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Don't worry, enabling, or configuring HA will not affect the VMs (unless there's already a existing issue in your cluster).
The HA settings only come into play when powering on VMs (Admission Control), or in case of failures.
As a side note. For HA to work properly with the SC, there are a couple of settings which should be configured. In case you are interested, take a look at my reply at Re: Best Practices to configure a Standard vSwitch with three hosts and two physical switches.
Thank You for the feedback.
Based on your expertise on compellent devices, I have a couple of information to ask you.
Despite being installed on every node Vsphere 6.7, VMFS remained type 5.
This means that automatic unmap is not possible and that every two or three months an unmap must be done manually to reclaim the freed blocks.
Is there a method to update the filesystem without damaging the production VMs?
Or do I need to transfer the VMs to another storage first?
Thank You and Best Regards
You cant upgrade from VMFS 5.x to 6.x. You have to create a fresh Volume/Datastore and move the VMs around.
About your SC.... take a look to the Dell SC vSphere Best practices which you can find here: https://downloads.dell.com/manuals/common/sc-series-vmware-vsphere-best-practices_en-us.pdf
There are a few SC related adv. settings needed on ESXi and Cluster level.