If you encounter a “Generic Failure” during vSAN disk group creation or if the disk group creation takes unusually long time and fails with weird errors under “Physical Disk” section in the automated vSAN Health Checks; usually, this is the sign of an underlying hardware issue.

Either the disk slot / disk cage / back-plane (or connectors / cables) or the disk itself (even if new) has some hardware issues that is preventing the creation of the disk group. This is especially true if other disk groups were created successfully on the same host.

You could try creating the disk group by eliminating suspect disks and usually this would succeed if it is a disk slot / disk issue. To identify the suspect disk, you could observe if vSAN partitions have been made to the disk and if one of the disks don’t have it; usually, that is the one you should eliminate and try.

Hope this helps.

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