Unable to migrate DB vm from NFS datatsore to vSAN datatsore

Products

• VMware vSAN 8.x

Issue/Introduction

• Migration of DB VM from NFS datastore to vSAN datastore fails with the error A "File not found"
  
  
• In the datastore VM folder, all the files are available

Environment

VMware vSAN 8.x

Cause

• The migration failure may be caused by descriptor file inconsistency and pointer chain fragmentation.
  
  
• Significant Read IO performance hits are indicated in the logs, attributed to the presence of multi-level snapshots.
  
  YYYY-MM-DDTHH:MM:SS: [vmfsCorrelator] 11746190317250us: [esx. audit. vmfs. sesparse.bloomfilter.disabled] Read IO performance maybe impacted for disk vm_name-flat. vmdk: Multi level snapshots
YYYY-MM-DDTHH:MM:SS: [vmfsCorrelator] 11746190732357us: [esx. audit. vmfs. sesparse.bloomfilter. disabled] Read IO performance maybe impacted for disk vm_name3-flat.vmdk: Multi level snapshots

Resolution

• To resolve the underlying disk inconsistencies and proceed with the move to vSAN datastore, perform the following:
  
  

  1. Run a "Delete All" snapshots task. This will merge the delta files into the base disks.

  2. Once consolidation is successful, re-initiate the migration to the vSAN datastore.