VSAN: the performance impact of extra nodes versus failure

This post makes more sense if you know the background. Therefore please read this Reddit post where an early adopter had an issue with VSAN. Basically after a node failure in a 3-node configuration, the rebuild to a 4th node brought the whole cluster to its knees. Important to note: there was absolutely no data loss, just a whole environment that went down while rebuilding. For my take on the reasons and a few design tips, go to end of post 🙂 One of the comments I and a lot of other people had was that a 4-node cluster would

Continue reading »

Say nay to the naysayers – serverside storage for believers

DISCLAIMER: I am currently working on a Marketing project for ScaleComputing, one of the players in the HyperConverged platform market. The heat is on! That’s the least you can say about datacenter marketexture. There are two big trends going on in the datacenter design:  on the logical side we are drastically changing from a client-server age to cloud-computing age (or however we are going to call this era in 10 years time). on the physical side we are drastically changing from a silo-design to a node-based design. this goes hand in hand with the ‘software-defined’ trend Most of you know

Continue reading »

The Economics of VSAN – it’s all in the design

Thank you for everyone that got in touch after my “Is VSAN affordable” post of a few days ago. I have enough new thoughts to give the post the extent it deserves and share a few new thoughts/questions. First of all it has become pretty clear that my assumptions that the VSAN VDImark benchmark was CPU constraint appeared to be correct. The only true conclusion we can make from the original VMware post is that VSAN in G.A. has more CPU reduction than in beta which made them able to run about 5% more VDI seats on the same CPU’s.

Continue reading »

is VSAN more affordable?

I was very pleased to see actual results coming on the VMware blog concerning VSAN 5.5 GA benchmarks in the lab. First of all please read the blogpost first before going to my analysis/questions. Secondly if you are looking for answers, this is not going to be the place as I am just going to ask more questions. That being said let’s have a look at the actual results. If we simplify the results of the benchmark these are the finding: VSAN does scale lineair, up to 1600 heavy duty VDI’s on a 16-node cluster response times scale linear as

Continue reading »