Back in the days when Servers still had 8GB or 16GB memory at most a setting was introduced that guaranteed the hypervisor had a certain amount of free memory to its disposal. The main purpose of this being of course stability of the system. As with any Operating System free memory is desirable to ensure it is available whenever a [...]

After 14 emails with absolutely no reply whatsoever our book, vSphere 4.1 HA and DRS Technical Deepdive, popped up on both the German and UK version of Amazon. For those who haven’t ordered it yet through comcol.nl you can also get it here: Amazon.de Amazon.co.uk Sorry about the delay and I hope they will continue selling it for a very [...]

Well depending on what type of queues we are talking about of course, but in general no one likes queues. We are however confronted with queues on a daily basis, especially in compute environments. I was having a discussing with an engineer around storage queues and he sent me the following which I thought was worth sharing as it gives [...]

Last week a customer asked me a question about how to respond to for instance a partial failure in their SAN environment. A while back I had a similar question from one of my other customers so I more or less knew where to look, and I actually already blogged about this over a year ago when I was showing [...]

I blogged about this almost two months ago and just on Luc’s blog that the release date has been set and the cover art was released. I wanted to remind all of you the book that is one of a kind, VMware vSphere PowerCLI Reference: Automating vSphere. Release date: 28th of March Authors: Luc Dekens, Alan Renouf, Glen Sizemore, Arnim [...]

I was just answering some questions on the VMTN forum when someone asked the following question: Should I upgrade our VMFS luns from 3.21 (some in 3.31) to 3.46 ? What benefits will we get? This person was referred to an article by Frank Brix Pedersen who states the following: Ever since ESX3.0 we have used the VMFS3 filesystem and [...]

Last week I wrote about the different datamovers being used when a Storage vMotion is initiated and the destination VMFS volume has a different blocksize as the source VMFS volume. Not only will it make a difference in terms of reclaiming zero space, but as mentioned it also makes a different in performance. The question that always arises is how [...]