During the week I was at a customer site that is using vSAN 6.2 as foundation for their upcoming virtual desktop infrastructure (Seems like 2016 is really really the year of the VDI). I love vSAN and believe that at the moment it’s a great fit for many dedicated use-cases within the virtualization field.
During some load- & failover tests of the vSAN installation I realized something regarding the IO-queues within the vSAN-stack and to be honest, I am not quiet sure what the risks, mitigations and therefore the correct actions are.
We open a VMware ticket in parallel, but if you have any more in-depth knowledge about this topic, please let me know since this might be interesting to more of people (since the number of vSAN implementations is increasing).
Since the integration of flash/SSD in the performance/cache tier of vSAN the performance is great compared to classical HDD-based solutions.
To ensure a good performance level Duncan Epping and Cormac Hogan talked about the queuing topics within some blog posts or the offical vSAN troubleshooting reference manual (great document btw.).