vSAN adding disk fails

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I am trying to add a disk to vSAN and am getting the following error: 

Initialize disks in the vSAN cluster


A general system error occurred: Failed to reserve disk naa.5000cca03c6757dc with exception: Failed to write vSAN intent log Failed to write partition


On the ESXi host, I also get a status of ‘Normal, Degraded’ for the disk.  See attachments.


I have tried 2 different disks.  Any ideas?  Thanks

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