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by Duncan Epping

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horizon

VSAN Healthcheck: Read Cache Reservations test failed

Duncan Epping · Jul 26, 2016 ·

** Please note: this has been solved in vSAN/vSphere 6.5GA and 6.0 p04 **

I’ve seen this popping up a bunch of times now, and it seems that the problem and solution is not easy to find for people so I thought I would give it a try as well. When running VSAN all-flash and Horizon View it can happen that you see a failed test for Read Cache Reservations in the VSAN Healthcheck. The reason for this failed test is simple: you are using read cache reservations but All-Flash has no read cache. So this is why the read cache reservations test failed. You can see the error below.

The solution is even easier, you change the policy that you are using on those objects. Change the policy to state 0% read cache and apply this policy to all objects! When applied you click “retest” on the Healthcheck and the error should go away. If you want to know more about Horizon View and policies make sure to read Cormac’s post here. There is also a KB on this topic, which can be found here.

VMware documentation in epub / mobi format?

Duncan Epping · Jun 3, 2011 ·

I just noticed that the Horizon documentation is offered in epub and mobi format. I have been told that this is the first of many more docs to be released in this more universal format. I am happy that VMware decided to adopt this format. It does lead to another question though. I am part of tech marketing and we produce a lot of collateral. Some documents are fairly lengthy and I always have the feeling that many people won’t read docs which are more than 50 pages. Is this any different with epub/mobi? Would you say that these formats enhance readability? If not, what would be a good way of offering documents of between 50 – 150 pages?

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About the author

Duncan Epping is a Chief Technologist in the Office of CTO of the Cloud Platform BU at VMware. He is a VCDX (# 007), the author of the "vSAN Deep Dive", the “vSphere Clustering Technical Deep Dive” series, and the host of the "Unexplored Territory" podcast.

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