Dell Unity™ Family VNX® Series Data Import to Unity All Flash or Hybrid, or UnityVSA™ System User Guide

Target provisioning

The following is the sequence of provisioning of the NAS server and file systems (thin file systems) in the target system:

1. The import session is validated to be initialized and all parameters are set correctly.
2. The target NAS server is created in import target mode with the correct name.
3. The target file system or file systems are created in import target mode with correct names that exactly match the source mount path.
4. The quota information is dumped from the source file system or file systems to the matching target file system or file systems. If the file system is imported as a VMware NFS data store on Unity, quotas import dumping is skipped.
5. A private server is set up for data transfer from the source NFS server to the target SP. The source VDM exports are updated to include the target import IP address at the file system root directory.
6. The file system level import session between source side file system and the target side file system are created and started.
7. The auto-retry mechanism is started.

Initial copy

Once the import target NAS server and file systems are provisioned, the initial copy job creates and starts the file system level import sessions for the initial data copy between the source and target file systems. Initial copy does not enter the Configuration Import stage until all file systems are migrated.

Configuration import

The initial copy job task continuously runs while waiting for the completion of the baseline copy. Once the baseline copy is complete, it stops the auto-retry mechanism and starts the configuration import (configuration import task). The VDM configuration that is imported ensures that the NAS server on the target system works correctly. The VDM configuration includes:

• NFS export
• Network interface
• Route configuration
• IP reflect parameter
• DNS configuration
• Local file
• LDAP configuration
• NIS configuration
• UNIX Directory Service setting
• Quota configuration

Once the configuration import completes, the initial copy job prepares for cutover to reduce the overall time and the DU time for cutting over. After the configuration import completes, the file import session enters the Ready to Cutover state. If import failed during initial copy, the configuration import is not rolled back. You can resume the import operation after fixing the reported issues, and import start can continue from the last point when it failed.