HCX Bulk Migration Stuck at "Initial Sync 0%" for Virtual Machines with RDM Disks
Article ID: 417249
Updated On:
Products
Issue/Introduction
During an HCX Bulk Migration, virtual machines remain in the “Initial Sync 0%” state and do not progress beyond.
The following events may be observed:
- Replication group creation and configuration push steps are successfully completed on both source and destination HCX Interconnect (IX) appliances.
- Migration progress stalls at the step “Enabling replication on source VM” for very long time.
- Affected VM have physical Raw Device Mapping (RDM) disks attached.
Environment
HCX 4.11
Cause
This behavior occurs because HCX Bulk Migration has restrictions when handling virtual machines configured with RDMs.
- Physical Compatibility Mode (pRDM): Not supported for migration.
- Virtual Compatibility Mode (vRDM): Supported; however, these disks are converted to VMDKs at the destination during migration.
When VMs contain unsupported physical RDMs, HCX replication cannot initialize, resulting in the “Initial Sync 0%” stall.
Resolution
To migrate these VMs, consider one of the following options:
- Convert the RDMs to VMDKs using storage vMotion or
vmkfstools.
Refer to the KB article to know more about converting RDMs to VMDKs Converting a Raw Device Mapping (RDM) into virtual disk (VMDK)
To know more about vmkfstools command to convert RDM to VMDK, refer to the KB How to migrate a RDM backed disk to a new storage array
- Remove the RDMs before migration and reattach them manually post-migration.
Refer to the KB article to know more about removing/re-attaching the RDM disks Migrating virtual machines with Raw Device Mappings (RDMs)
Additional Information
For detailed information about HCX Bulk Migration restrictions, refer to the VMware HCX User Guide:
Understanding VMware HCX Bulk Migration
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