Failed to enter maintenance mode in the current VSAN data migration mode

By | July 12, 2017

I have a 3-node hybrid VSAN cluster with 600gb HDD capacity drives that I wanted to replace with 1200gb HDDs.

The steps that I planned to take (with guidance from support):

  1. Put host in maintenance mode (ensure availability)
  2. Delete diskgroup on host
  3. Replace disks
  4. Recreate diskgroup
  5. Let hosts resync
  6. Repeat

Things seemed to be going good until I hit steps 5, the resync was too fast or basically non-existent. I then tried to go to the next host and I got the error:

“Failed to enter maintenance mode in the current VSAN data migration mode due to insufficient nodes or disks in the cluster”

After working with support I found that diskgroup was disk format version 3 while the other were version 2 (I’ve been meaning to upgrade but wanted more capacity first). You can see the current Disk Format Version in (cluster name) -> Manage -> Settings -> Disk Management, Disk Groups, scroll to right.

The resolution is to set the maximum disk format version on all of the hosts to v2 and then re-build the diskgroup in question.

Here is the KB

You can monitor resync from the web-client (cluster name) -> Monitor -> Virtual SAN -> Resyncing Components or from RVC (cd to cluster) vsan.resync_dashboard

 

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