Why does a vSAN cluster need slack space?

I usually get a lot of questions during trainings or in the process of vSAN designs. People ask me why there is a requirement for 30% of slack space in a vSAN cluster. If you look at it without going deeper, it looks like a waste of (expensive) resources. Especially with all-flash clusters it’s a strong cost factor. Often this slack space is mistaken as growth reserve. But that’s wrong. By no means it’s a reserve for future growth. On the contrary – it is a short term allocation space, needed by the vSAN cluster for rearrangements during storage policy changes.

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Only a few days until VeeamON virtual 2019

The date of Veeam ON Virtual 2019 is getting closer. On November 20th this online conference will happen right on your desktop. Leading market experts and Veeam technical professionals will present latest trends and innovations.

Save your seat today and register for the event. You can find details on the registration page or on my recent blogpost about VeeamON Virtual.

Follow hashtag #VeeamONVirtual on Twitter to get latest news.

VMworld spotlight – ESXi on ARM

In 2018 at VMworld US Pat Gelsinger and Ray O’Farrell gave an outlook on how Edge and IoT devices could benefit from virtualization. A live demo showed a mission critical application in a wind turbine. So far nothing special – except for the fact that the two ESXi hosts were running on ARM architecture.

Running ESXi on ARM opens a range of new possibilities. For example running it on a Raspberry Pi.

This year at VMworld Europe 2019 ESXi on ARM had a dedicated booth to show what is possible and gave potential use cases with ESXi on ARM architecture.

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VMworld spotlight – Stickers

Bloggers love stickers. It becomes obvious if you take a look at their sticker plastered notebooks.

I don’t know where this tradition comes from. Maybe to cover up boring vendor logos.
Whatever. If you attend VMworld, the best spot to complete your personal sticker collection is the blogging area at VMTN. Within 4 days a pile of stickers, pins and other collectibles will grow in the center of the desk.

This year Kubernetes and Tanzu stickers were most popular, but also VMUG stickers from all over the world. The sticker pile works a bit like a geo cache. You take something out and you put something in (if you have). It’s also a good source for VMUG leaders to supply their local meetings with new stickers.