With VSAN6.1, Virtual SAN monitors solid state drive and magnetic disk drive health and proactively isolates unhealthy devices by unmounting them. This has happen to my home lab and wish to share how I recover the unmounted disks.
You can read more about this feature on http://cormachogan.com/2015/09/22/vsan-6-1-new-feature-problematic-disk-handling/
As you can see, the disks in one of my hosts are unmounted. I have tried to find a menu so I can remount the disks but could not find one. ...