Our new book, the vSphere HA and DRS technical deepdive is available on CreateSpace and Early this year Duncan. VMware vSphere HA and DRS Technical Deepdive zooms in on two key components of every VMware based infrastructure and is by no means a “how to” . pages. Dimensions: in. x in. x. vSphere 4. 1 HA and DRS Technical Deepdive zooms in on two key components of every VMware based.

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vCenter High Availability Deep Dive – Part 1 – VMware vSphere Blog

David can be found blogging at http: This means that every time you upgrade, replace certificates, or need to re-deploy the VCHA cluster you will techniacl to tear down and manually clone technnical VMs, move them to where they need to run, resize the Witness, and re-setup all the DRS rules. Thanks, Eric Sloof received a proof copy of the book and shot a video about it. The Resource Management Guide also contains a wealth of info on resource pools and this should be your starting place!

This is evidenced by the fact that VCHA only protects vCenter Server and not the workloads or hosts being managed by it. If however there are not enough resources available it will not power on this VM.

This topic is probably the one I spend the most time on when talking with customers. Excellant news on technial book. The one exception is if you happen to have a third site which has stretched L2 from the other two sites. More resources for migrated VM as it moves qnd a less utilized host Benefit: In his role, he covers vSphere Lifecycle.


As said every 5 minutes DRS will calculate the sum of the resource entitlements of all virtual machines on a single host and divides that number by the capacity of the host:.

I think, in hindsight, it may have been better to call these Automated Basic and Manual Advanced. If h is lightly loaded compared to Source Host: At least not 30 days.

HA Deepdive

When deploying VCHA try to use the Basic workflow when at all possible to make the solution tedhnical to maintain and deploy. It includes obscure and subtle knowledge; there are definitely some eye-openers in there e. DRS uses the following procedure: Load balancing VMs due to imbalanced Cluster VM Placement when booting I will not be focusing on Resource Pools at all as I feel that there are already more than enough articles which explain these.

DRS does not take limits or reservations into account. The formula mentioned in the KB article followed by an example based on the screenshot fig1: Before discussing the contents of the book I would like take the opportunity deepdivs thank our technical reviewers for their time, their wisdom and their input: This is the description of the book that is up on CreateSpace:.

This is absolutely false. The A record for vCenter Server is controlled by whatever DNS service is being used in your environment and event if you can automate the updating of that A record to the new IP address there is still the real possibility that there will be transient issues due to the DNS TTL, propagation, and caching.

Great news on the book. This should result in a migration which gives the most improvement in terms of cluster balance, in other words: Duncan is the owner of Yellow-Bricks. There does happen to be one scenario where I think splitting the VCHA nodes across different sites can work, though.


The book should ddepdive be available e-reader format epub or kindle for those that have invested in e-readers or just find it more convenient to download the file. Cluster Balance Risk Analysis Stable vs unstable workload of the VM historic info used Based dgs these consideration a cost-benefit-risk metric will be calculated and if this has an acceptable value the VM will be consider for migration.

For each VM check if a VMotion to each of the hosts which are less utilized than source host would result in a less imbalanced cluster and meets the Cost Benefit and Risk Analysis criteria.

Techbical of the most common questions we get and misconceptions I hear about is that in order to get all the features of VCHA you need to deploy using the Advanced workflow.

Of course the obvious question was when the DRS Deepdive would be posted. In fact, VCHA is exactly the same regardless of how it is deployed. The in-depth discussions we had are without a doubt the most difficult I have ever experienced and were very interesting, both most of all fun!

During QA we ordered several proof copies. It seems to be a separate identity…. The actual algorithm being used to determine this is described in this KB article.

So it seems that the book will be available on amazon.