Bulk or RAV Migration failure with "Error Creating Group"

Products

• VMware HCX

Issue/Introduction

• The initial Bulk Migration or RAV (Replicated Assisted vMotion) was initiated with "Enable Seed Checkpoint", but the migration failed during the base sync replication phase.
• The migration was re-initiated using the "existing seeds" option, which resulted in "Error Creating Group".
• Migration of another VM's works, which rules out the HCX-IX issue.
• The  /common/logs/admin/app.log of the target HCX Manager shows the following ERROR.

  <time stamp> [ReplicationTransferService_SvcThread-42023, Ent: HybridityAdmin, , TxId: TxId: #######-####-####-####-######] ERROR c.v.h.s.r.jobs.SetupTarget- Job (#######-####-####-####-#######) failed with exception java.lang.RuntimeException: Error Creating Group

Environment

VMware HCX

Cause

• The previous migration during the base sync phase failed, (due any network outage or space issue etc..), affecting the integrity of the target delta disks to be reused as seeds.
• The above error is due to incomplete or corrupted seed checkpoint delta disks on the target datastore that were left over from the initial failed migration.

Resolution

• Perform a migration job clean-up and remove the seed checkpoint disks from the target datastore.
  
  
• • Log in to the HCX Manager UI https://hcx-fqdn-ip
  • Go to the Migration Tab
  • Click on the Migration job and Force Cleanup
    
    

• • This deletes the delta disks replicated during the initial migration attempt.
  • Re-initiate the migration again with "Enable Seed Checkpoint"
    
    
• Note: When the job is reinitiated after the deletion of delta seed disks on the target, the base sync starts from the beginning.