged. I am that amateur, but than again in my defense if the people developing these apps or services could give me any indication of the IO and its profile I would eat my hat.

But wait there is a savior on the horizon did you see ” TA7805 Tech Preview: Storage DRS”? I have searched for people talking about this after VMworld but have not found much. For me hands down the most important thing discussed at VMworld. If I could have one wish for the next version on vSphere this would be it, ideally on the Enterprise sku at the very highest that would be great. The presentation was given by the same engineer who talked about SIOC last year so I have high hopes for it being included in the next version.

It does what it says on the tin, DRS for storage.

  1. Helps with virtual disk placement
  2. Load balances IO
  3. Takes care of Out of space issues.
  4. Monitors over time so if VM’s get hotter they can be moved
  5. Data store maintenance auto move VM’s to maintain balance.
  6. Add data stores move VM’s

One caveat I foresee, I hope they speak to the SRM team as I know SRM is not to happy when you go around moving the data store a VM is stored on.

In conclusion would I go again? Absolutely! I may have to pay for it myself but I reckon I can do it all for less than the cost of a 3 day training course and it is a worthwhile investment, both for myself and for the council. I have already started to apply some of the knowledge gained from the sessions I went to back at work. It is a gift that keeps on giving as I now have access to 170 hours worth of VMworld 2010 sessions to look at over the coming year.

Last thing I promise. Did you know you can now get access to all the sessions from 2009 for free? Me neither but you can and some of them are pretty much the same as this years from what I have seen especially the esxtop and performance. I think there is something in there for everyone. You do have to register but let me say again they are free so go Enjoy…

http://www.vmworld.com/community/sessions/

To Duncan, VMware, the Bella Centre and the wonderful City of Copenhagen.

Until next time, Tak for alt.

Jason C

Did you know? SCSI Reservations…

Duncan Epping · Oct 26, 2010 ·

Today we had an interesting discussion on the VCDX mailing list. One thing I noticed a while back when I was randomly looking around in “esxtop” was a new field. The field is called ” RESVSTATS and can be enabled in all disk related displays(d, u,v).

esxtop performance reservations scsi

This will make troubleshooting storage related performance issues a bit easier as the SCSI Reservations(RESV/S) are shown a column(click the screenshot for a larger version) when enabled, and even more specifically SCSI Reservation Conflicts (CONS) are shown next to it):

Did you know? All hosts failed…

Duncan Epping · Oct 22, 2010 ·

** for vSphere 5.0 check this update! **

Today I received a very valid question around a full cluster failure. What happens when all the hosts in a cluster go down and at some point return? Will the VMs be restarted and what do I need to have in place to ensure they will?

It seems to be an urban myth that you need to use “auto-start” for a full cluster failure. But as you might have noticed that won’t work when HA is enabled. So what will?

VMware HA

Is it really that simple? Yes it is! When a full cluster fails and nodes start powering up HA will restart the VMs. As you know HA (or to be precise the primary nodes) maintains the host states, which includes the status of all VMs on those hosts. When one of the primary nodes returns to duty it will trigger the restarts based on the last known state. Make sure you set the restart priority correct so that any VMs hosting “management apps” will be booted up first.

It can’t get any simpler than that can it!

HA, the missing link…

Duncan Epping · Oct 20, 2010 ·

One of the things that has always been missing from VMware’s High Availability solution stack is application awareness. As I explained in one of my earlier posts this is something that VMware is actively working on. Instead of creating a full App clustering level VMware decided to extend “VM Monitoring” and created an API to enable App level resiliency.

At VMworld I briefly sat down with Tom Stephens who is part of the Technical Marketing Team as an expert on HA and of course the recently introduced App Monitoring. Tom explained me what App Monitoring enables our partners to do and he used Symantec as the example. Symantec monitors the Application and all its associated services and ensure appropriate action is taken depending on the type of failure. Now keep in mind, it is still a single node so in case of OS maintenance their will be a short downtime. However, I personally feel that this does bridge a gap, this could add that extra 9 and that extra level of assurance your customer needs for his tier-1 app.

Not only will it react to a failover, but it also ensures for instance that all service are stopped and started in the correct order if and when needed. Now think about that for a second, you are doing maintenance during the weekend and need to reboot some of the Application Servers which are owned by someone else. This feature would enable you to reboot the machine and guarantee that the App will be started correctly as it knows the dependencies!

Tom recently published a great article about this new HA functionality and the key benefits of it, make sure you read it on the VMware Uptime blog!

Storage IO Control Best Practices

Duncan Epping · Oct 19, 2010 ·

After attending Irfan Ahmad’s session on Storage IO Control at VMworld I had the pleasure to sit down with Irfan and discuss SIOC. Irfan was so kind to review my SIOC articles(1, 2) and we discussed a couple of other things as well. The discussion and the Storage IO Control session contained some real gems and before my brain resets itself I wanted to have these documented.

Storage IO Control Best Practices:

  • Enable Storage IO Control on all datastores
  • Avoid external access for SIOC enabled datastores
    • To avoid any interference SIOC will stop throttling, more info here.
  • When multiple datastores share the same set of spindles ensure all have SIOC enabled with comparable settings and all have sioc enabled.
  • Change latency threshold based on used storage media type:
    • For FC storage the recommended latency threshold is  20 – 30 MS
    • For SAS storage the recommended latency threshold is  20 – 30 MS
    • For SATA storage the recommended latency threshold is 30 – 50 MS
    • For SSD storage the recommended latency threshold is 15 – 20 MS
  • Define a limit per VM for IOPS to avoid a single VM flooding the array
    • For instance limit the amount of IOPS per VM to a 1000
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About the Author

Duncan Epping is a Chief Technologist and Distinguished Engineering Architect at Broadcom. Besides writing on Yellow-Bricks, Duncan is the co-author of the vSAN Deep Dive and the vSphere Clustering Deep Dive book series. Duncan is also the host of the Unexplored Territory Podcast.

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