Migrating from Hybrid to All-Flash VSAN

I had this question twice last week and I went through the exercise in the lab so I figured I would share the experience. Migrating from Hybrid to All-Flash VSAN is pretty straight forward, and is pretty much an rolling migration. One thing I want to point out is that you need to do the full migration first before you enable any dataservices (dedupe/compression/raid-5/6). This is how you do it:

1. Open the vSphere Web Client.
2. Click the Hosts and Clusters tab.
3. Select the cluster which you want to migrate to all-flash Virtual SAN.
4. Click the Manage tab.
5. Click Settings.
6. Click Disk Management.
7. Select the first Disk Group and click the Remove Disk Group icon
8. Select Full data migration and click Yes
9. Remove the physical HDDs from the host
10. Add the new Flash devices to the host
11. Ensure there are no partitions on the flash devices
12. Ensure they are marked as flash devices
13. Now create a new Disk Group on this host by clicking the “Create a new disk group” button
14. Select the Caching Device
15. Select the Capacity Devices
16. Click OK

Repeat above steps for each host in the cluster. When finished upgrading all hosts in your cluster you can now enable your dataservices and/or change policies.