vSphere 4.1 HA/DRS Deepdive promo was a huge hit!

Thanks to each and everyone of you who took the time to download the vSphere 4.1 HA/DRS Deepdive kindle copy during our promo days. Over 6000 downloads in just 2 days is nothing short of amazing. Frank and I were talking about this promo opportunity a week ago for the 4.1 book and never anticipated on these kind of numbers. We expected a couple of hundred copies to be given away, maybe close to a 1000, but definitely not 6000+. Just some facts about this promo:

  • 175+ retweets of my tweets
  • 600+ tweets
  • 30.000+ people reached
  • 6000+ Kindle copies

We were shocked, we anticipated on a couple of hundred copies, maybe close to a 1000, but never did we anticipate on 6000 kindle copies being downloaded. Thanks to everyone who helped driving this. All the tweets / facebook and G+ mentions helped with this huge success.


How do I use das.isolationaddress[x]?

Recently I received a question on twitter how the vSphere HA advanced option “das.isolationaddress” should be used. This setting is used when there is the desire or a requirement to specify an additional isolation address. The isolation address is used by a host which “believes” it is isolated. In other words, if a host isn’t receiving heartbeats anymore it pings the isolation address to validate if it still has network access or not. If it does still have network access (response from isolation address) then no action is taken, if the isolation address does not respond then the “isolation response” is triggered.

Out of the box the “default gateway” is used as an isolation address. In most cases it is recommended to specify at least one extra isolation address. This would be done as follows:

  • Right click your vSphere Cluster and select “Edit settings”
  • Go to the vSphere HA section and click “Advanced options”
  • Add “das.isolationaddress0″ under the option column
  • And add the “IP Address” of the device you want to use as an isolation address under the value column

Now if you want to specify a second isolation address you should add “das.isolationaddress1″. In total 10 isolation addresses will be used (0 – 9). Keep in mind that all of these will be pinged in parallel! Many seem to be under the impression that this happens sequential, but that is not the case!

Now if for whatever reason the default gateway should not be used you could disable this by adding the “das.usedefaultisolationaddress” to “false”. A usecase for this would be when the default gateway is a “non-pingable” device, in most scenarios it is not needed though to use “das.usedefaultisolationaddress”.

I hope this helps when implementing your cluster,

Want a free Kindle version of the VMware vSphere 4.1 HA and DRS technical deepdive?

Just a limited offer, two days only… The VMware vSphere 4.1 HA and DRS tech deepdive is free. WHAT? Yes it is free… $ 0,-. So hop over to amazon and pick up your free Kindle copy today!

For those who have been living under a rock, this book will explain the ins and outs of both vSphere HA and DRS. Admission Control, Resource Pools, Limits, HA Restart Timelines… it is all in there. Pick it up!

vSphere Metro Storage Cluster white paper released!

I wanted to point you guys to a white paper that I have worked on for the last months. This white paper was written in collaboration with Lee Dilworth, Ken Werneburg, Frank Denneman and Stuart Hardman. Thanks guys for taking time out of your busy schedule to work with me on this project! This white paper is about vSphere Metro Storage Cluster solutions (aka stretched clusters) and specifically looks at things from a VMware perspective. Enjoy!

  • VMware vSphere Metro Storage Cluster (VMware vMSC) is a new configuration within the VMware Hardware Compatibility List. This type of configuration is commonly referred to as a stretched storage cluster or metro storage cluster. It is implemented in environments where disaster/downtime avoidance is a key requirement. This case study was developed to provide additional insight and information regarding operation of a VMware vMSC infrastructure in conjunction with VMware vSphere. This paper will explain how vSphere handles specific failure scenarios and will discuss various design considerations and operational procedures.