I had a few questions about this, so I figured I would record a quick demo showing Site Maintenance. In the demo, I have a stretched cluster configured in vSAN 9.0, and I am going to place the Preferred Site into maintenance mode. First a pre-check will occur to verify all workloads are replicated between locations, and then the site is placed into maintenance while maintaining data consistency across hosts. Next demo I will record will show the Manual Site Takeover command that was also introduced in 9.0 for OSA, but will be also available soon for ESA.
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